All All Tools
418 free all tools, no registration or login required, ready to use
📦 About All
Tool House provides a comprehensive collection of free online tools covering time calculation, image processing, text editing, data query, encryption and decryption, and many other fields. All tools are free to use without registration or login, ready to go whenever you need them — your reliable assistant for daily work and study.
Online Stopwatch
Precise timing, record time points, supports full-screen mode and data export
Analog Clock
Analog clock, supports automatic setup, can simulate exam room clock
Digital Clock
Real-time display of current time, supports flip animation, supports multiple themes
Countdown
Custom target time, real-time countdown reminder
Global Time
View real-time time across global time zones
Ba Zi (Four Pillars of Destiny)
Generate Ba Zi based on birth date
Countdown Days
Countdown days web version
Pomodoro Technique
Time management tool alternating focus and rest
Today's Plan
Quickly create and manage daily to-do items
Timestamp Converter
Convert time to timestamp and timestamp to time in different time zones
Global Time Zone Converter
Convert time zones online
Time Offset Calculator
Calculate time offsets online
Working Day Calculator
Calculate working days and paid days for any period in 2026 online for free, accurately handling holidays, compensatory workdays, and weekends
Today's Tasks
Minimalist daily task manager
Perpetual Calendar
Minimalist perpetual calendar
Twenty-Eight Mansions
Explore the wisdom of ancient Chinese constellations and interpret traditional culture
Gregorian-Lunar Calendar Converter
Supports Gregorian and lunar calendar conversion, solar term and festival lookup, zodiac and constellation, heavenly stems and earthly branches, and traditional almanac information
Time Zone Converter
Get current time zone instantly and convert
Shelf Life Calculator · Expiration Date Estimator
Enter production date/expiration date and shelf life duration to automatically calculate expiry date and remaining days, supporting day/month/year units
Lunar Mansion Relationship Calculator
Based on the Xiuyao Sutra · 27 Mansions System · In-depth fate analysis
Age Calculator
Supports both Gregorian and lunar calendar modes: accurately calculate chronological age (years/months/days), nominal age, days/months lived, birth weekday, zodiac sign, constellation, and next birthday countdown.
Blue Hour Calculator
Accurately calculate blue hour times before sunrise and after sunset based on solar elevation angle
Chinese Double Hour Calculator
Enter any time to automatically match the corresponding ancient Chinese double hour (Zi, Chou, Yin, Mao, etc.), displaying alternate names, five elements attributes, and historical origins
Week Number Calculator
Accurately calculate the week number of any date within the year, supporting custom start-of-week rules (Monday/Sunday)
Day-Night Calculator (Ancient Chinese Time Periods)
Bidirectional conversion between modern time and ancient five-watch time periods, accurately calculating watches and double hours, with educational content on traditional Chinese timekeeping culture
Pengzu Taboo Calendar
Convert Gregorian dates to heavenly stems and earthly branches, Pengzu daily taboos and recommendations, almanac hourly reference, including daily stem taboos and twelve double-hour traditional folk customs
Solar Elevation Angle Calculator
Accurately calculate the sun position (elevation angle, azimuth angle) at any moment based on solar altitude, display sunrise/sunset/noon times, supporting location queries for provinces, cities, and counties nationwide
Light Year Converter
Bidirectional precise conversion between light years and kilometers, meters, astronomical units, parsecs, and miles. Learn how many kilometers are in a light year and see cosmic distance references
Baby Days Calculator
Accurately calculate your baby's age in days, weeks, and months, display growth stages and milestone countdowns, helping parents record every day of their baby's growth
Solar Terms Calendar · 24 Solar Terms Almanac
Supports monthly solar term queries: today's solar term, this month's solar terms, next solar term preview, with detailed meanings, climate characteristics, and traditional customs
Sanfu & Shujiu Calculator · Traditional Seasonal Calendar
Accurately calculate the start and end dates of Sanfu (hottest days) and the number of Sanfu days, query start/end dates and period details of Shujiu (nine cold periods), with traditional wellness tips
Benmingnian Calculator · Chinese Zodiac · Traditional Customs · Next Benmingnian Countdown
Accurately calculate your zodiac sign, Benmingnian years, and remaining days until your next Benmingnian, with explanations of traditional customs, all calculations performed locally for privacy protection
Dao Calendar Online Lookup
Free online lookup of Daoist calendar holidays, sexagenary year records, Sanyuan, Wula, Bajie, Bahui, Wu days, Tian She days, and other important dates. Daoist year calculation and festival overview, supporting Gregorian and lunar calendar comparison.
Buddhist Calendar Online Lookup
Free online lookup of Buddhist calendar holidays, Ten Fasting Days, Six Fasting Days, Guanyin Fasting, New/Full Moon Fasting, Four Heavenly Kings Patrol Days, Buddha and Bodhisattva birthdays, and other important dates. Buddhist year calculation, fasting day lookup, and festival overview, supporting Gregorian and lunar calendar comparison.
Microphone Test
Quickly test if your microphone is working online
Camera Test
Quickly test if your camera is working online
Speaker Test
Quickly test if your speakers are working online
Keyboard Test
Quickly test if your keyboard is working online
IP Lookup
Look up IP information online
Mouse Sensitivity Converter
Convert sensitivity between popular games online
eDPI Calculator
Accurate mouse sensitivity calculation tool for all games
MAC Address Vendor Lookup
Look up the vendor of a MAC address online
Perfect Sensitivity Approximation Calculator
Find your exclusive FPS game sensitivity through 7 rounds of iteration
Online Ambient Noise Test Tool
Free online decibel detection tool, measure ambient noise level in real time, no installation required, local processing protects privacy
Mouse Scroll Test - Online Scroll Sensitivity & Performance Detection Tool
Professional online mouse scroll test tool, accurately measures scroll sensitivity, smoothness and direction recognition accuracy...
Mouse Polling Rate Test - Online Polling Rate Checker
Professional online mouse polling rate test tool, accurately measures mouse polling rate...
Online Screen Test - Professional Monitor Dead Pixel, Backlight Bleed & Color Test Tool
Professional online screen test tool, supports dead pixel detection, backlight bleed test, color gradient...
m3u8 Downloader
Parse and download m3u8 format videos
m3u8 Player
Play m3u8 format video files online
mpd Player
Play mpd format video files online
mp4 Player
Play mp4 videos online
Torrent to Magnet
Convert torrent to magnet link online
LRC & SRT Subtitle Converter
Bidirectional conversion between LRC and SRT, timeline adjustment, local processing for security
SRT to TXT Converter
Free online tool to convert SRT files to plain text TXT, with file preview and encoding options, secure local processing
SRT Subtitle Fixer
Free online SRT subtitle repair tool, supports sequence renumbering, timestamp protection, HTML tag removal, blank line deletion, and intelligent subtitle format fixing, secure local processing
VTT & SRT Subtitle Converter
Free online tool to convert between WebVTT and SRT subtitle formats, supports bidirectional conversion, secure local processing
Blood Pressure Normal Range Calculator · Age & Gender Stratified
Enter age, gender, systolic pressure (high) and diastolic pressure (low) to get real-time blood pressure health assessment based on age and gender
Ancient Five Elements Sound Meditation
Five elements sound guidance to assist meditation and relaxation
Scientific Sleep Calculator
Calculate optimal sleep/wake times based on your daily routine
Blood Type Calculator
Calculate possible blood types for children based on parents' blood types
Eyelid Twitch Omen Query
Check traditional beliefs about eyelid twitching at different hours
BMI Calculator
Calculate Body Mass Index
BMR Calculator
Basal Metabolic Rate Calculator
Schulte Grid
Free attention training tool
Body Fat Percentage Calculator
Free online body fat percentage calculator
Ideal Body Weight Calculator
Free online ideal body weight calculator
Pace Calculator
Free online running pace calculation
Life Number Calculator
Pythagorean life number interpretation
Maternity Leave Calculator
Calculate maternity leave days for all provinces in China
Lu Ban Ruler Calculator
Standard 46.08cm Lu Ban Ruler, query good or bad luck, convert door size units
Pace Calculator · Online Running Pace Tool | Convert Distance, Time and Speed
Free online pace calculator. Calculate the third value automatically by entering any two of distance, time and pace. Support running pace planning.
Protein Calculator · Daily Protein Intake Calculator
Calculate daily protein requirements scientifically based on weight, activity level and fitness goals, including minimum, standard and muscle gain recommendations.
Protein Requirement Calculator · Daily Protein Intake Online Tool | Fitness Nutrition Tool
Calculate daily protein requirements based on weight and activity level, with recommended ranges and food equivalent conversion.
Macronutrient Calculator · Daily Protein, Carb & Fat Intake Calculator | Scientific Nutrition Ratio Tool
Customize the ratio of protein, carbohydrates and fat based on weight and total calories, and accurately calculate daily intake of three major macronutrients.
Macronutrient Calculator · Daily Protein, Carb & Fat Intake Calculation
Calculate daily intake of protein, carbohydrates and fat according to weight and goals, supporting fat loss, maintenance and muscle gain modes.
Army Body Fat Calculator · US Army Standard Body Fat Percentage Tester
Body fat calculator based on US military formula. Evaluate physical fitness quickly with body measurements, support male and female modes.
Calorie Calculator · Daily Energy Requirement Calculator | BMR & TDEE Online Calculation
Free calorie calculator. Compute BMR and TDEE based on Mifflin-St Jeor formula to assess daily calorie demand scientifically.
Calorie Burn Calculator · Online Exercise Calorie Counter | Fitness & Weight Loss Analysis Tool
Free calorie burn calculator. Estimate calorie consumption accurately by weight, duration and exercise type, support 8 common sports.
Ideal Weight Calculator · Online Scientific Weight Assessment | Multi-formula Comprehensive Calculator
Free ideal weight calculator. Adopt BMI standard range method, Broca formula and Devine formula for comprehensive assessment, support gender-based calculation.
Height Calculator · Online Adult Height Prediction & Height Unit Converter for Kids
Predict children's adult height based on genetic formula, support two-way conversion between centimeters and feet/inches.
Height Converter · Online Centimeter to Feet & Inches Converter | Metric & Imperial Height Conversion Tool
Free online height converter for two-way conversion between centimeters and feet/inches, accurate to one decimal place. Suitable for international travel and clothing size matching.
Body Type Calculator · Online BMI & Body Classification Tool | Healthy Weight Assessment
Free body type calculator. Calculate BMI index and judge body type based on height and weight, with health suggestions provided.
BAC Calculator · Online Blood Alcohol Concentration Estimator | Drinking Safety & Health Assessment
Free online BAC calculator. Estimate blood alcohol concentration by gender, weight, alcohol intake and time, with status evaluation and safety tips.
BMI Calculator · Online Body Mass Index Tool | Healthy Weight Assessment & Classification
Free online BMI calculator with metric and imperial unit switching. Quickly calculate body mass index and evaluate weight classification.
BMR Calculator · Basal Metabolic Rate Calculator | Daily Energy Consumption Estimation Tool
Free online BMR calculator. Estimate basal metabolic rate via Mifflin-St Jeor equation and provide reference for daily resting energy consumption.
TDEE Calculator · Total Daily Energy Expenditure Calculator | Essential Tool for Fat Loss & Muscle Gain
Accurately calculate TDEE and BMR based on Mifflin-St Jeor formula, offer calorie suggestions for fat loss and muscle gain to manage weight scientifically.
Growth Standard Query Tool for Children Under 7 | Online Growth & Development Evaluator
Refer to national health standard WS/T 423-2022 to query median reference values of height, weight, BMI and head circumference for children under 7. Support boys and girls, cover 0-83 months to assess children's growth scientifically.
Water Intake Calculator · How Much Water Should You Drink A Day
Calculate the optimal daily water intake in milliliters online.
ASCII Converter · Online Character Encoding Tool | Text & ASCII Mutual Conversion
Free online ASCII converter, bidirectional conversion between characters and ASCII codes, also displays binary and hexadecimal encoding.
Base Converter
Supports quick conversion between bases 2-36
Animal Age Calculator
Convert equivalent ages between common animals and humans
File/String to MD5
Calculate MD5 of files and strings online
Color Wheel
Online color palette / color wheel
Base32 Encode/Decode Tool
Free online Base32 encoder/decoder, supports text to Base32 mutual conversion, provides standard Base32 encoding/decoding functions, simple and efficient
Caesar Cipher Encrypt/Decrypt Tool
Enter text and shift amount to quickly encrypt/decrypt Caesar cipher, supports custom shift, clearly displays encryption/decryption results
Pigpen Cipher Encrypt and Decrypt
Enter text to quickly encrypt/decrypt Pigpen cipher, visually displays the mapping between characters and Pigpen symbols, clearly presents encryption/decryption results
Rail Fence Cipher Encrypt and Decrypt
Enter text and number of rails to quickly encrypt/decrypt Rail Fence cipher, supports custom rail count, clearly displays encryption/decryption results
Online Base91 Encode/Decode
Enter text or Base91 encoded string to quickly encode/decode Base91, real-time display of encode/decode results, supports batch processing
Online Base92 Encode/Decode
Enter text or Base92 encoded string to quickly encode/decode Base92, real-time display of encode/decode results, supports batch processing
Online DES Encrypt/Decrypt
Enter text, key and encryption mode to quickly encrypt/decrypt DES, supports custom key and mode, clearly displays encryption/decryption results
Base64 Encode/Decode Tool
Supports mutual conversion between string/file and Base64
Bacon Cipher Encrypt/Decrypt Tool
Complete Bacon cipher encryption and decryption online
RSA Key Generator / Encrypt & Decrypt
Generate RSA public/private keys online, plus encryption and decryption
CRC32 Checksum Tool
Calculate and verify CRC32 checksum online
Vigenère Cipher Translator
Complete Vigenère cipher encryption and decryption online
Morse Code Tool
Encode and decode Morse code online
JWT Tool
Complete JWT decoding, signature verification and JWT generation online
Base58 Encode/Decode Tool
Complete Base58 encoding and decoding online
Base62 Encode/Decode Tool
Complete Base62 encoding and decoding online
SHA Series Encryption Tool
Complete SHA1, SHA224, SHA256, SHA384 encryption online
PX to RPX Converter
Quick conversion between PX and RPX units online
Color Value Converter
Convert RGB to HEX, RGBA, HSL color values online
Lat/Lng DMS Converter
Mutual conversion between decimal degrees and degrees/minutes/seconds format online
Storage Unit Converter
Convert between bytes, KB, MB, GB and other storage units online
Area Unit Converter
Convert between square meters, hectares, acres and other area units online
Hex to String Converter
Convert hexadecimal values to strings online
Random Password Generator
Generate passwords for various scenarios
Random Number Generator
Generate random numbers online
Retirement Age Calculator
Accurately calculate retirement year | Query legal retirement age for male and female employees
RGB to Hex Converter
Convert between RGB and hexadecimal color codes online with real-time color preview
RGB to HSV Converter
Quick mutual conversion between RGB and HSV color spaces online
Seal Maker
Create circular seals online
Text to SVG
Convert text to SVG online
HEIC Converter | Preview
Support HEIC online preview and conversion to other image formats
QR Code Parser & Generator
Parse QR codes / Generate QR codes
EXIF Info Viewer
View EXIF metadata information
JFIF Format Converter
Convert JFIF to other image formats
ICO Converter
Convert ICO to other image formats
WEBP Converter
Convert WEBP to other image formats
AVIF Preview | Converter
Convert AVIF format to other image formats
Online Image Compressor
Support online compression for common formats
Image Merge
Merge images with various templates
Image to GIF
Free online image to GIF converter
9-grid Image Splitter
Free online 9-grid image cutter
Image Color Invert
Invert the colors of images
Online Handwritten Signature
Create digital handwritten signatures online. Adjust stroke size and color, and download as transparent PNG files
ASCII Art Generator
Free online ASCII art generator. Convert photos to ASCII art in one click. Adjust brightness, contrast and color inversion. Copy text or download files. Ideal for social sharing, creative art and code comments
Barcode Generator
Totally free with no registration required. Generate 14+ barcode formats including CODE128, EAN-13, UPC and Pharmacode, and download as PNG
WeChat Chat Record Generator
Customize chat interfaces freely, export high-definition screenshots with one click. Local use for entertainment and full data security
Online Word Cloud Maker
Free word cloud generator to create personalized word cloud images in one click
PNG Image Compressor
Compress PNG images
GIF Image Compressor
Compress GIF images
BMP Image Compressor
Compress BMP images
SVG Compressor
Compress SVG files
TIFF Image Compressor
Compress TIFF images
WEBP Image Compressor
Compress WEBP images
HEIC Image Compressor
Compress HEIC images
JPEG Image Compressor
Compress JPEG images
Md to PDF | Word
Quickly convert Markdown to PDF or Word
File Rename
Support batch file renaming
File Compression
Support compression and decompression of zip, tar, gz formats
Excel File Online Compression
Support online Excel file compression
PPT File Online Compression
Support online PPT file compression
Word File Online Compression
Support online Word file compression
TAR File Archiver
Support TAR file packaging
ZIP File Archiver
Support ZIP file packaging
PDF File Compression
Support PDF file compression
EPUB File Compression
Support EPUB file compression
Audio Cutter
Professional online audio trimmer
Text to Chinese Speech
Online Chinese text-to-speech reader
Text to Taiwanese Speech
Online Taiwanese text-to-speech reader
Text to Cantonese Speech
Online Cantonese text-to-speech reader
Piano
Online piano
Chinese to Pinyin Converter
Free online tool to convert Chinese characters to Pinyin. Supports multiple Pinyin formats and pronunciation audio. An essential tool for learning Mandarin.
Chinese to Cantonese Pinyin Converter
Free online tool to convert Chinese characters to Cantonese Pinyin. Supports Cantonese pronunciation audio. An essential tool for learning Cantonese.
Simplified-Traditional Chinese Converter
Online tool for converting between Simplified and Traditional Chinese.
Chinese to Pinyin
Online Chinese character to Pinyin conversion tool.
Numbers to Chinese Uppercase
Convert numeric amounts to Chinese uppercase format.
Invoice Date to Chinese Uppercase
Convert invoice dates to Chinese uppercase format.
Special Symbols Quick Lookup
Quickly look up special symbols.
Fancy Text Generator
Generate stylish English text online.
English Case Converter
Various English case conversions online.
Word Counter
Over a dozen statistical dimensions.
Online Text Diff Checker - File & Code Compare Tool
Free online text comparison tool supporting real-time side-by-side diff, line-by-line comparison, and code difference checking. Automatically highlights additions, deletions, and modifications for precise text difference detection.
Fullwidth Halfwidth Converter
Convert character width formats. Supports English letters, numbers, punctuation, and Japanese kana.
Chinese Character Converter (Traditional/Simplified)
Built with opencc-js for secure local processing
Arrow Symbols Collection
Includes hundreds of common and special arrow symbols, clearly categorized, one-click copy
Emoji Query Tool
Online Emoji information lookup
Excel Shortcut Query Tool
Covers all versions of Excel 2016/2019/365, with 92 high-frequency shortcuts categorized by scenario, boosting spreadsheet efficiency
Mac Shortcut Query Tool
Covers all Mac chipsets Intel/M1/M2, with 92 high-frequency shortcuts categorized by scenario, boosting operational efficiency
Windows Shortcut Query Tool
Covers all versions of Windows 10/11, with 78 high-frequency shortcuts categorized by scenario, boosting operational efficiency
Sunrise & Sunset
Sunrise and sunset time lookup
I Ching 64 Hexagrams Query Tool
Explore the wisdom of the I Ching's 64 hexagrams, query hexagram images, line statements, hexagram statements, and commentary details
Geographic Elevation Lookup
Get the current location's elevation and latitude/longitude information
Current Location Sunrise, Sunset & Moon Info
Real-time precise sunrise/sunset times, moon information, and astronomical data for your location
Global Phone Number Generator
Supports phone number formats for 200+ countries/regions, customizable quantity for batch generation, suitable for testing, development, and demos
MAC Address Generator
Randomly generates MAC addresses based on manufacturer rules
Paper Size Reference Table
Query common paper specification sizes, units, and applicable scenarios, including international standards and traditional Chinese folio sizes
ID Card Information Query
Online parsing of Chinese citizen ID numbers, query address code, date of birth, gender, and check digit, verify ID card authenticity
Punctuation Symbols Collection
Includes hundreds of common Chinese punctuation, English punctuation, and special symbols, clearly categorized, one-click copy
Currency Symbols Collection
Includes 150+ legal tender symbols and cryptocurrency symbols from around the world, covering major currencies, Asian currencies, European currencies, American currencies, African currencies, Middle Eastern currencies, etc., clearly categorized, one-click copy
Circle Symbols Collection
Includes 140+ circle symbols in eight categories, including geometric shapes, mathematical symbols, Emoji dots, circled numbers/letters, circled Chinese characters, astrological symbols, special marks, Japanese/Korean miscellany, etc., clearly categorized, one-click copy
Mathematical Symbols Collection
Includes 300+ mathematical symbols covering ten major categories: operators, geometric symbols, set theory, logic symbols, calculus, Greek letters, number theory/combinatorics, linear algebra, probability & statistics, etc., clearly categorized, one-click copy
Chinese Telegraph Code Query
Includes standard Chinese telegraph codes for 9000+ Chinese characters based on the 1983 'Standard Telegraph Codebook (Revised Edition)', supports bidirectional query between Chinese characters and four-digit numeric codes, one-click copy of results
Flower Language Query Tool
Includes flower language meanings for 200+ common flowers such as roses, lilies, sunflowers, etc., supports bidirectional search by flower name/meaning, flower card browsing with detailed introductions
ASCII Code Reference Table
Complete standard ASCII encoding reference table, supports decimal, octal, hexadecimal, and binary queries, includes HTML entity encoding reference, a practical tool for programming development and data communication
Chinese Historical Dynasties Timeline
Complete Chinese historical dynasties timeline with AD years, capitals, and founding emperors. Includes dynasty mnemonic rhyme, presenting 5,000 years of historical context from Xia-Shang-Zhou to Ming-Qing, supports ancient-modern place name comparison and multi-ethnic regime reference
RGB Color Reference Table
Comprehensive RGB color code query reference table, provides RGB values and hex color codes for hundreds of common colors, supports quick search by color name, RGB value, or HEX code, suitable for web design, frontend development, and UI color matching scenarios
Chinese Surnames Query Tool
Online query of the Hundred Family Surnames information
Length Unit Converter
Precision conversion between international, Chinese customary, imperial/US customary, and engineering length units
Binary to Decimal Converter
Professional online tool for converting binary fractions to decimal. Supports integer + fractional binary to decimal conversion, automatic binary format validation, detailed conversion steps and calculation process, customizable result precision
Area Unit Converter
Real-time conversion between common area units including square meters, hectares, square kilometers, square feet, etc.
Meters to Feet Converter · Online Length Unit Conversion Tool
Free online meters to feet converter supporting two-way precise conversion between meters, feet, and inches. Uses international standard conversion factor 1 meter = 3.28084 feet. Results retain multiple decimal places, suitable for travel, height measurement, architectural design, sports data, and other length conversion needs.
System of Linear Equations in Two Variables Calculator
Solve systems of linear equations in two variables online
Permutation and Combination Calculator
Calculate permutations and combinations online
Factorization Calculator
Calculate factorization online
Factorial Calculator
Calculate factorials online
Fraction Calculator
Calculate fractions online
Function Graph Generator
Generate function graphs by entering a function
Greatest Common Divisor Calculator
Calculate the greatest common divisor online
Least Common Multiple Calculator
Calculate the least common multiple online
Linear Equation in One Variable Calculator
Solve linear equations in one variable online
Quadratic Equation Calculator
Solve quadratic equations online
Percentage Change Calculator
Calculate growth rate and rate of change online
Percentage Difference Calculator
Calculate the percentage difference between two values
Percentage Calculator
Quickly calculate percentage values, results after percentage increase/decrease
Percentage Decrease Calculator
Calculate the result after reducing a value by a specific percentage, automatically compute decrease amount and final value
Percentage Increase Calculator
Calculate the result after increasing the original value by a specified percentage, automatically compute increase amount and final value
Percentage Growth Calculator
Calculate the growth amount and growth rate from the original value to the new value, automatically determine growth/decrease type and provide detailed calculation steps
Percentage to Fraction Calculator
Quickly convert percentages to simplified fractions and decimals, supports integer and decimal percentages (e.g., 37.5%), automatic reduction of numerator and denominator, displays detailed conversion steps
Ratio Calculator
Quickly calculate the ratio relationship between two numbers, automatically find the greatest common divisor to obtain the simplest integer ratio, supports integers and decimals, provides precise ratio and detailed calculation steps
Standard Deviation Calculator
Quickly calculate standard deviation, mean, and variance of a data set to measure data dispersion. Supports sample standard deviation and population standard deviation, suitable for statistical analysis, quality control, and investment risk assessment
Standard Form Calculator
Quickly convert any number to standard form, scientific notation, and engineering notation. Supports regular numbers and e-notation input, provides detailed conversion results and comparison of three notation types
Tank Volume Calculator
Quickly calculate the total volume of cylindrical, spherical, and rectangular tanks, automatically convert between cubic meters, liters, and gallons. Suitable for oil tank, water tank, chemical container volume estimation scenarios
Derivative Calculator
Calculate the derivative value of a function at a point using numerical methods, supports precise derivative calculation of power functions, trigonometric functions, exponential functions, and logarithmic functions, provides function value and derivative value results, with derivative rule explanations
Reciprocal Calculator
Quickly calculate the reciprocal (mathematical reciprocal) of any non-zero number, supports positive and negative numbers, integers and decimals, provides product verification function and detailed calculation steps, helps understand the mathematical properties of reciprocals
Equivalent Fractions Calculator
Quickly calculate equivalent forms of fractions, supports positive and negative fractions, mixed numbers, integers, proper fractions, and improper fractions. Provides decimal representation and other multiple equivalent fraction lists to help understand fraction ratio relationships and common denominator/reduction principles
Harmonic Mean Calculator
Quickly calculate the harmonic mean of a group of positive numbers, commonly used for average speed, parallel resistance, average ratio, and other scenarios. Supports comma-separated input, automatically filters invalid data, provides detailed calculation steps and formula explanations
Kinetic Energy Calculator
Quickly calculate kinetic energy, mass, or velocity using the kinetic energy formula KE = ½mv². Supports three calculation modes, provides detailed calculation steps and physics principle analysis, suitable for physics teaching, engineering mechanics, motion analysis, and other scenarios
Logarithm Calculator
Quickly calculate common logarithm (base 10), natural logarithm (base e), and logarithm with any positive base. Supports custom base, results accurate to 10 decimal places, provides detailed calculation steps and logarithm property explanations, suitable for mathematics, science, engineering, and financial calculations
Quadratic Equation Calculator
Solve quadratic equations ax² + bx + c = 0 online, supports real and complex roots, automatically calculates discriminant Δ and provides detailed solution steps. Suitable for math learning, physics problems, engineering design, financial analysis, and other scenarios
Fraction Addition Calculator
Online fraction addition and subtraction calculator, supports adding or subtracting multiple fractions, automatically finds common denominators, reduces fractions, and provides decimal results. Suitable for students learning math, cooking recipe adjustments, woodworking measurements, financial ratio calculations, and other scenarios
Binary Calculator
Online binary calculator, supports binary and decimal conversion, binary addition, subtraction, multiplication, and division operations. Provides detailed calculation steps and result analysis, suitable for programming learning, network configuration, computer organization principles, bitwise operation optimization, and other scenarios
Inverse Trigonometric Function Calculator
Calculate arcsine (arcsin), arccosine (arccos), and arctangent (arctan) online, supports degree (°) and radian (rad) units, accurate to 10 decimal places. Suitable for mathematical solving, physics vector analysis, engineering drawing, game development, robot inverse kinematics, and other scenarios
Variance Calculator
Calculate sample/population variance, standard deviation, and coefficient of variation online, supports comma-separated numbers. Suitable for data analysis, risk assessment, quality control, and other scenarios
Fraction Calculator
Online fraction addition, subtraction, multiplication, and division tool, supports four arithmetic operations on fractions, automatically reduces to simplest fraction and converts to decimal. Supports positive and negative fractions, mixed number conversion, provides detailed calculation process and simplest fraction display, suitable for math learning, homework verification, daily life ratio calculation, and other scenarios
Fraction to Percent Calculator
Online fraction to percentage calculator, quickly converts fractions to percentages and decimals. Supports proper fractions, improper fractions, mixed number conversion, automatically determines fraction type and provides reduction tips. Suitable for math learning, data analysis, business calculations, exam score statistics, and other scenarios, provides detailed calculation steps and precise results
Fraction to Decimal Calculator
Online fraction to decimal tool, quickly converts fractions to decimals and percentages, supports custom decimal places, automatic rounding, provides detailed calculation steps. Supports positive and negative fractions, improper fractions, zero numerator scenarios, suitable for student homework, financial analysis, cooking recipe adjustments, engineering ratio calculations, and other scenarios
Complex Number Calculator
Online complex number addition, subtraction, multiplication, and division tool, supports four arithmetic operations on complex numbers, automatically calculates modulus and argument of results. Supports arbitrary real number inputs for real and imaginary parts, automatically handles signs, provides detailed complex number expressions and polar coordinate representation, suitable for circuit analysis, signal processing, automatic control, quantum mechanics, and other scenarios
Probability Calculator
Online permutation, combination, and probability calculation tool, supports permutation (P), combination (C), and classical probability calculations. Automatically calculates P(n,k), C(n,k), and event probability, provides detailed calculation steps and result explanations. Suitable for mathematical statistics, lottery analysis, game strategy, risk assessment, and other scenarios
Pythagorean Theorem Calculator
Free Pythagorean theorem calculator, quickly calculates right triangle side lengths based on a²+b²=c². Supports calculating hypotenuse from two legs or calculating one leg from hypotenuse and the other leg, provides detailed calculation steps and verification. Suitable for math learning, engineering design, architectural measurement, and other scenarios
Mixed Number Calculator
Free mixed number calculator, supports mixed number addition, subtraction, multiplication, and division operations. Automatically converts results to mixed number, improper fraction, and decimal forms for display, built-in fraction simplification function. Suitable for school homework, cooking measurement, woodworking calculation, and other scenarios
Concrete Calculator
Free concrete calculator, quickly calculates the amount of cement, sand, gravel, and water needed. Supports standard 1:2:3 mix ratio, provides detailed calculation steps and construction advice. Suitable for foundation, driveway, courtyard, and other engineering projects
Definite Integral Calculator
Free definite integral calculator, uses numerical integration methods to calculate precise values of definite integrals. Supports multiple function types such as power functions, trigonometric functions, exponential functions, provides detailed calculation steps and result analysis. Suitable for math learning, scientific research, engineering design, and other scenarios
Geometric Mean Calculator
Free geometric mean calculator, quickly calculates the geometric mean of a group of positive numbers. Suitable for average growth rate, investment return rate, data analysis, and other scenarios. Supports batch data input, automatically filters invalid data, provides detailed calculation steps and result interpretation
Simplify Fractions Calculator
Free simplify fractions calculator, supports reduction of proper and improper fractions, automatically converts to mixed number and decimal forms. Quickly calculates greatest common divisor, provides detailed simplification steps. Suitable for math learning, engineering calculation, financial analysis, and other scenarios
Factorial Calculator
Free online factorial calculator, quickly calculates the factorial of any integer from 0 to 20, provides detailed calculation steps and result display. Supports combinatorial mathematics, probability analysis, algorithm design, and other application scenarios
Matrix Calculator
Free matrix calculator, supports matrix addition, subtraction, and multiplication operations. Users can input matrices of arbitrary dimensions (e.g., 2x2, 3x3), automatically parse matrix format and verify dimension compatibility. Provides clear table result display and error prompts, suitable for linear algebra learning, engineering calculation, data transformation, and other scenarios. Supports Ctrl+Enter shortcut for quick calculation, with a beautiful and user-friendly interface
Matrix Operation Calculator 2
Free 2x2 matrix operation calculator, supports matrix addition, subtraction, and multiplication operations. Quickly calculates matrix sum, difference, and product, accurately processes real number matrices, suitable for linear algebra learning, engineering calculation, data science, and other scenarios. Real-time input yields instant results, simple and easy to use
Distance Formula Calculator (2D Plane)
Free distance formula calculator, quickly calculates the straight-line distance between two points on a 2D plane using the Euclidean distance formula √[(x₂-x₁)²+(y₂-y₁)²]. Supports decimal and negative coordinate input, real-time display of coordinate differences (Δx,Δy) and complete square and square root derivation process. Suitable for math learning, analytic geometry, game development, computer graphics, data science distance metrics, engineering measurement, and other scenarios. Provides precise calculation results, automatically handles large numbers and coincident point situations
Scientific Notation Converter
Online scientific notation conversion tool, converts numbers to scientific notation, e-notation, engineering notation, and standard form, automatically identifies order of magnitude. Supports fast format conversion of very large numbers and very small values
Scientific Calculator
Free online scientific calculator, supports basic operations, trigonometric functions (sin/cos/tan), inverse trigonometric functions, logarithmic functions (ln/log), exponential operations (e^x/x^y), square root, and other advanced math functions. Supports continuous input of complex expressions, one-click calculation, suitable for math learning, engineering calculation, physics analysis, and other scenarios
Scientific Notation Calculator · Online Scientific Notation Conversion Tool
Free scientific notation calculator, supports addition, subtraction, multiplication, and division operations, automatically converts results to scientific notation, e-notation, and standard form. Supports processing of very large and very small numbers, provides expression display and detailed operation steps. Suitable for research papers, engineering calculation, physics and chemistry, programming development, and other scenarios
Cube Root Calculator · Online Cube Root Calculator | Supports Negative Numbers and Decimals with Precise Calculation
Free cube root calculator, supports positive numbers, negative numbers, decimals, and zero, accurate to 4 decimal places, provides verification function, suitable for math learning, geometric volume calculation, engineering measurement, and other scenarios
Cubic Yard Calculator
Free online cubic yard calculator, supports mixed unit input of feet, yards, and meters, automatically converts to cubic yards, cubic feet, and cubic meters. Suitable for volume calculation in construction, landscaping, earthwork, and other scenarios
Roman Numeral Converter
Free online Roman numeral converter, supports bidirectional conversion between Arabic numerals 1-3999 and Roman numerals. Uses greedy algorithm and subtractive notation rule, instant conversion upon number input, provides comparison table and rule description
Density Calculator · Online Density Formula Calculation Tool | Mass Volume Density Conversion
Free online density calculator, quickly calculates substance density based on density formula ρ=m/V. Enter mass and volume to automatically get density value, provides detailed calculation steps and formula derivation. Suitable for physics experiment teaching, material identification analysis, engineering design calculation, logistics transportation loading, quality inspection evaluation, and other scenarios
Power Calculation Calculator
Free online power calculation calculator, supports positive integer, negative integer, and fractional exponent operations, quickly calculates powers of arbitrary bases. Also provides square root and natural logarithm values, helps understand the mathematical relationships of exponent operations. Suitable for math learning, scientific calculation, engineering application, financial modeling, data storage conversion, and geometric measurement scenarios
Area Calculator · Online Geometry Area Calculation | Support for Multiple Shape Area Formula Calculation
Free online area calculator, supports area calculation of common geometric shapes such as rectangle, square, circle, triangle, trapezoid, etc. Enter parameters to quickly obtain precise results, provides detailed area formula reference and calculation process
Permutation Combination Calculator · Online Permutation and Combination Calculator | Factorial and Binomial Coefficient Tool
Free online permutation combination calculator, quickly calculates permutation number P(n,k) and combination number C(n,k), built-in efficient factorial algorithm. Supports large number operations, provides detailed formula derivation steps. Suitable for probability statistics, math learning, lottery calculation, and other scenarios
Square Root Calculator · Online Root Calculation Tool | Mathematical Operation and Data Analysis
Free online square root calculator, quickly calculates the square root of any non-negative number. Provides precise calculation results, reverse verification, and cube values, supports integers and decimals. Suitable for math learning, engineering calculation, data analysis, and other scenarios as a practical root extraction tool
Square Feet Calculator · Online Area Conversion Tool | Square Feet to Square Meters Conversion
Online square feet calculator, quickly calculates rectangular area and automatically converts to square meters. Enter length and width to instantly get precise area values in both square feet and square meters, suitable for real estate, interior design, construction engineering, and other scenarios
Average Calculator · Online Arithmetic/Geometric/Harmonic Mean Calculator
Free online average calculator, supports arithmetic mean, geometric mean, and harmonic mean calculation. Enter a set of numbers to quickly obtain precise results, provides detailed calculation steps, suitable for statistical analysis, academic research, and daily data calculation scenarios
Mean Median Mode Range Calculator · Online Data Set Statistical Analysis Tool
Free online mean, median, mode, range calculator, supports comma-separated input, automatic sorting and calculation, provides detailed descriptive statistical analysis. Suitable for grade analysis, sales statistics, market research, and other scenarios
Modulo Calculator · Online Remainder Calculator | Division Remainder Operation Tool
Free online modulo calculator, quickly calculates the remainder of two numbers divided. Supports positive and negative numbers, decimals, and integers, automatically calculates quotient and remainder, provides complete verification formula. Suitable for math learning, programming debugging, time conversion, and daily calculation scenarios
Trigonometric Function Calculator · Online Sine Cosine Tangent Calculation | Angle Radian Conversion Tool
Free online trigonometric function calculator, supports six function calculations: sine, cosine, tangent, cotangent, secant, and cosecant. Supports degree and radian input units, provides high-precision calculation results. Suitable for math learning, physics calculation, engineering design, and other scenarios
Triangle Calculator · Online Geometry Calculation Tool | Side Length Angle Area One-Click Solution
Free triangle calculator, enter three side lengths to quickly calculate area, angles, perimeter, inscribed circle radius, circumscribed circle radius, and other geometric parameters. Based on Heron's formula and law of cosines, provides precise calculation results, suitable for math learning and engineering design
Hexadecimal Calculator · Online Hexadecimal Addition Subtraction Multiplication Division | Base Conversion Tool
Online hexadecimal calculator, supports hexadecimal addition, subtraction, multiplication, and division operations. Also provides decimal and binary result conversion, quickly and accurately performs hex mathematical calculations, suitable for programming development, memory address calculation, color code processing, and other scenarios
Math Equation Solver · PEMDAS Online Calculator | Solve Mathematical Expressions by Order of Operations
Free online math equation solver, strictly follows PEMDAS operation rules, supports priority calculation of parentheses, exponents, multiplication and division, addition and subtraction. Can process complex nested expressions, provides precise calculation results, suitable for student homework verification, daily calculation, and teaching demonstration
Number Generator · Online Random Number Generator | Custom Range and Sorting
Free online number generator, supports custom minimum and maximum value ranges, can specify generation quantity and choose ascending or descending order. Suitable for lottery, test data generation, classroom teaching, and other scenarios, pure front-end operation protects privacy
Rounding Calculator · Online Number Rounding Tool | Precise to Decimal Places and Significant Figures
Free online rounding calculator, supports three modes: decimal place rounding, significant figure rounding, and nearest value rounding. Quickly rounds numbers to the nearest tenth, hundredth, or thousandth, suitable for math operations, data analysis, and financial calculation scenarios
Speed Calculator · Online Velocity Calculation Tool | Distance Time Speed Conversion
Online speed calculator, quickly calculates speed based on distance and time, supports distance units such as kilometers, meters, miles, feet and time units such as hours, minutes, seconds. Automatically converts and displays three results: kilometers per hour, meters per second, miles per hour, suitable for driving speed measurement, sports pace, physics learning, and other scenarios
Arithmetic and Geometric Sequence Calculator · Online Sequence Generation and Summation Tool | Arithmetic Progression and Geometric Progression
Free online arithmetic and geometric sequence calculator, supports term value calculation and sum of first n terms for arithmetic and geometric sequences. Enter first term, common difference or common ratio, and number of terms to quickly generate complete sequences and display the nth term result, suitable for math learning, financial planning, and engineering analysis scenarios
Random Number Generator · Online Random Number Generation Tool | Lottery and Simulated Data Analysis
Online random number generator, quickly generates random integers within a specified range. Supports setting minimum, maximum, generation quantity, and can choose whether to allow duplicate numbers. Suitable for lottery activities, data simulation, game development, password generation, and other scenarios, all calculations completed locally in the browser
Taylor Series Calculator · Online Function Expansion and Approximation Tool | Maclaurin Series Approximation
Free Taylor series calculator, supports Maclaurin expansion of e^x, sin(x), cos(x), ln(1+x), customizes the number of terms to calculate approximate values, real-time comparison of exact value and error. Suitable for math learning, numerical calculation verification, and engineering approximation analysis scenarios
Volume Calculator · Online Geometry Volume Calculation Tool | Cube, Sphere, Cylinder Volume Formula
Free online volume calculator, supports volume calculation of geometric shapes such as cube, rectangular prism, cylinder, sphere, cone. Enter parameters to quickly obtain precise calculation results, with volume formula reference. Suitable for engineering, construction, learning, and other scenarios
Vector Calculator · Online Vector Operation Tool | Addition Subtraction Dot Product Cross Product Magnitude Calculation
Free online vector calculator, supports addition, subtraction, dot product, cross product, and magnitude calculation of 2D and 3D vectors. Enter vector components to get precise results, suitable for math learning, physics analysis, and engineering design, simple operation with intuitive results
Decimal to Percent Calculator · Online Number Percentage Conversion Tool | Fraction and Percentage Interconversion
Free decimal to percentage calculator, quickly converts decimals or integers to percentages and displays fraction form. Supports arbitrary precision numbers, automatic calculation, provides detailed conversion steps. Suitable for learning, finance, statistics, and other scenarios
Decimal to Fraction Calculator · Online Decimal to Fraction Tool | Precise Fraction Converter
Free decimal to fraction calculator, supports converting terminating decimals and repeating decimals to simplest fractions. Automatically reduces and displays detailed conversion steps to help understand the equivalence relationship between decimals and fractions. Suitable for math learning, engineering measurement, cooking recipes, and ratio calculation scenarios
Slope Calculator · Online Line Slope and Equation Solving Tool | Calculate Inclination Angle and Distance from Two Point Coordinates
Free online slope calculator, quickly calculates line slope, inclination angle, distance between two points, and line equation based on two point coordinates. Supports positive and negative slopes and decimal input, provides detailed calculation steps, suitable for math learning, engineering design, and data analysis scenarios
Sequence Calculator · Arithmetic and Geometric Sequence Online Calculation Tool
Online sequence calculator, supports calculation of the nth term and sum of first n terms for arithmetic and geometric sequences, automatically generates complete sequence display. Suitable for math learning, financial planning, engineering calculation, and other scenarios, simple operation with precise results
Prime Factorization Calculator · Online Prime Factor Decomposition Tool | Mathematical Calculation and Number Theory Analysis
Free online prime factorization calculator, quickly decomposes positive integers into products of prime factors. Displays exponential representation and number of prime factors, supports trial division step-by-step decomposition. Suitable for math learning, fraction reduction, number theory research, and programming algorithm practice scenarios
Significant Figures Calculator · Online Significant Digit Counting Tool | Scientific Notation and Numerical Analysis
Free online significant figures calculator, quickly counts the number of significant digits in a number. Supports integer, decimal, and scientific notation input, automatically identifies significant figures and displays detailed results. Suitable for scientific experiments, engineering calculations, and data analysis scenarios
Significant Figures Calculator · Online Significant Figure Identification and Rounding Tool | Scientific Notation and Data Analysis
Free online significant figures calculator, automatically identifies significant digits of a number and rounds to specified significant figures. Follows scientific significant figure rules, supports integer and decimal processing. Suitable for experimental data, engineering measurement, chemical calculation, and other scenarios, provides detailed calculation steps
Circle Calculator · Online Circle Area Circumference Diameter Calculation Tool
Free circle calculator, quickly calculates the diameter, circumference, and area of a circle based on the radius. Results accurate to four decimal places, displays detailed calculation steps. Suitable for math learning, engineering design, handicrafts, and other scenarios
Cylinder Volume Calculator · Online Cylinder Volume and Surface Area Calculation | Geometric Measurement Tool
Free cylinder volume calculator, quickly calculates the volume, lateral surface area, and total surface area of a cylinder. Enter base radius and height to get precise geometric calculation results, supports multiple decimal precision, suitable for engineering measurement, capacity calculation, teaching demonstration, and other scenarios
Online Percentage Calculator · Quickly Calculate Number Percentage | Discount Tax and Data Analysis Tool
Free online percentage calculator, quickly calculates percentage of a number, supports common scenarios such as discounts, taxes, tips. Enter the number and percentage to get the result and increased total value, provides detailed calculation steps
Long Division Calculator · Online Division with Remainder Operation | Step-by-Step Problem Solving Tool
Free long division calculator, performs division operations with remainder online, simultaneously displays quotient, remainder, decimal result, and mixed number form. Suitable for math learning, item distribution, and financial calculation scenarios
Feet and Inches Calculator · Online Imperial Length Conversion | Feet Inches to Centimeters Meters
Free online feet inches conversion tool, supports bidirectional real-time conversion between feet/inches and centimeters/meters. Easily solve imperial length unit conversion problems
Integer Calculator · Online Rounding Tool | Floor, Ceil, Round
Free online integer calculator, supports three rounding methods: floor, ceil, and round, suitable for financial calculation, data analysis, and other scenarios
Normal Distribution Calculator · Online Z-Score and Probability Query Tool
Free online normal distribution calculator, enter mean, standard deviation, and X value to calculate Z-score, cumulative probability, and central interval probability, essential for statistical analysis
Right Triangle Calculator · Pythagorean Theorem Online Solver | Side Angle Area One-Click Calculation
Online right triangle calculation tool based on the Pythagorean theorem, enter any two sides to solve the remaining side length, acute angle, and area, suitable for math learning and engineering design
Exponent Power Online Calculator - Base Power and Scientific Calculation Tool
Online exponent power calculator, supports power calculation of any base and exponent, analyzes the difference between power functions and exponential functions and scientific notation, helps you master exponent operations
Exponential Growth Calculator · Online Continuous Compound Interest, Population Growth and Decay Calculator
Free online exponential growth calculator, based on continuous compound interest formula A=P·e^(rt), supports scenarios such as compound interest, population prediction, radioactive decay, real-time calculation of final value and growth multiple
Prime Factorization Calculator · Online Prime Factor Decomposition | Free Math Tool
Free online prime factorization calculator, supports decomposing numbers into prime number products, provides exponential form and number of factors, uses trial division algorithm for fast and accurate results
Median Calculator · Online Median, Mean, and Mode Calculator | Statistics Tool
Free online median calculator, enter numbers to calculate median, mean, and mode, master data central tendency, suitable for academic research and data analysis
GCD Calculator · Online GCD Calculation Tool | Step-by-Step Common Divisor Solving
Free online greatest common divisor calculator, supports multi-number GCD solving, displays calculation steps and common divisor list. Based on Euclidean algorithm, suitable for fraction reduction and number theory learning
Greatest Common Divisor Calculator · Online GCD and LCM Calculation | Euclidean Algorithm
Free online greatest common divisor calculator, supports multiple positive integers for GCD and LCM calculation, uses Euclidean algorithm, suitable for fraction simplification and math teaching
LCM Calculator · Online Multiple Number LCM Calculator | Free Math Tool
Free online least common multiple calculator, supports batch input of multiple numbers, synchronously displays LCM and GCD results. Based on Euclidean algorithm, suitable for fraction common denominator, period calculation, and other scenarios
Least Common Denominator Calculator · Online LCD Calculation | Fraction Common Denominator Tool
Free online least common denominator calculator, supports batch input of denominators, uses Euclidean algorithm to quickly calculate LCD, suitable for fraction common denominator and addition/subtraction of fractions with different denominators
Nth Root Calculator · Online High-Precision Nth Root Extraction Tool
Free online nth root calculator, supports calculating any positive integer root of any real number, including square roots, cube roots, and higher-order roots, provides verification function to ensure calculation accuracy
Percentile Calculator · Online Percentile Value Calculation | Data Analysis and Statistics Tool
Free online percentile calculator, supports precise calculation of 1st-99th percentiles for any dataset, uses linear interpolation method for automatic sorting and calculation
Standard Deviation Calculator · Online Variance and Dispersion Analysis Tool
Free online standard deviation calculator, supports sample standard deviation and population standard deviation calculation, simultaneously calculates mean, median, and variance, suitable for statistical analysis
Variance Calculator · Online Variance and Standard Deviation Calculator | Data Analysis and Statistics
Free online variance calculator, supports sample variance and population variance, quickly calculates mean, variance, and standard deviation, enter data to get detailed statistical results
Probability Calculator · Online Event Probability Calculator | Success Odds and Statistical Analysis
Free online probability calculator, quickly calculates event success probability, failure probability, and odds ratio, supports success count and total count input, suitable for game drop rates, risk assessment, and other scenarios
Regression Analysis Calculator · Online Linear Regression Equation Calculator | Correlation Coefficient and Statistical Indicator Analysis
Free regression analysis calculator, quickly calculates linear regression equation, slope, and intercept, obtains correlation coefficient and coefficient of determination, supports multiple data point input, helps analyze linear relationships between variables
Permutation Calculator · Online Permutation Combination Calculator | Factorial and Combination Number Tool
Free online permutation combination calculator, quickly calculates permutation number P(n,k), combination number C(n,k), and factorial n!, supports detailed calculation step display
Frequency Distribution Calculator · Online Data Frequency Statistics Tool | Frequency and Relative Frequency Analysis
Free online frequency distribution calculator, quickly counts data frequency and relative frequency percentage, supports batch input with automatic sorting to generate distribution table
Average Calculator · Online Mean/Median/Mode Calculation Tool | Multi-Number Statistical Analysis
Free online average calculator, quickly calculates mean, median, and mode of a group of numbers, supports comma or space separated input, provides precise central tendency analysis
Mean, Median, Mode Calculator · Online Statistical Data Analysis Tool
Free online statistics calculator, quickly calculates mean, median, and mode of a dataset, supports range and sum analysis
Quartile Calculator · Online Statistical Data Analysis Tool | Median and Interquartile Range Calculation
Free online quartile calculator, quickly calculates Q1, median, Q3, and interquartile range IQR, supports batch data input with automatic sorting, provides detailed calculation steps
Correlation Coefficient Calculator · Online Pearson Correlation Coefficient Calculator | Data Correlation Analysis
Free online correlation coefficient calculator, quickly calculates Pearson correlation coefficient and coefficient of determination for two data sets, automatically determines correlation strength
Sample Size Calculator · Online Statistical Sample Estimation Tool | Survey and Experimental Design Assistant
Free online sample size calculator, supports 90%/95%/99% confidence levels and custom margin of error, provides finite population correction function, suitable for market research and medical trials
Z-Score Calculator · Online Standard Score Calculator | Normal Distribution Probability and Data Analysis Tool
Free Z-score calculator, quickly calculates standard scores and normal distribution cumulative probability, supports automatic judgment of data deviation degree, provides detailed calculation steps
Concentration Calculator · Online Solution Concentration Calculator | Mass Fraction and Percentage Conversion
Free online concentration calculator, quickly calculates solution mass fraction and percentage concentration, supports chemical experiment proportioning and pharmaceutical analysis
Force Calculator · Online Newton's Second Law Calculator | Force, Mass, Acceleration Conversion Tool
Based on Newton's second law, enter any two values to automatically calculate force, mass, or acceleration, providing precise mechanics conversion
Random Password Generator
Generate strong passwords with customizable length and character sets (digits, uppercase/lowercase letters, symbols), supports batch generation
Password Strength Checker
Multi-dimensional analysis of password complexity and entropy, with estimated crack time and improvement suggestions
Breach Database Check
Check online whether a password appears in known public credential stuffing databases (privacy-protected via k-Anonymity)
MD5 Hash
Generate a 128-bit hash value, commonly used for file integrity verification or quick fingerprinting
SHA-256/224 Hash
A highly secure 256-bit digest, a core algorithm for digital signatures and blockchain
SM3 National Cipher Digest
Standard of China's State Cryptography Administration, suitable for domestic security and government application scenarios
HMAC Authentication
Keyed-hash authentication based on MD5/SHA, used to verify message integrity and sender identity signature
AES Encryption/Decryption
Industry-grade Advanced Encryption Standard, supporting CBC, CFB, CTR, OFB, and ECB modes
DES Encryption
Traditional symmetric encryption standard, using single-length key mode, mostly for compatibility with legacy systems like power grids
TripleDES Encryption
Triple Data Encryption with three-key mode, more secure than DES, commonly used in financial systems
RC4 Classic Encryption
Stream symmetric encryption, suitable for legacy system compatibility due to its simple structure
Rabbit High-Speed Encryption
High-performance 128-bit stream algorithm optimized for software execution speed, with significantly higher security than RC4
SM4 Block Cipher (China National Standard)
Domestic symmetric encryption standard, widely used in e-government and domestic financial systems
RSA Toolkit
Supports key pair generation, public/private key encryption/decryption, and digital signing & verification
SM2 Asymmetric Cipher (China National Standard)
Domestic elliptic curve cryptography algorithm, covering encryption/decryption, signing, and key exchange
JWT Debugger
Supports JWT token decoding, signature verification, and token generation simulation
Base64 Converter
Supports Standard, URL Safe, and other modes, covering text & image (DataURL) conversion
Base58 (BTC)
Common encoding in Bitcoin, removing confusing characters like 0, O, I, l for better readability
Base16 (Hex)
Hexadecimal encoding using 0-9 and A-F, commonly used for viewing raw binary data, hash values, and color codes
Base32 (OTP)
Uses 32 case-insensitive characters, excluding confusing digits, widely used for Google Authenticator (2FA) keys
Base62 (ShortURL)
Composed of 0-9, a-z, A-Z with no special symbols, the preferred scheme for short URL generation and database ID compression
Base85 (Ascii85)
High-efficiency encoding scheme, more space-efficient than Base64, mainly used in PDF file storage and Git binary patches
Hex / Hexadecimal
Bidirectional conversion between raw binary streams and hex strings, supporting various delimiter formats
Unicode / UTF-16
Handles precise mapping conversion between UTF-8, UTF-16LE/BE, and Latin1 encodings
Punycode Domain
Converts non-ASCII domain names (e.g., Chinese) into browser-recognizable xn-- encoding
Quoted-printable
Common encoding for email transmission, converting non-ASCII characters into printable =XX format
HTML Entity Converter
Escapes special symbols (e.g., <) to prevent XSS attacks or display errors
Caesar Cipher
The classic shift cipher, supports custom offset and one-click brute-force cracking
Affine Cipher
Linear mathematical transformation encryption, a generalized mathematical form of the Caesar cipher
Vigenère Cipher
Polyalphabetic substitution cipher using a keyword as the key, strong resistance to frequency analysis
Rail Fence Cipher
A transposition cipher that changes letter order, creating a unique zigzag pattern
Polybius Square Cipher
Coordinate encryption based on a 5x5 grid, converting letters to row/column numbers
Morse Code
Bidirectional conversion between text and dot-dash (.-), supports real-time audio playback in browser
Bacon's Cipher
A unique encryption method that steganographically hides binary (A/B) within text
ROT13
A special Caesar cipher where encryption and decryption are identical, often used to hide spoilers
Keyboard Cipher
Encryption based on keyboard physical position offsets, popular in geek circles
Enigma Simulator
Simulation of WWII German mechanical encryption machine, with deep configurability for rotors and plugboard
Zero-Width Character Hiding
Embeds watermarks into plain text using invisible characters, preventing screenshots and tracing
Buddha Encryption
A classic Buddhist-style obfuscation tool that converts text into phrases like 'Thus Have I Heard'
Moe Talk / Nyan Talk
Fun conversion tool that encrypts content into 'meow~ awoo' sounds or specific anime-style symbols
Color Picker
Professional online color picker. Upload an image to extract colors in real time. Supports multi-format conversion including RGB/HEX/HSL/CMYK/HSV, and generates color schemes with one click.
Color Converter
One-click conversion between multi-dimensional color models · Supports HEX · RGB · HSL · CMYK · OKLAB
Color Mixer
Professional digital color mixing workbench based on CIELAB perceptual algorithm
RGB Color Chart
A color library and numerical reference tool for professional designers · Includes 500+ curated color values
Accessibility Color Contrast Checker
Based on international standard algorithms, accurately calculates the visual contrast between text and background to optimize web accessibility reading experience.
Spin Wheel Simulator
A lucky wheel simulation tool for randomly drawing rewards or punishments, perfect for party games
Relative Title Calculator
An online relative relationship title calculator for quickly looking up kinship terms, clarifying family relationships, with dialect mode support
Periodic Table
Online periodic table of elements
Scientific Calculator
Precise calculation supporting complex formulas and functions
Circle Area/Circumference Calculator
Calculate circle area and circumference
Fraction Calculator
Perform calculations in fraction form
Fraction Simplifier
Online fraction simplification calculator
Variance/Standard Deviation Calculator
Calculate variance and standard deviation online
Cone Surface Area Formula Calculator
Quickly calculate surface area by entering cone base radius and slant height, look up cone surface area formulas, and master lateral and base area calculation methods
Nth Power Calculator Online
Quickly calculate nth power results by entering base and exponent, supports positive/negative and decimal exponents, master power operation methods
Root Calculator Online
Quickly calculate square roots, cube roots, and any nth root by entering values, master root calculation formulas, scientifically compute various root results
Square Area Formula Calculator
Quickly calculate square area by entering side length, master square area formulas, accurately solve area results for various squares
Parallelogram Area Formula Calculator
Quickly calculate parallelogram area by entering base and height, master parallelogram area formulas, scientifically compute area results for various parallelograms
Cube Surface Area Formula Calculator
Quickly calculate cube surface area by entering edge length, master cube surface area formulas, accurately solve surface area results for various cubes
Geometric Series Sum Formula Calculator
Quickly calculate geometric series sum by entering first term, common ratio, and number of terms, master geometric series sum formulas, scientifically compute various geometric series sum results
Arithmetic Series Sum Formula Calculator
Quickly calculate arithmetic series sum by entering first term, common difference, and number of terms, master arithmetic series sum formulas, accurately solve various arithmetic series sum results
Arctangent (arctan) Calculator
Quickly calculate arctan values by entering numbers, supports angle/radian/gradian unit conversion, detailed arctan formulas, accurately solve arctangent calculation results
Divisor Calculator
Quickly find all divisors by entering positive integers, supports prime factorization, divisor count and divisor sum calculation, accurately solve various divisor-related results
Cylinder Surface Area Formula Calculator
Quickly calculate cylinder surface area by entering base radius and height, master cylinder surface area formulas, accurately solve cylinder base area, lateral area, and total surface area
Cone Surface Area Formula Calculator
Quickly calculate cone surface area by entering base radius and slant height, master cone surface area formulas, accurately solve various cone surface area results
Cuboid Surface Area Formula Calculator
Quickly calculate cuboid surface area by entering length, width, and height, master cuboid surface area formulas, accurately solve various cuboid surface area and volume results
Triangle Area Calculator
Quickly calculate triangle area by entering base and height or three side lengths, master triangle area formulas, accurately solve area results for various triangles
Volume Calculator
Quickly calculate volume by entering corresponding geometric parameters, covering common solid volume formulas, one-stop solution for various geometric volume results
Cone Volume Calculator
Quickly calculate cone volume by entering base radius and height, master cone volume formulas, accurately solve various cone volume results
Cylinder Volume Calculator
Quickly calculate cylinder volume by entering base radius and height, master cylinder volume formulas, scientifically compute various cylinder volume results
Sphere Volume Calculator
Quickly calculate sphere volume by entering radius, master sphere volume formulas, accurately solve various sphere volume results
Slope Calculator
Quickly calculate slope value by entering vertical height and horizontal distance, master slope calculation formulas, accurately solve slope results for various scenarios
Body Surface Area Calculator
Quickly calculate body surface area by entering height, weight, and other parameters, master body surface area formulas, accurately solve surface area results for human body or geometric shapes
Circumference to Diameter Calculator
Quickly calculate corresponding diameter by entering circle circumference, master circumference and diameter conversion formula, accurately solve circle diameter results
Trapezoid Area Calculator
Quickly calculate trapezoid area by entering upper base, lower base, and height, master trapezoid area formulas, accurately solve various trapezoid area results
Regular Hexagon Area Calculator
Quickly calculate regular hexagon area by entering side length, master regular hexagon area formulas, scientifically compute various regular hexagon area results
Ellipse Area Calculator
Quickly calculate ellipse area by entering semi-major and semi-minor axes, master ellipse area formulas, accurately solve various ellipse area results
Ellipse Circumference Calculator
Quickly calculate ellipse circumference by entering semi-major and semi-minor axes, master ellipse circumference approximation formulas, scientifically compute various ellipse circumference results
Log Calculator
Quickly calculate logarithm values by entering argument and base, master logarithm operation formulas, accurately solve various logarithm calculation results
Tan Angle Calculator
Quickly calculate tan values by entering angle values, supports angle/radian unit conversion, master tangent function formulas, accurately solve tan angle calculation results
Parallel Resistance Calculator
Quickly calculate total parallel resistance by entering multiple resistance values, master parallel resistance formulas, accurately solve total resistance results for parallel circuits
Series Resistance Calculator
Quickly calculate total series resistance by entering multiple resistance values, master series resistance formulas, scientifically compute total resistance results for series circuits
Resistance Voltage Divider Calculator
Quickly calculate voltage division results by entering supply voltage and divider resistance values, master voltage divider formulas, accurately solve voltage results for divider circuits
Parallel Resistance Current Divider Calculator
Quickly calculate branch currents by entering total current and parallel resistance values, master parallel current divider formulas, accurately solve current results for divider circuits
Sine Calculator
Quickly calculate sine values by entering angle values, supports angle/radian unit conversion, master sine function formulas, accurately solve sine calculation results
Cumulative Sum Online Calculator
Quickly calculate cumulative sum by entering a set of values, master cumulative sum operation rules, accurately solve cumulative sum results for various numerical sequences
Collatz Calculator
Professional online Collatz calculator, supports positive integer input to verify the Collatz conjecture
Equation Solver Tool
Professional online equation solving tool, supports linear/quadratic equations in one variable, systems of linear equations in two variables, transcendental equations, higher-degree polynomial equations, differential equations, and matrix equation solving, with detailed explanations of calculation methods and formulas
GPA Calculator
Supports China 4.0/5.0 scale, US 4.0 scale, UK 7-point scale, automatically calculates weighted GPA, local computation for enhanced security
Trigonometric Function Calculator
Professional online trigonometric function calculation tool, supports sin, cos, tan, cot, sec, csc calculations, angle/radian input, automatically outputs calculation results and detailed steps
Inverse Trigonometric Function Calculator
Professional online inverse trigonometric function calculation tool
Compound Interest Calculator
Free online compound interest investment calculator, supports periodic additional principal contributions and visual growth trend charts.
Bank Deposit Interest Calculator
Intelligently calculates the final earnings of three mainstream deposit products, fully compliant with actual bank interest calculation rules.
Life Path Number Calculator
Pythagorean Life Path Number Interpretation
Luban Ruler Online Calculator
Authentic 46.08cm Standard Edition_Luban Ruler Auspicious/Inauspicious Query_Door Measurement Conversion
Twelve Stages of Longevity Calculator · Eight Characters Four Pillars Ten Gods Status｜Heavenly Stems and Earthly Branches Prosperity/Decline Query｜Traditional Culture Tool
Enter Gregorian/Lunar birth date and time to accurately generate the Eight Characters Four Pillars chart, and calculate the corresponding Twelve Stages of Longevity status and Ten Gods relationships for each Heavenly Stem
Name Scoring Test Tool
Free online name score test, based on multi-dimensional analysis including Five-Grid Numerology, Five Elements Balance, and Three Dispositions Configuration
Nayin Fortune Calculator
Calculate Nayin Five Elements based on Eight Characters birth chart, query Five Elements attributes
Phone Number Numerology Analysis
Multi-dimensional analysis of phone number numerological characteristics based on traditional numerology, Five Elements balance, I Ching Eight Trigrams
Shen Sha (Spirit Deities) Query
Online Eight Characters Traditional Star Spirits Query Table | Traditional Eight Characters Spirit Deities Reference
Book of Answers
Online Book of Answers | Random Answer Generator | Psychological Guidance and Decision-Making Inspiration Tool
Xiao Liu Ren Divination
Xiao Liu Ren Traditional Query | Traditional Lunar Calendar Folk Custom Tool | Hourly Auspicious/Inauspicious and Traditional Reference