Free calculators for work you already understand
Health, finance, math, and developer tools. 74 utilities with formulas you can read, results that stay in your browser, and no account wall.
Health & Fitness
BMI, calories, pregnancy, heart rate
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BMI Calculator
Calculate your Body Mass Index with height and weight
Calorie Calculator
Estimate daily calorie needs based on activity level
Heart Rate Zone Calculator
Find your optimal training heart rate zones
Ovulation Calculator
Predict your fertile window and ovulation date
Pregnancy Week Calculator
Track your pregnancy week and due date
Protein Intake Calculator
Calculate your daily protein needs by body weight and goal
Sleep Cycle Calculator
Find the best bedtime for full sleep cycles
Steps to Calories Calculator
Convert steps walked into calories burned
Water Intake Calculator
Calculate your daily water intake recommendation
Vision Test
Quick online visual acuity test
Stress Test
Assess your stress level with a quick questionnaire
Finance & Math
Loans, interest, investments, math
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Compound Interest Calculator
Calculate growth of investments with compound interest
Loan Calculator
Calculate monthly payments and total interest on loans
Savings Interest Calculator
Project savings growth with interest over time
Retirement Calculator
Estimate how much you need to save for retirement
Stock Return Calculator
Calculate total return and CAGR on stock investments
Installment Interest Calculator
Calculate total interest on installment payments
Percentage Calculator
Calculate percentages, increases, and decreases
Probability Calculator
Calculate event probabilities and combinations
Standard Deviation Calculator
Calculate mean, variance, and standard deviation
GCD & LCM Calculator
Find the greatest common divisor and least common multiple
Prime Number Checker
Check if a number is prime and find prime factors
Trigonometry Calculator
Calculate sin, cos, tan and inverse trig functions
Ratio Calculator
Simplify ratios and solve ratio proportions
Developer Tools
Encoders, converters, generators
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Base64 Encoder/Decoder
Encode and decode text or files using Base64
Border Radius Generator
Visually generate CSS border-radius values
Box Shadow Generator
Create and preview CSS box-shadow styles
Color Code Converter
Convert between HEX, RGB, HSL, and CMYK color codes
Color Palette Generator
Generate beautiful color palettes from a base color
Cron Expression Parser
Parse and explain cron job schedule expressions
CSS Grid Generator
Build and export CSS grid layouts visually
CSV to JSON Converter
Convert CSV data to JSON format instantly
Diff Checker
Compare two texts and highlight differences
Dummy Image Generator
Generate placeholder images with custom dimensions
Favicon Generator
Create favicons from emoji or text
Flexbox Playground
Interactive CSS flexbox layout visualizer
Font Preview Tool
Preview Google Fonts with custom text
Gradient Generator
Create and export CSS gradient styles
Hash Generator
Generate SHA-1 and SHA-256 hashes from text
HTML Entity Encoder/Decoder
Encode and decode HTML entities
HTTP Status Code Reference
Look up HTTP status codes and their meanings
Image Compressor
Compress images client-side without uploading
IP Lookup Tool
Look up your current IP address and location
JSON Formatter/Validator
Format, validate, and minify JSON data
JWT Decoder
Decode and inspect JSON Web Token payloads
Lorem Ipsum Generator
Generate placeholder lorem ipsum text
Markdown Preview
Write and preview Markdown in real-time
Meta Tag Generator
Generate HTML meta tags for SEO
Number Base Converter
Convert between binary, octal, decimal, and hex
Password Generator
Generate strong random passwords with custom rules
QR Code Generator
Generate QR codes from URLs or text
Regex Tester
Test and debug regular expressions with live match highlighting
Signature Generator
Create professional HTML email signatures
SVG Editor
Edit and optimize SVG code with live preview
Timestamp Converter
Convert Unix timestamps to human-readable dates
URL Encoder/Decoder
Encode and decode URL query strings and paths
User Agent Parser
Parse and decode browser user-agent strings
UUID Generator
Generate random v4 UUIDs in bulk
Utility Tools
Units, time, text, productivity
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Age Calculator
Calculate exact age in years, months, and days
Character Counter
Count characters, words, and sentences in text
Currency Converter
Convert between major world currencies
D-Day Calculator
Count days until or since any date
Random Picker
Pick a random item from a list
Timer & Stopwatch
Online countdown timer and stopwatch
Typing Test
Practice typing or test your speed with a 60-second WPM challenge
Unit Converter
Convert between length, weight, temperature, and more
World Clock
View current time across multiple time zones
Multiplication Table
Generate and explore multiplication tables
Molecular Weight Calculator
Calculate molecular weight from chemical formulas
GPA Calculator
Calculate cumulative GPA from course grades
GPA Converter
Convert GPA between 4.0, percentage, and letter grade scales
Area & Perimeter Calculator
Calculate area and perimeter of common shapes
Blood Type Compatibility
Check blood type compatibility for transfusion and donation
Vocabulary Quiz
Test and expand your English vocabulary
Built as a working directory, not a landing page
AnyCalc is 74 single-purpose tools. Each page shows the calculator first, then the method, edge cases, and limits. Math runs on your device. We do not require an account and we do not upload your inputs for computation.
Health and fitness
BMI (WHO adult bands), TDEE via Mifflin-St Jeor, heart-rate zones, pregnancy week, ovulation, protein and water targets, sleep cycles. We call out when BMI or estimates fail for athletes or clinical use.
Finance and math
Compound interest, loans, savings, retirement, stock returns, installments, percentages, probability, standard deviation, GCD/LCM, primes, trigonometry, ratios. Planning aids, not licensed advice.
Developer tools
JSON, Base64, JWT, regex, hashes, timestamps, UUID, CSS helpers, converters. Paste, compute, copy. No install step.
Everyday utilities
Units, currency, age, D-day, GPA, timers, typing tests, character counts, world clock. Small jobs that should not require a download.
How we review formulas: editorial policy. Who runs this: about. Found a bug: contact.