Tools
Calculators
Percentage, fractions, ratios, averages and more.
Scientific Calculator
Standard and scientific calculator with variables, history and DEG/RAD modes.
Function Grapher
Plot up to 4 functions with zoom, pan and a live value crosshair.
Percentage Calculator
What is P% of V, N as a percent of V, and value increased or decreased by a percent.
Percentage Increase Calculator
Percentage change between two values, with absolute change and multiplier.
Fraction Calculator
Simplify fractions, convert to decimal and percent, and decimals back to exact fractions.
Average Calculator
Mean, median, mode, sum, count, min, max, variance and standard deviation.
Ratio Calculator
Simplify ratios, convert to decimal and percent, and solve A:B = C:x.
Proportion Calculator
Solve a : b = c : x for the missing value.
Simple Interest Calculator
Compute simple interest I = P × r × t with total amount and per-period interest.
Converters
Length, weight, temperature, area, volume, speed, time and data units.
Length Converter
Convert between millimeters, centimeters, meters, kilometers, inches, feet, yards and miles.
Weight Converter
Convert between milligrams, grams, kilograms, tonnes, ounces, pounds and stone.
Temperature Converter
Convert between Celsius, Fahrenheit and Kelvin.
Area Converter
Convert between square millimeters, square centimeters, square meters, hectares, square kilometers and imperial area units.
Volume Converter
Convert between milliliters, liters, cubic meters and US gallons, quarts, pints, cups and fluid ounces.
Speed Converter
Convert between m/s, km/h, mph, knots and ft/s.
Time Converter
Convert between nanoseconds, microseconds, milliseconds, seconds, minutes, hours, days and weeks.
Data Size Converter
Convert between bytes, KB/MB/GB/TB (1000-based) and KiB/MiB/GiB/TiB (1024-based).
Finance
Compound interest, loans, mortgages, investments, salary and tax.
Compound Interest Calculator
Compound interest with configurable compounding frequency, monthly contributions and a year-by-year table.
Loan Payment Calculator
Monthly payment, total interest and a yearly amortization schedule for any loan.
Mortgage Calculator
Monthly payment including principal, interest, tax, insurance and HOA, with an amortization schedule.
Investment Return Calculator
Future value of an initial investment plus monthly contributions, year by year.
ROI Calculator
Return on investment from cost and revenue, with net profit and return multiple.
Discount Calculator
Final price and savings from a percentage discount, for one or many items.
Salary Calculator
Convert an annual salary into hourly, weekly, biweekly, monthly and daily rates.
Tax Calculator
Simple flat-rate income tax: tax owed and net income from gross salary.
Tools
Passwords, QR codes, UUIDs, text and JSON utilities, colors.
Word Counter
Live word, character, sentence and paragraph counts plus reading time.
Character Counter
Count characters, letters, digits, spaces, symbols and UTF-8 bytes.
JSON Formatter
Format and minify JSON with exact error positions, fully in your browser.
Base64 Encoder / Decoder
Encode text to Base64 or decode it back, with Unicode and URL-safe support.
Password Generator
Generate strong random passwords with crypto-grade randomness.
UUID Generator
Generate random UUID v4 identifiers in bulk.
Random Number Generator
Draw random integers in any range, with or without duplicates.
QR Code Generator
Turn text or URLs into downloadable QR codes, generated entirely in your browser.
Color Converter
Convert colors between HEX, RGB and HSL with a live swatch and complement.