Length Converter
Convert meters, feet, inches, miles and more with NIST-exact factors.
Use tool →Converters & Math Tools 13
Units, geometry and number converters. Every tool below is free, needs no sign-up, and runs entirely in your browser — your data never leaves your device.
Weight Converter
Convert kg, pounds, ounces, stones and tons instantly.
Use tool →Temperature Converter
Convert Celsius, Fahrenheit and Kelvin with exact formulas.
Use tool →Area Converter
Convert m², ft², acres, hectares and more with exact factors.
Use tool →Volume Converter
Convert liters, gallons, cups and cooking units instantly.
Use tool →Proportion Calculator
Solve a:b = c:x by cross multiplication with three known values.
Use tool →Perimeter Calculator
Perimeter of squares, rectangles, circles, triangles and polygons.
Use tool →Area Calculator
Area of six 2-D shapes with exact formulas and live updates.
Use tool →Surface Area Calculator
Total surface area of cubes, boxes, spheres, cylinders and cones.
Use tool →Volume Calculator
Volume of five standard solids with exact π formulas.
Use tool →Pi Digits Lookup
Look up the first 100–10,000 digits of π, computed live.
Use tool →Data Size Converter
Bytes to every SI and binary data unit (kB/MB/GB, KiB/MiB/GiB) at once.
Use tool →Percentage Calculator
Three percentage questions in one: portions, shares and increase/decrease.
Use tool →Browse other categories 7
Health
BMI, calories, heart rate and body calculators
Browse category →Life
Age, loans, sizes and everyday lookups
Browse category →Generators
QR codes, barcodes, passwords and random data
Browse category →Developer
Encoders, formatters, hashes, ciphers and port checks
Browse category →Text & Office
Case converters, symbols and text utilities
Browse category →Image
Resize, compress, crop and convert — all local
Browse category →Just for Fun
Lucky wheels, pickers and novelty tools
Browse category →