Unit Converter
A free collection of unit converters for length, weight, temperature, area, volume, speed, data storage, cooking measurements and shoe sizes.
This is a free, no-install collection of unit converters that runs right in your browser. Enter a value and instantly convert length, weight, temperature, area, volume, speed, data, cooking measurements and shoe sizes.
Every conversion happens locally on your device. Your input is never sent to or stored on a server.
All converters
Length Converter
Convert mm, cm, m, km, inches, feet, yards and miles instantly.
Weight Converter
Convert mg, g, kg, t, ounces, pounds plus Korean geun (600g) and don (3.75g).
Temperature Converter
Convert Celsius (°C), Fahrenheit (°F) and Kelvin (K) with exact formulas.
Area Converter
Convert m², km², hectares, acres, ft² and Korean pyeong.
Volume Converter
Convert mL, L, m³, US gallons, fluid ounces and cups.
Speed Converter
Convert m/s, km/h, mph, knots and Mach instantly.
Data Storage Converter
Convert B, KB, MB, GB and TB on a 1024 or 1000 base.
Cooking Measurement Converter
Convert cups, tablespoons and teaspoons to mL and grams by ingredient.
Shoe Size Converter
Convert US, UK, EU and Korean (mm) sizes with men's and women's charts.
Unit conversion guides
Why use this converter
- Free, no install — Use it straight from your browser with no sign-up or app.
- Real-time — Every unit updates the instant you type a value.
- Accurate factors — Uses international standards such as 1 inch = 2.54 cm and 1 pound = 453.59237 g.
- Privacy first — All math runs in your browser; your input never leaves your device.
For non-linear conversions such as cooking measurements and shoe sizes we use ingredient density tables and standard size charts. See the unit conversion guide for the exact reference data.
Last updated: 2026-06-25