Length Converter
Convert between millimetres, centimetres, metres, kilometres, inches, feet, yards, miles and nautical miles. Instant, exact and entirely in your browser.
Converters
Unit Converters
One conversion engine behind every one of these, with the exact factors written down rather than approximated. Change a value and the result updates as you type.
5 converters
Convert Anything, Exactly
Weight Converter
Convert between milligrams, grams, kilograms, tonnes, ounces, pounds, stone and US tons. Runs entirely in your browser.
Temperature Converter
Convert between Celsius, Fahrenheit and Kelvin, including negative temperatures. Shows the formula it used.
Area Converter
Convert between square millimetres, centimetres, metres, kilometres, inches, feet, yards, acres and hectares.
Data Size Converter
Convert between bits, bytes and every multiple, keeping decimal (KB, MB, GB) and binary (KiB, MiB, GiB) units clearly apart.
12 shortcuts
Common Conversions
The conversions people look up most, each on its own page with a reference table you can read without waiting for anything to load. They are the same engine as the converters above, opened on one pair.