Measurements translated, exactly
Unit converters translate a measurement from one system into another without the arithmetic errors that creep in when you do it in your head. Feet to metres for a room plan. Pounds to kilos for a luggage limit. Fahrenheit to Celsius for a recipe written on another continent. Each converter on this page handles one family of units and shows the whole table at once, so you can read off the value you need instead of converting one number at a time.
The conversions use the exact international definitions where they exist: an inch is 25.4 millimetres by definition, a pound is 0.45359237 kilograms, and a mile is 1609.344 metres. Temperature is the odd one out, since it converts by formula rather than by a simple ratio, and the data storage converter follows the convention printed on its page for kilobytes and megabytes, a corner of computing where two honest definitions still compete.
You will find 11 converters below: length, weight, temperature, area, volume, speed, energy, pressure, power, data storage and angle. Between them they cover the units that show up in travel, cooking, building, shipping and schoolwork, in both metric and imperial directions. Keep the page open in a tab and every conversion in the family stays one glance away.
Everything is free and instant, and it all runs in your browser. Type the number once, read the row you need, and double check the unit name before you act on it. Most conversion mistakes in the real world are not maths mistakes at all. They are the right number wearing the wrong label.