Unit Converter

Why the same number can mean different things in different units

Units are just agreed rulers, but the world never agreed on one set. A recipe written in cups, a speed limit in miles, a weather forecast in Fahrenheit — each makes sense where it was written and confuses everyone elsewhere. Converting well is more than swapping numbers: temperature scales start at different points, and digital storage uses two rival definitions of a gigabyte. Knowing which system you are in, and what the result should roughly look like, stops small mix-ups from becoming expensive ones.

What to do, step by step

1. Pick the right tab above — length, weight, temperature, or data — so the units you need appear.
2. Type your amount, then choose the unit you have and the unit you want; the answer appears instantly.
3. Use the swap button to reverse the conversion and check the result takes you back to your starting number.
4. Sanity-check the size: a kilogram is a little over two pounds, and a mile is longer than a kilometre.
5. For temperature, remember the scales are offset, not just scaled — doubling Celsius does not double Fahrenheit.