How do I type a conversion?

Plainly: 70 kg to lbs, 5 ft in cm, 180 c to f. Abbreviations and full names both work.

Is a kilobyte 1000 or 1024 bytes?

1,024 here, matching operating systems. Drive makers use 1,000, which is why a 1 TB disk shows as 931 GB.

Why is temperature different?

The scales do not share a zero, so it is a multiplication and an offset rather than a simple factor.

Can it convert kg to metres?

No — those measure different things, so it explains rather than returning a meaningless number.

Conversions use exact defined factors where they exist: an inch is exactly 2.54 cm, a pound exactly 0.45359237 kg.

Unit converter — Free, no signup

Unit converter

Convert length, weight, temperature, area, volume, speed and data.

What to convert

Runs in your browser — nothing is sent anywhere.

This tool needs JavaScript, because the work happens on your own device rather than on a server. Everything below — the guide and the answers — works without it.

Type it the way you would say it

There are no dropdowns to work through. Write 70 kg to lbs, 5 ft in cm, 180 c to f or 2 gb in mb and the answer appears as you type. Abbreviations, full names and plurals all work.

What it covers

Length — metres, kilometres, centimetres, millimetres, miles, yards, feet, inches, nautical miles.
Weight — kilograms, grams, tonnes, pounds, ounces, stones.
Temperature — Celsius, Fahrenheit, Kelvin.
Volume — litres, millilitres, gallons, quarts, pints, cups, fluid ounces.
Area — square metres, hectares, acres, square feet.
Speed — m/s, km/h, mph, knots.
Data — bytes through terabytes, and bits.
Time — seconds through years.

Temperature is not like the others

Every other conversion here is a multiplication. Temperature is not, because Celsius and Fahrenheit do not share a zero — you multiply and offset. That is why 0 °C is 32 °F rather than 0 °F, and why the conversion resists doing in your head.

Data units, and the ambiguity in them

A kilobyte is 1,024 bytes here, which is the convention operating systems use. Drive manufacturers use 1,000, which is why a "1 TB" disk shows as 931 GB once formatted. Nothing is broken; the two industries simply never agreed. Bits are handled too — network speeds are quoted in bits and file sizes in bytes, a factor of eight that catches people out constantly.

Mismatched units are refused

Asking to convert kilograms to metres returns an explanation rather than a number, because there is no meaningful answer.

Nothing is uploaded

All of it runs in your browser.