How accurate are the conversions?

We use standard conversion factors. For everyday use the results are highly accurate. A few specialised units use common approximations.

Is my data sent anywhere?

No. Every conversion runs entirely in your browser. Nothing is uploaded or stored.

Can I convert between any units?

Within each category you can convert between any two units. For example, in Length you can convert any unit to any other — meters to miles, inches to yards, and so on.

Does it support metric and imperial?

Yes. Both metric and imperial units are included in every relevant category.

What is the difference between a kilobyte and a kibibyte?

A kilobyte (KB) is 1,000 bytes in SI convention. A kibibyte (KiB) is 1,024 bytes in the IEC binary convention. Storage manufacturers use SI (1 KB = 1000 B), while most operating systems historically used the binary system (1 KB = 1024 B), which is why a 500 GB drive shows as ~465 GB in Windows.

Why does 1 mile equal exactly 1609.344 metres?

The international mile was standardized in 1959 by an agreement between English-speaking countries. It is defined as exactly 1609.344 metres, which is 5280 feet × 0.3048 m/ft. Before that, different countries had slightly different mile lengths.

Unit Converter

Convert between units of length, weight, temperature, area, volume, speed, time, data, pressure and energy. Enter a value once and see it converted to every other unit in the same category, or swap the direction with one click.

How to use

Pick a category

Choose length, weight, temperature, area, volume, speed, time, data, pressure or energy.

Select units

Choose the unit you are converting from and the unit you want to convert to.

Enter a value

Type the value to convert — the result updates instantly.

Swap if needed

Use the swap button to reverse the conversion direction.

From

0.001

All conversions

Features

Ten categories

Length, weight, temperature, area, volume, speed, time, data, pressure and energy.

All conversions at once

See the value converted to every other unit in the same category.

Swap units

Reverse the conversion direction with one click.

Works offline

Runs entirely in your browser — nothing is sent to a server.

Common use cases

Convert centimeters to inches
Convert kilograms to pounds
Convert Celsius to Fahrenheit
Convert miles per hour to kilometers per hour

Frequently Asked Questions

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