Conversion tool · Free · No sign-up

Unit Converter

Convert length, weight, temperature, volume, data and more.

From

0.001

1 Millimetre = 0.001 Metre

About this tool

This free unit converter handles everyday conversions across length, weight/mass, temperature, volume, area, speed, digital storage and time. Switch between metric and imperial units — kilometres to miles, kilograms to pounds, Celsius to Fahrenheit, litres to gallons and many more — with accurate, instant results computed in your browser.

Key features

8 categories

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

Standardised factors

Uses exact international conversion factors for accuracy.

Instant + offline

Results compute locally with no network calls after load.

How to use it

1Pick a category such as Length, Weight or Temperature.
2Choose the unit you're converting from and the unit you want.
3Enter a value — the result updates instantly.
4Swap the two units with one click to reverse the conversion.

Common use cases

Following a recipe written in different units.
Converting measurements for DIY and engineering tasks.
Translating file sizes between MB, GB and TB.

Frequently asked questions

Which categories are supported?

Length, weight/mass, temperature, volume, area, speed, digital storage and time, each with the most common metric and imperial units.

Are the conversions accurate?

Yes — conversions use internationally standardised factors (for example 1 inch = 2.54 cm exactly), and temperature uses the proper Celsius/Fahrenheit/Kelvin formulas.

Does it work offline?

Once the page has loaded, all conversions run locally in your browser with no further network requests.

Private and free. Most of our tools run entirely in your browser, so the data you enter isn't uploaded or stored. There's no sign-up, and there never will be — they're built by the Fusion Trail Solutions team to be genuinely useful.