Free Unit Converter

Convert length, weight, temperature, area, volume, speed and data — instantly, in your browser.

Amount Category

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Free tool — conversions happen in your browser. Data storage uses 1 KB = 1024 bytes.

Recipes in cups, a height in feet, a temperature in Fahrenheit, a parcel weight in pounds — the world uses different units, and converting them in your head is slow and easy to get wrong. This free unit converter changes length, weight, temperature, area, volume, speed and data storage between the units people actually use: metres to feet, kilometres to miles, kilograms to pounds, Celsius to Fahrenheit, litres to gallons, square metres to square feet, and many more. Type a number once and see the result instantly, with no sign-up and nothing to install. It is handy for students doing homework, cooks following a recipe from another country, travellers, online shoppers checking sizes, and anyone working with measurements from the US, UK, Europe or Asia.

How to use the Unit Converter

Pick what you want to convert — length, weight, temperature, area, volume, speed or data.
Type the number and choose the unit you have and the unit you want.
Read the converted result instantly, and change either unit to convert again.

Why use this tool

Seven kinds of conversion in one tool — length, weight, temperature, area, volume, speed and data.
Common units from around the world: metric, imperial and US units side by side.
Instant results as you type — no button to press, no waiting.
Free with no sign-up, and it works on any phone, tablet or computer.

Frequently asked questions

Which units can I convert?

Length, weight, temperature, area, volume, speed and data storage — including metres, feet, miles, kilograms, pounds, Celsius, Fahrenheit, litres, gallons, square metres and megabytes.

How do I convert Celsius to Fahrenheit?

Pick temperature, enter the Celsius value, and choose Fahrenheit as the target unit. The result appears instantly.

Is the conversion accurate?

Yes. The tool uses standard conversion factors, so results are accurate to the decimal places shown.

Do I need an internet connection?

You need the page to load, but the conversion itself happens in your browser, so it works even on a slow connection.