Unit Converter
Convert between units across six categories: length, weight, temperature, volume, speed and digital data. It covers the everyday conversions — centimetres to inches, kilograms to pounds, Celsius to Fahrenheit, megabytes to gigabytes — without making you find a different page for each one.
How to convert units
- Pick a category — length, weight, temperature and more.
- Enter a value and choose the units to convert between.
- Read the converted value below.
When you'd use this
- Recipes and instructions — Converting measurements written for a different country's units.
- Forms and applications — A form that wants height in feet when you know it in centimetres.
- Travel — Making sense of temperatures, distances and speed limits abroad.
- Files and storage — Working out how many megabytes fit in a gigabyte allowance.
Good to know
- Six categories — Length in millimetres through to miles, weight from milligrams to pounds, temperature in Celsius, Fahrenheit and Kelvin, plus volume, speed and data.
- Temperature is not a simple ratio — Celsius, Fahrenheit and Kelvin have different zero points, so they are converted with offsets rather than by multiplying. The tool handles this properly.
- Results update as you type — Change the value or either unit and the answer follows immediately, with no button to press.
- Data units use 1024 — Digital storage is converted using the binary convention where a kilobyte is 1024 bytes, which is what operating systems report.
Frequently asked questions
Which categories are supported?
Length, weight, temperature, volume, speed and data storage, each with several common units.
How accurate are the conversions?
Standard conversion factors are used throughout, accurate to several decimal places.
How many centimetres are in an inch?
Exactly 2.54. Selecting inches and centimetres in the length category converts any value between them instantly.
Why does my file size look different on my computer?
Storage manufacturers often count a gigabyte as 1,000,000,000 bytes, while operating systems use 1,073,741,824. This is why a drive sold as 500 GB shows as roughly 465 GB once connected.
Can I convert temperatures below absolute zero?
The arithmetic will happily calculate it, but no such temperature exists physically. If you get a Kelvin figure below zero, check what you entered.