Convert any measurement between metric and US units – and see every other unit at once.
🔒 Calculated instantly in your browser.
How to use the unit converter
- Choose the type of measurement.
- Enter a value and pick the From and To units.
- Read the result and the full conversion list.
Common conversions
1 inch = 2.54 cm. 1 mile = 1.609 km. 1 kg = 2.205 lb. 1 US gallon = 3.785 litres. Celsius to Fahrenheit: multiply by 9/5 and add 32.
Frequently asked questions
How do I convert Celsius to Fahrenheit?
Choose Temperature, enter the °C value and pick °F.
What is the difference between MB and MiB?
MB is 1,000,000 bytes; MiB is 1,048,576 bytes (2^20).
Are US and UK gallons the same?
No – a UK gallon is about 20% larger (4.546 L vs 3.785 L).