How to use
- Choose a category, e.g. length or temperature.
- Enter a value and pick the source and target units.
- The result appears instantly, with a conversion into every unit of the category below.
Metric and imperial units
Most countries use the metric system, while the US (and partly the UK) uses inches, feet, miles, pounds and gallons. The converter uses the exact official conversion factors, e.g. 1 inch = 2.54 cm and 1 pound = 0.45359237 kg.
Volumes use US measures (1 gallon = 3.785 liters). For data sizes there are two systems: KB/MB/GB (factor 1000) and KiB/MiB/GiB (factor 1024), as shown by many operating systems.
Frequently asked questions
How many centimeters are in an inch?
One inch is exactly 2.54 centimeters.
How do I convert Fahrenheit to Celsius?
Celsius = (Fahrenheit − 32) × 5 ÷ 9. So 100 °F is about 37.8 °C.
Why does my computer show fewer GB than the drive label?
Manufacturers use 1 GB = 1,000,000,000 bytes, many operating systems 1 GiB = 1,073,741,824 bytes. So 1 TB is only about 931 GiB.