How to use Unit converter
- Choose a measure such as Length or Temperature.
- Type the value and choose From and To units.
- Read the answer, or check the table for every unit.
Questions
Are the conversion factors exact?
Yes for the defined ones: 1 inch is exactly 2.54 cm, 1 pound is exactly 0.45359237 kg and 1 mile is exactly 1,609.344 m. Results are rounded for display.
Why are there two kinds of megabytes?
Storage makers use 1 MB = 1,000,000 bytes. Some operating systems count 1 MiB = 1,048,576 bytes, which is why a “500 GB” drive shows about 465 GiB.
Are US and UK gallons the same?
No. A US gallon is 3.785 liters; a UK (imperial) gallon is 4.546 liters.
Last updated 13 November 2026.