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How to use the Unit Converter
- 1Pick a category such as length or weight.
- 2Choose the units to convert from and to.
- 3Type a value; the result and a chart of common values appear instantly.
Metric vs imperial
The metric system (meters, kilograms, liters) is used by almost every country. The US customary system (inches, pounds, gallons) is still used in the United States for everyday measurements. US cups, pints and gallons are smaller than the UK imperial versions; this converter uses US measures.
Most-used conversions
| From | To | Multiply by |
|---|---|---|
| Inches | Centimetres | 2.54 |
| Feet | Metres | 0.3048 |
| Miles | Kilometres | 1.609344 |
| Pounds | Kilograms | 0.45359237 |
| Ounces | Grams | 28.3495 |
| US gallons | Litres | 3.78541 |
| US cups | Millilitres | 236.588 |
| Square feet | Square metres | 0.092903 |
| Acres | Hectares | 0.404686 |
US vs UK units
Watch out for gallons and pints: a US gallon is 3.785 litres but an imperial (UK) gallon is 4.546 litres, and a US pint is 473 ml versus 568 ml in the UK. Recipes and fuel economy figures from the two countries are not directly comparable.
Frequently asked questions
How accurate are the conversions?
All factors use the exact international definitions (for example 1 inch = 2.54 cm and 1 pound = 0.45359237 kg). Results are rounded to 6 significant digits for readability.