Unit Converters
All six unit converters in one place. Switch between length, weight, temperature, speed, area, and volume. Results update instantly as you type.
New to converting between measurement systems? Read our guide explaining how unit conversion works to see when each converter is the right one to reach for.
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Quick Reference
Frequently Asked Questions
How many cm in an inch?
1 inch = 2.54 centimetres exactly. This has been the internationally agreed definition since 1959. To convert inches to cm, multiply by 2.54. To convert cm to inches, divide by 2.54.
How many pounds in a kilogram?
1 kilogram = 2.20462 pounds. To convert kg to lbs, multiply by 2.20462. To convert lbs to kg, multiply by 0.453592.
How do I convert Celsius to Fahrenheit?
Multiply Celsius by 1.8 then add 32. Formula: F = C x 1.8 + 32. For example, 20°C = 20 x 1.8 + 32 = 68°F. To convert F to C: subtract 32, then divide by 1.8.
How many km/h in 1 knot?
1 knot = 1.852 km/h exactly. Knots are used in aviation and maritime navigation and are defined as one nautical mile per hour. 1 nautical mile = 1.852 km.
How many acres in a hectare?
1 hectare = 2.47105 acres. 1 acre = 0.404686 hectares. Hectares are the metric unit for land area (1 ha = 10,000 m2). Acres are used primarily in the US, UK, and other countries that use the imperial system.
How many ml in a US cup?
1 US cup = 236.588 millilitres. 1 US tablespoon = 14.79 ml. 1 US teaspoon = 4.93 ml. Note that UK and Australian cups differ: 1 metric cup = 250 ml.