Unit converter
Choose a quantity and units. Below you will see the value converted to every other unit of the same quantity.
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How it is calculated
1 in = 2.54 cm 1 ft = 30.48 cm 1 mi = 1.609 km
1 lb = 0.4536 kg 1 US gal = 3.785 L 1 acre = 4047 m²
°F = °C × 9/5 + 32 K = °C + 273.15
All conversions use the exact definitions of the International System of Units.
Frequently asked questions
How many centimetres in an inch?
Exactly 2.54 cm.
How do I convert °F to °C?
Subtract 32 and multiply by 5/9. 100 °F is 37.8 °C.
How many square feet in an acre?
43,560 ft², about 4047 m².