Unit Converter
Six categories, every common unit, converting live as you type. The swap button flips direction.
Converted on your device.
Conversions worth memorizing
| This | Equals |
|---|---|
| 1 inch | 2.54 cm exactly |
| 1 mile | 1.609 km |
| 1 kg | 2.205 lb |
| 1 US gallon | 3.785 L |
| 1 acre | 43,560 sq ft |
| 20°C | 68°F (room temperature) |
Common questions
How many cups are in a gallon?
16 US cups in a US gallon. The chain: 1 gallon = 4 quarts = 8 pints = 16 cups = 128 fluid ounces.
How do you convert Celsius to Fahrenheit?
Multiply by 9/5 and add 32: 20°C → 68°F. Going the other way, subtract 32 and multiply by 5/9. The two scales cross at -40°, the only temperature that's the same number in both.
How many kilometers in a mile?
1.609344 km exactly — the international mile has been defined in metric terms since 1959. Quick mental math: miles × 1.6, or for speed, mph × 1.6 ≈ km/h.
Are these US or UK measurements?
Volume units here are US customary (a US gallon is 3.785 L; the UK imperial gallon is 4.546 L — about 20% bigger, which is why UK fuel economy numbers look so good). Weight and length units are identical in both systems.