Unit Converter — Length, Weight, Volume, Speed, Temperature
Pick a category and convert between metric and imperial units instantly — no ads-heavy tables, no sign-up. Covers the conversions people actually need: length, weight, volume, speed and temperature.
Unit Converter
Length, weight, volume, speed, temperature
How it works
- 1 inch = 2.54 cm, 1 mile = 1.609 km, 1 kg = 2.205 lb.
- 1 US gallon = 3.785 litres; a UK gallon is 4.546 litres.
- °F = °C × 9/5 + 32.
- 1 ounce = 28.35 g; 1 stone = 6.35 kg (14 lb).
- Speed: 100 km/h ≈ 62 mph; 1 knot = 1.852 km/h.
Worked example: 72 °F to Celsius
- 1Subtract 32: 72 − 32 = 40.
- 2Multiply by 5/9: 40 × 5 ÷ 9 = 22.2.
- 3So 72 °F is a pleasant 22.2 °C.
72 °F = 22.2 °C
Most-searched conversions
| From | To | Multiply by |
|---|---|---|
| Inches | Centimetres | 2.54 |
| Feet | Metres | 0.3048 |
| Miles | Kilometres | 1.609 |
| Pounds | Kilograms | 0.4536 |
| US gallons | Litres | 3.785 |
| Ounces | Grams | 28.35 |
Frequently asked questions
How many kilometres is a mile?
One mile is 1.609 kilometres, so 5 miles is about 8 km.
How do I convert Celsius to Fahrenheit?
Multiply by 9/5 and add 32. For 25 °C: 25 × 9 ÷ 5 + 32 = 77 °F. To go the other way, subtract 32 and multiply by 5/9.
What is the difference between a US and a UK gallon?
A US gallon is 3.785 litres while a UK (imperial) gallon is 4.546 litres — about 20% larger. The same applies to pints and fluid ounces.
How many centimetres is 5 feet 10 inches?
5 ft 10 in is 70 inches, and 70 × 2.54 = 177.8 cm.
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