Common conversions at a glance
| Convert | Multiply by | Example |
|---|---|---|
| Kilometres → miles | 0.621371 | 10 km = 6.21 mi |
| Miles → kilometres | 1.609344 | 26.2 mi = 42.2 km |
| Kilograms → pounds | 2.204623 | 70 kg = 154.3 lb |
| Pounds → kilograms | 0.453592 | 150 lb = 68.0 kg |
| Stone → kilograms | 6.350293 | 11 st = 69.9 kg |
| Inches → centimetres | 2.54 | 12 in = 30.48 cm |
| Feet → metres | 0.3048 | 6 ft = 1.83 m |
| US cups → millilitres | 236.588 | 2 cups = 473 ml |
| Litres → US gallons | 0.264172 | 50 L = 13.2 gal |
| Square metres → square feet | 10.7639 | 20 m² = 215 ft² |
| km/h → mph | 0.621371 | 100 km/h = 62 mph |
Celsius and Fahrenheit
To convert °C to °F, multiply by 9, divide by 5 and add 32. To convert °F to °C, subtract 32, multiply by 5 and divide by 9. A quick estimate: double the Celsius number and add 30 (20°C ≈ 70°F; the exact answer is 68°F).
| °C | °F | Feels like |
|---|---|---|
| −10 | 14 | Freezing cold |
| 0 | 32 | Water freezes |
| 10 | 50 | Cool, need a jacket |
| 20 | 68 | Room temperature |
| 30 | 86 | Hot summer day |
| 37 | 98.6 | Body temperature |
| 180 | 356 | Moderate oven (gas mark 4) |
| 220 | 428 | Hot oven (gas mark 7) |
US, UK and metric cups and pints
Recipes cause the most confusion. A US cup is 236.6 ml, while Australia, New Zealand and Canada often use a metric cup of 250 ml. A UK pint is 568 ml but a US pint is 473 ml, and a UK gallon (4.546 L) is about 20% bigger than a US gallon (3.785 L). Pick the right one from the list above.
Unit Converter FAQs
How many miles is 5 km?
5 km is 3.11 miles. Multiply kilometres by 0.621371 to get miles.
How many pounds is 1 kg?
1 kilogram is 2.2046 pounds. To convert pounds to kilograms, multiply by 0.4536.
How do I convert stone to kg?
Multiply stone by 6.35. For stone and pounds, convert everything to pounds first (1 stone = 14 lb), then multiply by 0.4536.
What is 180°C in Fahrenheit?
180°C is 356°F. Many recipes round it to 350°F.
How many ml is a cup?
A US cup is 236.6 ml. A metric cup used in Australia, New Zealand and Canada is 250 ml.