Everyday Unit Converters: Km to Miles, Celsius to Fahrenheit, Stones, Feet to CM, Oven Gas Mark and Gallons
Free converters for km to miles, Celsius to Fahrenheit, stone to kg, feet and inches to cm, oven temperatures, cm to inches, pounds to kg and litres to gallons.

Metric and imperial units mix constantly: road signs in miles, recipes in gas marks, weight in stones, height in feet. These free converters give a quick answer. They run in your browser with no sign-up.
Quick answer
| Convert | Tool |
|---|---|
| Kilometres and miles | Km to Miles |
| Celsius, Fahrenheit, Kelvin | Celsius to Fahrenheit |
| Stones, pounds and kilograms | Stone to Kg |
| Feet and inches to centimetres | Feet and Inches to CM |
| Oven temperatures and gas marks | Oven Temperature Converter |
| Centimetres and inches | CM to Inches |
| Pounds and kilograms | Pounds to Kg |
| Litres and gallons | Litres to Gallons |
The numbers worth remembering
- 1 mile = 1.609 km, so 10 km is 6.21 miles and a marathon is 26.2 miles.
- °F = °C × 9/5 + 32. 20 °C is 68 °F and 37 °C is 98.6 °F.
- 1 stone = 14 pounds = 6.35 kg.
- 1 inch = 2.54 cm, so 5 ft 9 in is about 175 cm.
- 1 US gallon = 3.785 litres and 1 UK gallon = 4.546 litres.
Oven temperatures
Gas mark 4 is 180 °C or 350 °F. A fan oven runs about 20 °C lower than a conventional one for the same recipe, so use the fan value shown by the converter.
Tips
- Check which gallon or ounce a recipe or car means. US and UK units differ.
- For quick mental estimates, multiply kilometres by 0.6 for miles and double Celsius then add 30 for Fahrenheit.
Frequently asked questions
Are the results exact? Yes, they use the exact definitions such as 2.54 cm to an inch.
Do they work offline? Once the page has loaded, the calculations happen in your browser.


