Unit Converter — Metric and Imperial

This free unit converter handles the most common unit conversions across five categories: length, weight, temperature, volume, and speed. All conversions are instant and work in both directions.

How many cm in an inch?

1 inch = 2.54 centimetres. So 12 inches (1 foot) = 30.48 cm. Use the length converter above to convert any measurement instantly.

How many kg in a stone?

1 stone = 6.35 kilograms. So 10 stone = 63.5 kg, and 11 stone = 69.85 kg. Use the weight converter above for any conversion.

What is 100°F in Celsius?

100°F = 37.8°C. Normal body temperature (98.6°F) = 37°C. Water boils at 212°F = 100°C. Use the temperature converter above for any value.

How many litres in a UK gallon?

1 UK gallon = 4.546 litres. Note: a US gallon is smaller at 3.785 litres. Always specify UK or US when converting gallons.

How many km/h is 60 mph?

60 mph = 96.56 km/h. A useful rough rule: multiply mph by 1.6 to get km/h (e.g. 60 × 1.6 = 96).

Last updated: May 2026