What the unit converter covers
This converter handles the everyday measurement categories in one place: length, weight, temperature, volume, area, speed and time. Choose a category, pick the two units and type a value. The result updates as you type, and a swap button reverses the units.
Temperature uses the real formulas (Celsius, Fahrenheit and Kelvin) instead of a single multiplier, because temperature scales have different zero points.
How to use it
- Choose a category such as length or temperature.
- Select the from unit and the to unit.
- Type a value to see the converted result straight away.
Handy conversions to remember
A few reference values:
1 inch = 2.54 cm
1 foot = 30.48 cm
1 mile = 1.609 km
1 kg = 2.205 lb
1 lb = 453.6 g
1 US gallon = 3.785 litres
F = C x 9/5 + 32 C = (F - 32) x 5/9
K = C + 273.15Tips for accurate results
- Check the unit variant. A US gallon is not an imperial (UK) gallon, and a tonne is not a US ton.
- Keep enough decimal places for engineering work, and round only at the end.
- For cooking, weight in grams is more reliable than volume in cups.
Everyday examples
Quick checks people make with a unit converter:
- Recipe from a US site: 350 degrees Fahrenheit is about 177 degrees Celsius.
- A road sign or race distance: 10 miles is about 16.1 kilometres.
- A parcel limit: 20 kilograms is about 44.1 pounds.
- A screen or room size: square metres to square feet when comparing listings (1 square metre is about 10.76 square feet).
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