About unit converter
Recipes, shopping, travel and study all mix units: kilometres and miles, kilograms and pounds, litres and gallons. The converter handles length, weight, temperature, area, volume and speed.
Handy conversions to remember
- 1 inch = 2.54 cm; 1 foot = 30.48 cm; 1 mile = 1.609 km.
- 1 kg = 2.2046 lb; 1 lb = 453.6 g.
- 1 litre = 0.2642 US gallons; a US gallon differs from the UK gallon.
- °F = °C × 9/5 + 32.
Watch out for look-alike units
A US gallon, a UK (imperial) gallon, a US ton and a metric tonne are all different amounts. Pick the right system for your source.
A worked example
A recipe asks for 2 cups of milk, and your jug is marked in millilitres. One US cup is about 240 ml, so you need about 480 ml. A road sign shows 80 km/h, which is about 50 mph, and a 5 kg parcel is about 11 lb.
Rounding
Convert with the full factor and round only at the end. Rounding early and converting back can leave you a little off, especially for large numbers.
