Imperial to metric
1 inch = 2.54 centimetres
1 foot = 30 centimetres
1 mile = 1.6 kilometres
1 ounce = 28 grams
1 pound = 454 grams
1 pint = 0.6 litre
1 gallon = 4.6 litres
Metric to imperial
1 millimetre = 0.04 inch
1 centimetre = 0.4 inch
1 metre = 3 feet 3 inches
1 kilometre = 0.6 mile
1 gram = 0.04 ounce
1 kilogram = 2.2 pounds
1 Litre = 1.8 pints