Basic factsAlthough we have been using the metric system for ages a lot of people in Britain (but very few on the continent) still work in Imperial units. For instance, there' s a good chance that you know your weight in stones and your height in feet and not kilograms and metres! Due to this you still need to know both systems and be able to convert(approximately) between them. MetricHere are some basic facts that you should know: Length1cm = 10mm1m = 100cm1km = 1000m Mass:1kg = 1000g1 tonne = 1000kg Volume:1 litre = 1000ml = 1000cm3 Note to remember:1m = 100cm1m2 = 10 000cm2 1m3 = 1 000 000cm3 ImperialHere are some more facts that you should know: Length:1 foot = 12 inches1 yard = 3 feet1 mile = 1760 yards Length:1 pound = 16 ounces1 stone = 14 pounds1 ton = 160 stones (or 2240 pounds) Note: the different spellings of tonne (metric) and ton (imperial). Volume:1 gallon = 8 pints ConversionYou need to know the approximate conversions between some of the metric and imperial units. Here are the main ones: Kilometres and Miles: Miles to km - Multiply by 1.6 km to Miles - Multiply by 0.62 Kilograms and Pounds: kg to Pounds - Multiply by 2.2Pounds to kg - Multiply by 0.45 Litres and Gallons: Litres to Gallons - Multiply by 0.22Gallons to Litres - Multiply by 4.55Metres, centimetres, feet and inches: Inch to cm - Multiply by 2.54 cm to Inch - Multiply by 0.39 Now try some conversions for yourself/**/