100 centimetres = 1 metre (100cm = 1m)
1000 millimetres = 1 metre (1000mm = 1m)

1000 milliseconds = 1 second 1000ms = 1s

1000 grams = 1 kilogram (1000g =1kg)
1000 milligrams = 1 gram (1000mg = 1g)

1 million cubic centimetres = 1 cubic metre 1000 000 cm³ = 1 m³

1 millilitre = 1 cubic centimetre (1ml = 1cm³⁾1000 millilitres = 1 litre (1000ml = 1l)

1000 square centimetres = 1 square metre (1000 cm² = 1m²⁾

1000 milliamps = 1 amp (1000mA = 1 A)

1000 millivolts = 1 volt (1000mV = 1V)

Degrees celcius to degrees fahrenheight
C = (F-32 ) x 5 ÷ 9

Degrees fahrenheight to degrees celcius
F = C x 9 ÷5 + 32

Miles per hour to kilometres per hour
mph = kph x 5 ÷8

Kilometres per hour to miles per hour
kph = mph x 8÷5

eg 50 mph = 80 kph

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