Conversion Factors

Throughout the text you will find an awkward mixture of metric units and the foot/pound/gallon system still used extensively in North America. Different individuals, depending on age, occupation and whether they live in a British Commonwealth country or the United States, will use a different mixture of the two systems. So, for everyone's convenience, a list of conversion factors is provided below.


1 Imperial gallon 1 Imp fluid ounce 20 Imp fluid ounces

1 U.S. gallon 1 US fluid ounce 16 US fluid ounces

1 litre

1 US pint

4.55 litres 28.4 millilitres 568.1 millilitres

3.78 litres 29.6 millilitres 473.6 millilitres

= 35 fluid ounces Imp

(TIP Instead of converting to or from Imperial to US units for volume, just count all measures in fluid ounces - they are practically equivalent, e.g. 1 US quart = 32 US or 32 Imp fluid ounces (near enough)




1 pound (lb) 1 ounce(oz) 1 kilogram (kg) 1 gram (g)

1 inch 1 foot

1 centimetre 1 metre

454 grams 28.4 grams 2.2 pounds 0.035 ounces

2.54 cm 30.48 cm 0.39 inches 39.37 inches


General: 1 atmosphere

1 psi

14.7 lbs/ (psi) 29.9 inches of mercury 760 mm " " 101.3 kilopascals (kPa) 6.9 kPa

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