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DICTIONARY OF UNITS / MEASUREMENTS

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UK (Imperial) System of Measurements
        Length                                     Area                         

  12 inches   = 1 foot                144 sq. inches = 1 square foot

   3 feet     = 1 yard                9 sq. feet   = 1 square yard

  22 yards    = 1 chain               4840 sq. yards  = 1 acre

  10 chains   = 1 furlong             640 acres      = 1 square mile

   8 furlongs = 1 mile

5280 feet     = 1 mile

1760 yards    = 1 mile                        Capacity

                                                   20 fluid ounces = 1 pint

        Volume                                4 gills         = 1 pint

1728 cu. inches = 1 cubic foot          2 pints        = 1 quart

27 cu. feet   = 1 cubic yard              4 quarts      = 1 gallon (8 pints)

 

        Mass (Avoirdupois)

437.5 grains = 1 ounce                                    Troy Weights

16 ounces   = 1 pound (7000 grains)     24 grains        = 1 pennyweight

14 pounds   = 1 stone                      20 pennyweights  = 1 ounce (480 grains)

8 stones   = 1 hundredweight [cwt]     12 ounces        = 1 pound (5760 grains)

20 cwt      = 1 ton (2240 pounds)

 

      Apothecaries' Measures             Apothecaries' Weights

 20 minims      = 1 fl.scruple                 20 grains   = 1 scruple

  3 fl.scruples = 1 fl.drachm                  3 scruples = 1 drachm

  8 fl.drachms  = 1 fl.ounce                  8 drachms  = 1 ounce (480 grains)

 20 fl.ounces   = 1 pint                        12 ounces   = 1 pound (5760 grains)

The old Imperial (now UK) system was originally defined by three standard measures - the yard, the pound and the gallon which were held in London. They are now defined by reference to the S I measures of the metre, the kilogram and the litre. These equivalent measures are exact.

1 yard = 0.9144 metres - same in US
1 pound = 0.453 592 37 kilograms - same in US
1 gallon = 4.546 09 litres - different in US

Note particularly that the UK gallon is a different size to the US gallon so that NO liquid measures of the same name are the same size in the UK and US systems.
Also that the ton(UK) is 2240 pounds while a ton(US) is 2000 pounds. These are also referred to as a long ton and short ton respectively.

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