Length
12 inches = 1 foot
3 feet = 1 yard
22 yards = 1 chain
10 chains = 1 furlong
8 furlongs = 1 mile
5280 feet = 1 mile
1760 yards = 1 mile
Capacity
20 fluid ounces = 1 pint
4 gills = 1 pint
2 pints = 1 quart
4 quarts = 1 gallon (8 pints)
Troy Weights
24 grains = 1 pennyweight
20 pennyweights = 1 ounce (480 grains)
12 ounces = 1 pound (5760 grains)
Apothecaries' Weights
20 grains = 1 scruple
3 scruples = 1 drachm
8 drachms = 1 ounce (480 grains)
12 ounces = 1 pound (5760 grains) |
Area
144 sq. inches = 1 square foot
9 sq. feet = 1 square yard
4840 sq. yards = 1 acre
640 acres = 1 square mile
Volume
1728 cu. inches = 1 cubic foot
27 cu. feet = 1 cubic yard
Mass (Avoirdupois)
437.5 grains = 1 ounce
16 ounces = 1 pound (7000 grains)
14 pounds = 1 stone
8 stones = 1 hundredweight [cwt]
20 cwt = 1 ton (2240 pounds)
Apothecaries' Measures20 minims = 1 fl.scruple
3 fl.scruples = 1 fl.drachm
8 fl.drachms = 1 fl.ounce
20 fl.ounces = 1 pint |
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 liters - 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. |
