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The Imperial (U.K.) System of Measurements
| category |
units and relationship |
| length |
12 inches |
= |
1 foot |
|
3 feet |
= |
1 yard |
|
22 yard |
= |
1 chain |
|
10 chains |
= |
1 furlong |
|
8 furlong |
= |
1 mile |
|
5280 feet |
= |
1 mile |
|
1760 yards |
= |
1 mile |
| |
| area |
144 square inches |
= |
1 square foot |
|
9 square feet |
= |
1 square yard |
|
4840 square yards |
= |
1 acre |
|
640 acres |
= |
1 square mile |
| |
| Volume |
1728 cubic inches |
= |
1 cubic foot |
|
27 cubic feet |
= |
1 cubic yard |
| |
| Capacity |
20 fluid ounces |
= |
1 pint |
|
4 gills |
= |
1 pint |
|
2 pints |
= |
1 quart |
|
4 quarts |
= |
1 gallon |
|
8 pints |
= |
1 gallon |
| |
| Mass (Avoirdupois) |
437.5 grains |
= |
1 ounce |
|
16 ounces |
= |
1 pound |
|
14 pound |
= |
1 stone |
|
8 stones |
= |
1 hundredweight [cwt] |
|
20 cwt |
= |
1 ton |
| |
| Troy Weights |
24 grains |
= |
1 pennyweight |
|
20 pennyweights |
= |
1 ounce |
|
12 ounces |
= |
1 pound |
| |
| Apothecaries' Measures |
20 minims |
= |
1 fl.scruple |
|
3 fl.scruples |
= |
1 fl.drachm |
|
8 fl.drachms |
= |
1 fl.ounce |
|
20 fl.ounces |
= |
1 pint |
| |
| Apothecaries' Weights |
20 grains |
= |
1 scruple |
|
3 scruples |
= |
1 drachm |
|
8 drachms |
= |
1 ounce |
|
12 ounces |
= |
1 pound |
| |
Notes:
- The difference between volume and capacity is there for historical reasons only
- 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
- 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 |
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