Regulations 2 and 3
| Relevant imperial unit | Corresponding metric unit | Metric equivalent |
|---|---|---|
| Length | ||
| inch | centimetre | 2.54 centimetres |
| hand | metre | 0.1016 metre |
| foot | metre | 0.3048 metre |
| yard | metre | 0.9144 metre |
| fathom | metre | 1.8288 metres |
| chain | metre, | 20.1168 metres |
| furlong | kilometre | 0.201168 kilometre |
| mile | kilometre | 1.609344 kilometres |
| nautical mile (UK) | metre | 1853 metres |
| Area | ||
| square inch | square centimetre | 6.4516 square centimetres |
| square foot | square metre | 0.09290304 square metre |
| square yard | square metre | 0.83612736 square metre |
| rood | square metre | 1011.7141056 square metres |
| acre | square metre | 4046.8564224 square metres |
| square mile | square kilometre | 2.589988110336 square kilometres |
| Capacity | ||
| fluid ounce | millilitre | 28.4130625 millilitres |
| gill | litre | 0.1420653125 litre |
| pint | litre | 0.56826125 litre |
| quart | litre | 1.1365225 litres |
| gallon | litre | 4.54609 litres |
| Pressure | ||
| inch of water | pascal | 249.08891 pascals |
| Mass | ||
| grain | gram | 0.06479891 gram |
| dram | gram | 1.7718451953125 grams |
| ounce (avoirdupois) | gram | 28.349523125 grams |
| troy ounce | gram | 31.1034768 grams |
| pound | kilogram | 0.45359237 kilogram |
| stone | kilogram, | 6.35029318 kilograms |
| quarter | kilogram | 12.70058636 kilograms |
| cental | kilogram | 45.359237 kilograms |
| hundredweight | kilogram, | 50.80234544 kilograms |
| ton | tonne | 1.0160469088 tonnes |
| Force | ||
| pound-force | newton | 4.4482216152605 newtons |
| ton-force | kilonewton | 9.96401641818352 kilonewtons |
| Volume | ||
| cubic inch | cubic centimetre | 16.387064 cubic centimetres |
| cran | cubic decimetre | 170.478375 cubic decimetres |
| cubic foot | cubic metre | 0.028316846592 cubic metre |
| bushel | cubic metre | 0.03636872 cubic metre |
| cubic yard | cubic metre | 0.764554857984 cubic metre |
| Power | ||
| horsepower | kilowatt | 0.74569987158227022 kilowatt |
| Temperature | ||
| degree Fahrenheit | degree Celsius | [See regulation 3(4)] |
| Energy | ||
| foot pound-force | joule | 1.3558179483314004 joules |
| British thermal unit | kilojoule | 1.05505585257348 kilojoules |
| therm | megajoule | 105.505585257348 megajoules |
| Illuminance | ||
| foot candle | lux | 10.763910416709 lux |
| Speed | ||
| knot (UK) | metres per second | 0.51477 metres per second |