Units used in England and the USA and their conversion into SI units
| Units of length |
| Mile |
≈ 1.609 km |
| Nautical mile |
1.852 km (exact) |
| Cable |
185.2 m (exact) |
| Yard |
914.4 mm (exact) |
| Foot |
304.8 mm (exact) |
| Inch |
25.4 mm (exact) |
| Large line |
2.54 mm (exact) |
| Small line |
≈ 2.12 mm |
| Units of area |
| Acre |
≈ 4046.9 m2 |
| Square yard |
≈ 0.836 m2 |
| Square foot |
≈ 929 cm2 |
| Square inch |
≈ 645.2 mm2 |
| Square line (large) |
≈ 6.45 mm2 |
| Units of volume and capacity |
| Register ton |
≈ 2.8 m3 |
| Cubic yard |
≈ 0.76 m3 |
| Cubic foot |
≈ 28.3 dm3 |
| Cubic inch |
≈ 16.4 cm3 |
| Bushel (England) |
≈ 36.4 l |
| Bushel (USA) |
≈ 35.2 l |
| Gallon (England) |
≈ 4.5 l |
| Gallon, liquid (USA) |
≈ 3.8 l |
| Barrel, oil (USA) |
≈ 159 l |
| Gallon, dry (USA) |
≈ 4.4 l |
| Pint (England) |
≈ 568.3 ml |
| Dry pint (USA) |
≈ 550.6 ml |
| Liquid pint (USA) |
≈ 473.2 ml |
| Units of mass |
| Ton (long) |
≈ 1.016 t |
| Ton (short) |
≈ 0.907 t |
| Hundredweight (long) |
≈ 50.8 kg |
| Hundredweight (short) |
≈ 45.4 kg |
| Pound (avoirdupois) |
≈ 453.6 g |
| Pound (apothecary) |
≈ 373.2 g |
| Ounce |
≈ 28.35 g |
| Dram (England) |
≈ 1.77 g |
| Grain |
≈ 64.8 mg |
| Units of velocity |
| Foot per second |
≈ 0.30 m/s |
| Mile per hour |
≈ 1.609 km/h |
| Knot (nautical mile per hour) |
1.852 km/h (exact) ≈ 0.51 m/s |