| Units of Length | |
| 1 inch = 2.54 centimetres | 1 cm = 0.3938 inches |
| 1 yard = 0.9144 metres | 1 metre = 1.093 yards |
| 1 mile = 1.609 km | 1 kilometre = 0.6213 miles |
| 1 nautical mile = 1.852 kilometres | 1 kilometre = 0.5399 nautical miles |
| 1 fathom (6 feet) = 1.828 metres | 1 metre = 0.5468 fathoms |
| 1 mile = 5280 feet | 1 nautical mile = 6076.16 feet |
| Units of Weight | |
| 1 ounce = 28.349 grams | 1 gram = 0.03527 ounces |
| 1 pound = 453.592 grams | 1 kilogram = 2.204 pounds |
| 1 bale (cotton in India) = 170 kilograms | |
| Units of Volume | |
|---|---|
| 1 gallon = 3.785 litres | 1 litre = 0.264 gallons |
| 1 litre = 1000 cubic centimetres | 1 cc = 0.001 litre |
| 1 litre = 2.1134 pints | 1 pint = 0.4731 litre |
| 1 barrel (oil) = 158.99 litres | 1 barrel = 42 US gallons |
| Units of Area | |
|---|---|
| 1 acre = 4046.85 square metres | 1 square metre = 0.000247 acres |
| 1 hectare = 10,000 square metres | 1 square metre = 0.0001 hectare |
| Units of Quantity | |
|---|---|
| 1 quire = 25 sheets | 1 ream = 500 sheets |
| 1 bundle = 1,000 sheets | 1 bale = 5,000 sheets |
| 1 dozen = 12 units | 1 gross = 12 dozen |