| UNIT A | UNIT B | S P A C E | UNIT C | UNIT D | ||
| 1 acre | = 0.4047 | hectares | 1 kg | = 35.3 | ounces | |
| 1 sq.acre | = 1/ 247 | sq. km | 1 kg | = 2.2046 | pounds | |
| 1 sq.acre | = 4047 | sq. m | 1 kg | =1 / 1000 | tons * | |
| 1 sq.acre | = 1/ 640 | sq. miles * | 1 kg | = 1/ 1016 | tons (UK/long) | |
| 1 barrel (oil) | = 1/ 6.29 | cub.metres | 1 kg | = 1/ 907 | tons (US/short) | |
| 1 barrel (oil) | = 34.97 | gallons (UK) | 1 km | = 1000 | meters * | |
| 1 barrel (oil) | = 42 | gallons (US) * | 1 km | = 0.6214 | miles | |
| 1 barrel (oil) | = 159 | litters | 1 liter | = 61.02 | cub.inches | |
| 1 cm | = 1/ 30.48 | feet * | 1 liter | = 0.2200 | gallons (UK) | |
| 1 cm | = 1/ 2.54 | inches * | 1 liter | = 0.2642 | gallons (US) | |
| 1 cm | = 1/ 100 | meters * | 1 liter | = 1.760 | pints (UK) | |
| 1 cm | = 10 | millimeters * | 1 liter | = 2.113 | pints (US liq.) | |
| 1 cubic cm | = 0.06102 | cubic inches | 1 m | = 1/ 0.9144 | yards * | |
| 1 cubic cm | = 1/ 1000 | liters * | 1 m | = 100 | cm * | |
| cubic cm | = 1 | milliliter * | 1 mile | = 1.609 | km | |
| 1 cubic foot | = 1728 | cubic inches * | 1 millimeter | = 1/ 25.4 | inches * | |
| 1 cubic foot | = 0.0283 | cubic meters | 1 ounce | = 28.35 | grams | |
| 1 cubic foot | = 1/ 27 | cubic yards * | 1 pint (UK) | = 0.5683 | liters | |
| 1 cubic foot | = 6.229 | gallons (UK) | 1 pint (UK) | = 1.201 | pints (US liq.) | |
| 1 cubic foot | = 7.481 | gallons (US) | 1 pint (US liq.) | = 0.4732 | liters | |
| 1cubic foot | = 28.32 | liters | 1 pint (US liq.) | = 0.8327 | pints (UK) | |
| 1 cubic inch | = 16.39 | cubic cm | 1 pound | = 0.4536 | kg | |
| 1 cubic inch | = 0.01639 | liters | 1 pound | = 16 | ounces * | |
| 1 cubic meter | = 35.31 | cubic feet | ||||
| 1 sq. cm | = 0.1550 | sq. inches | ||||
| 1 foot | = 30.48 | centimeters * | 1 sq. feet | = 144 | sq. inches * | |
| 1 foot | = 0.3048 | meters * | 1 sq. feet | = 0.0929 | sq. m | |
| 1 foot | = 1/ 3 # | yards * | 1 sq. inches | = 6.4516 | sq. cm * | |
| 1 fl.ounce (UK) | = 0.961 | fl.ounces (US) | 1 sq. inches | = 1/ 144 | sq. feet * | |
| 1 fl.ounce (UK) | = 28.41 | milliliters | 1 sq. km | = 247 | acres | |
| 1 fl.ounce (US) | = 1.041 | fl.ounces (UK) | 1 sq. km | = 100 | ha * | |
| 1 fl.ounces (US) | = 29.57 | milliliters | 1 sq. km | = 0.3861 | sq. miles | |
| 1 gallon | = 8 | pints * | 1 sq. m | = 1/ 4047 | acres | |
| 1 gallon (UK) | = 0.1605 | cubic feet | 1 sq. m | = 1/ 10 000 | ha * | |
| 1 gallon (UK) | = 1.2009 | gallons (US) | 1 sq. m | = 10.76 | sq. feet | |
| 1 gallon (UK) | = 4.54609 | liters * | 1 sq. m | = 1.196 | sq. yards | |
| 1 gallon (US) | = 0.1337 | cubic feet | 1 sq. mile | = 640 | acres * | |
| 1 gallon (US) | = 0.8327 | gallons (UK) | 1 sq. mile | = 259 | ha | |
| 1 gallon (US) | = 3.785 | liters | 1 sq. mile | = 2.590 | sq. km | |
| 1 gram | = 1/ 1000 | kilograms * | 1 sq. yard | = 1/ 1.196 | sq. m | |
| 1 gram | = 1/ 28.35 | ounces | 1 tone | = 1000 | kg * | |
| 1 hectare | = 2.471 | acres | 1 tone | = 0.9842 | tons (UK/long) | |
| 1 hectare | = 1/ 100 | sq. km * | 1 tone | = 1.1023 | tons (US/short) | |
| 1 hectare | = 10000 | sq. m | 1 tone (UK/long) | = 1016 | kg | |
| 1 hectare | = 1/ 259 | sq. miles | 1 tone (UK/long) | = 1.016 | tons | |
| 1 hectare | = 11 960 | sq. yards | 1 tone (US/short) | = 907.2 | kg | |
| 1 inch | = 1/ 12 | feet * | 1 yard | = 0.9144 | m * | |
| 1 inch | = 2.54 | cm * | 1 tone (US/short) | = 0.9072 | tons | |
| 1 lbf | = 4.4482 | N | 1 kgf | = 9.8065 | N | |
| 1 N/sq.m | = 1 | Pa | 1 bar | = 100000 | Pa | |
| 1 lbs./sq.inch | = 1 | PSI | 1 lbs./sq.inch | =6.89475 | KPa | |
| 1 ft lbf | = 1.356 | J | 1 kW h | = 3600 | KJ | |
| 1 therm | = 105.51 | MJ | 1 kcalorie | = 4.1868 | KJ | |
| 1 BTU | = 1.0551 | KJ | 1 lbf ft | =1.3558 | N m | |
| 1 hp | =0.745 9 | kW | ft.lbf /s | = 1.356 | W | |
| 1 ft/s | = 0.3048 | m/s | 1 mi/hr | = 1.6093 | km/hr |
- / means 'divide by' - * means it is an exact value