These are all rough approximations; for more accurate information, see Conversion of units.

Volume:

1 liter 2 pints half liter 1 pint 4 liters 1 gallon 6 U.S. gallons 5 imperial gallonsLength:

1 inch 2.5 cm 4 inch 10 cm 3 cm just over 1 inch (just over, round down conversion) 10 cm 4 inch (just under, round up conversion) 1 meter 1 yard (just over) 1 meter 3 feet 30 cm 1 foot 1 km half a mile (just over, round down conversions) 3 miles 5 km (just under, round up conversions)Mass:

1 kg 2 pounds 1 lb half a kilogram 1 oz 30 g 7 oz 200 gTemperatures:

- Fahrenheit to Celsius -- subtract 30 and divide by 2
- Celsius to Fahrenheit -- multiply by 2 add 25