Units Conversion |
(send me a hint if you
think something is missing or in error)
No responsibility assumed for the correctness.
Quantity | Also Equals | Equal to | SI Unit, comments |
---|---|---|---|
Length | meter (m) | ||
1 mm | .03937 in. | exact by definition in USA until 1959 | |
1 inch (in) | 25.4 mm | exact by definition in UK since 1933, and USA since 1959 | |
1 foot (ft) | 12 in | .3048 m | exact |
1 yard (yd) | 3 ft | .9144 m | exact |
1 meter | 3.28084 ft | ||
1 mile | 1760 yards | 1.609344 km | exact |
1 nautical mile | 1852 m | exact by definition | |
Area | square meter (m^{2}) | ||
1 sq.inch | 645.16 mm^{2} | exact | |
1 dm^{2} | 15.500031 sq.inch | ||
1 sq.foot | .0929034 m^{2} | exact | |
1 sq.yard | .83612736 m^{2} | exact | |
Volume | cubic meter (m^{3}) | ||
1 cm^{3} | .06102 cu.in. | ||
1 cu.in | 16.387064 cm^{3} | exact | |
1 cu.foot | 28.317 liters | ||
1 US pint | .473176 liter | ||
1 imperial pint | .56825 liter | ||
1 liter | 1 dm^{3} | .264172 US gallon | |
1 US gallon (liquid) | 8 US pints, 231 cu.in | 3.785411784 liters | exact |
1 imperial gallon | 8 imp. pints (10 lbs of water) | 4.54609 liters | |
Mass | kilogram (kg) | ||
1 ounce (oz) | 28.349523 grams | ||
1 pound (lb) | 16 ounces | .45359237 kg | exact |
1 kg | 2.20462 pounds | (Originally the mass of 1
dm^{3} [liter] of water at a certain temperature; Now the mass of a prototype in Paris) | |
Density | kilogram per cubic meter (kg/m^{3}) | ||
1 g/cm^{3} | 1.730 ounces per cu.in | (for most materials) | |
1 g/dm^{3} | .06243 pounds per cu.ft | (for balsa) | |
Surface Weight | kilogram per square meter | ||
1 oz. per sq.yd | 33.906 g/m^{2} | (The units we use for covering materials) | |
1 g/m^{2} | .0295 oz. per sq.yd | ||
Speed | meter per second (m/s) | ||
1 km/h | .62137 mph | ||
1 mph | 1.609344 km/h | ||
1 mph | .44704 m/s | ||
1 m/s | 3.6 km/h | ||
1 m/s | 2.236932 mph | ||
Mach 1 | speed of sound | 1225.1 km/h @ 15 °C | |
c | speed of light in vacuum | 299792458 m/s | exact by definition |
Pressure, Stress | pascal (Pa) = Newton per square meter (N/m^{2}) | ||
1 torr | 1 mm Hg | 133 Pa | |
1 psi | 6894.757 Pa | ||
1 bar | 100 000 Pa | 14.504 psi | |
1 kgf/cm^{2} | 98 066.5 Pa | ||
1 atmosphere | 101325 Pa | exact by definition | |
1 atmosphere | 760 torr | 14.696 psi | |
Force | Newton (N) | ||
1 N | .1019716 kgf | ||
1 N | .2248 pound force | ||
Energy | joule (J) = Newtonmeter (Nm) = Wattsecond (Ws) | ||
1 foot pound (ft-lb) | 1.355 818 J | ||
1 kJ | 1 kWs | .9478 BTU | |
Power | watt (W) = Joule per second (J/s) | ||
1 horsepower (hp) | 1980000 ft-lbs per hr | 745.70 W | |
1 metric hp | 75 kgm/s | 735.5 W | |
1 BTU/sec | 1054.118 W | ||
Temperature | Conversion Formula | Kelvin (K) or degree Celsius (°C) | |
{°F} | {°F} = {°C} * 9 / 5 + 32 | ||
{°C} | {°C} = ({°F} - 32) * 5 / 9 | ||
{K} | {K} = {°C} + 273.15 |