Conversion Factors
Length
1 inch = 25.4 mm
Area
1 square inch = 6.4516 cm2

1 foot = 0.3048 m

1 square foot = 9.290 304 dm2

1 yard = 0.9144 m

1 square yard = 0.836 127 4 m2

1 mile = 1.609 344 km

1 acre = 0.404 685 6 ha

1 nautical mile = 1.853 km

1 square mile = 2.589 988 km2

1 millimetre = 0.03937 inch

1 square centimetre = 0.1550 in2

1 centimetre = 0.3937 inch

1 square metre = 1.1960 yd2

1 metre = 1.0936 yard

1 hectare = 2.4711 acres

1 kilometre = 0.6214 mile

1 square kilometre = 0.3861 mile2

Volume
1 cubic inch = 16.387 064 cm3
Mass
1 ounce (437.5 grain) = 28.349 523 g

1 cubic foot = 28.316 85 dm3

1 pound = 0.453 592 37 kg

1 cubic yard = 0.764 555 m3

1 stone (14 lb) =   6.3503 kg

1 Imperial fluid ounce = 28.413 062 mL

1 hundredweight (112 lb) = 50.802 kg

1 Imperial pint = 0.5683 L

1 short ton (2000 lb) = 907.184 74 kg

1 Imperial gallon = 4.546 090 L

1 long ton (UK) = 1.016 tonne

1 US ounce = 29.574 mL

1 milligram = 0.0154 grain

1 US pint = 0.4731 L

1 gram = 0.0353 oz

1 US gallon = 3.7854 L

1 kilogram = 2.2046 lb

1 cubic centimetre = 0.0610 in3

1 tonne = 0.9842 ton

1 cubic decimetre = 0.0353 ft3


1 cubic metre = 1.3080 yd3
Power
1 hosepower (mechanical) = 745.6999 W

1 litre = 1.76 Imperial pint

1 horsepower (electrical) = 746 W

1 hectolitre = 21.997 Imperial gallons



Speed
1 mile / hour = 0.44704 m/s
Force
1 pound-force = 4.448 222 N

                    = 1.609 344 km/h

1 kilogram-force = 9.80665 N

Pressure
1 lb-force / inch2 (psi) = 6.894757 kPa
Energy
1 British Thermal Unit (BTU) = 1055.06 J

1 inch of Hg = 3.38639 kPa

1 Foot pound-force = 1.355818 J

1 mm of Hg = 133.322 Pa

1 calorie = 4.1868 J

1 stan. atmosphere (atm) = 101.325 kPa

1 kilowatt hour = 3.6 MJ