Conversion factors

Imperial to SI SI to Imperial
Length 1.609 mile kilometre km 0.6215
0.9144 yard metre m 1.094
0.3048 foot metre m 3.281
25.4 inch millimetre mm 0.0394
Area 2.590 sq mile sq kilometre km2 0.3861
0.4047 acre hectare ha 2.471
0.8361 sq yard sq metre m2 1.196
0.0929 sq foot sq metre m2 10.7639
645.16 sq inch sq millimetre mm2 0.00155
Volume 0.7646 cubic yard cubic metre m3 1.3079
0.02832 cubic foot cubic metre m3 35.31
16.39 cubic inch cubic millimetre mm3 0.000061
Capacity 28.32 cubic foot litre l 0.03531
0.01639 cubic inch litre l 61.0128
16.39 cubic inch millilitre ml 0.06102
4.546 UK gallon litre l 0.21998
28.4125 fluid ounce mililitre ml 0.0352
Mass 1.016 ton tonne t 0.98425
0.4536 pound kilogram kg 2.20458
453.6 pound gram g 0.002205
28.35 ounce gram g 0.03527
Density 16.0185 pound/ft3 kilogram/m3 kg/m3 0.06243
Force 4.4482 pound force newton N 0.22481
14.59 pound f/foot newton/metre N/m 0.06854
Pressure, stress
4.882 pound/ft2 kilogram/m2 kg/m2 0.2048
107.252 ton f/ft2 kilonewton/m2 kN/m2 0.009324
47.8803 pound f/ft2 newton/m2 N/m2 0.02088
6894.76 pound f/in2 newton/m2 N/m2 0.000145
Imperial to SI SI to Imperial
Energy 3.6 kilowatt hour megajoule MJ 0.27777
Heat 1 055.0 Btu joule J 0.000948
Heat flow
0.000293 Btu/h kilowatt kW 3415.0
Heat transfer
5.67826 Btu/ft2
h °F watt/m2 °C W/m2 °C 0.17611
Thermal conductivity
0.144228 Btu in/ft2
h °F watt/m °C W/m °C 6.93347
Cost 0.0929 £/sq foot £/sq metre £/m2 10.7639
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