Appendix C: Unit Conversions from English System to SI System

The following are useful when converting from the English system to the SI system:

Length:1 in. = 2.54 cm = 0.0245 m
 1 ft = 30.5 cm = 0.305 m
 1 mile = 1609 m
Area:1 square mile = 2.59 × 106 m2
 1 in.2 = 0.000645 m2
 1 in.2 = 6.45 cm2
Volume:1 ft3 = 0.0283 m3
Linear speed:1 ft/s = 0.305 m/s = 30.3 cm/s
 1 mph = 0.447 m/s
 1 in./s = 0.0254 m/s = 2.54 cm/s
Rotational speed:1 rev/min = 0.105 rad/s = 6 deg/s
Force:1 lb = 4.45 N
Power:1 hp = 746 W = 0.746 kW
Torque:1 ft-lb = 1.356 N-m
Magnetic flux:1 line = 1 maxwell = 10−-8 Wb
 1 kiloline = 1000 maxwells = 10−-5 Wb
Magnetic flux density: ...

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