Common unit of mechanical power, one HP is the rate of work required to raise 33,000 pounds one foot in one minute.
One Imperial Horsepower Equals
33,000 foot pounds per minute.
36 inch pounds torque at 1750 RPM.
1.014 Metric Horsepower. (PS)
42.4 BTU per Minute.
Torque is a twisting force. Torque causes rotation of a shaft, TNmechanical2 or it will set up a twist in a stationary shaft. It is generally expressed in foot pounds or in inch pounds. Torque is measured by the load or pull and by the distance of the pull from the center of a shaft.
Calculation Examples A cable wrapped around a 6" dia. drum must lift a 2500 pound weight. The drum rotates at 30 RPM.
To Calculate HP:
To Calculate T:
Metric (SI) Standards
The basic unit power measurement in the metric (SI) system is the Watt. 1000 Watts = 1 Kilowatt (kW)
Torque (M) Torque is a twisting force. Torque causes rotation of a shaft, or it will set up a twist in a stationary shaft. It is generally expressed in Newton-Meters.
SI Symbols M = Torque P = Power in Kilowatts N = Newton Kfgm = Kilogram force meter m = Meter N-m = Torque in Newton-Meters = Multiplication Symbol
Calculation Examples A cable wrapped around a .5 meter dia. drum must lift 5000 kilograms of weight. The drum rotates 50 RPM.
To Calculate P: Power in Kilowatts
To Calculate M: Torque in Newton-Meters
1 Kilowatt =
1 N-m =
1 kgfm =
1 lb ft =
1 lb in =
1.341 Imperial Horsepower
.10197 kgfm .73756 lb ft 8.8507 lb in
9.807 N-m 7.233 lb ft 86.796 lb in
1.356 N-m .1883 kgfm 12 lb in
.1129 N-m .0115 kgfm .083 lb ft
Important: Due to our policy of continuing development, all specifications are subject to change without notice. Users of these products are responsible for ensuring their suitability for the application in which they are being used.