|Unit system||British Gravitational System, English Engineering Units|
|1 lbf∙ft in ...||... is equal to ...|
|SI units||≈ 818 N⋅m1.355|
|Gravitational metric system||≈ 0.1382550 kgf⋅m|
A pound-foot (lbf⋅ft) is a unit of torque (a pseudovector). One pound-foot is the torque created by one pound of force acting at a perpendicular distance of one foot from a pivot point. Conversely one pound-foot is the moment about an axis that applies one pound-force at a radius of one foot.
The value in SI units is given by multiplying the following approximate factors:
This gives the conversion factor:
The name "pound-foot", intended to minimize confusion with the foot-pound as a unit of work, was apparently first proposed by British physicist Arthur Mason Worthington. However, the torque unit is often still referred to as the foot-pound (ft⋅lbf).
Similarly, an inch-pound (though should be more correctly as pound-inch) is the torque of one pound of force applied to one inch of distance from the pivot, and is equal to 1/ of a pound-foot. It is commonly used on torque wrenches and torque screwdrivers for setting specific fastener tension.
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