A pound-foot (lb·ft or lbf·ft) is a unit of torque (a pseudovector). One pound-foot is the torque created by one pound force acting at a perpendicular distance of one foot from a pivot point.
One pound-foot is exactly 1.3558179483314004 newton meters.[note 1]
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, foot-pound (ft·lb or ft·lbf) is also sometimes used interchangeably with "pound-foot" to express torque.
See also 
- ^ This is the product of the international pound (0.45359237 kg), standard gravity (9.80665 m/s2) and the international foot (0.3048 m)