# Pound-foot (torque)

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Pound-foot
Unit system British Gravitational System, English Engineering Units
Unit of Torque
Symbol lbf∙ft
Unit conversions
1 lbf∙ft in ...... is equal to ...
SI units    ≈ 1.355818 N⋅m[1]
Gravitational metric system    ≈ 0.1382550 kgf⋅m

A pound-foot (lbf⋅ft or lb⋅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.[2] Conversely one pound-foot is the moment about an axis that applies one pound-force at a radius of one foot.

One pound-foot is approximately 1.355818 newton meters in SI Units.[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.[3] However, the torque unit is often still referred to as the foot-pound (ft⋅lbf).[4]

## References

1. ^ a b "Appendix B.9: Factors for units listed by kind of quantity or field of science". NIST Guide to the SI. National Institute of Standards and Technology. September 7, 2016. Retrieved 2018-07-09.
2. ^ Pickerill, Ken (2009). Today's Technician: Automotive Engine Performance Classroom Manual and Shop Manual (5th ed.). Cengage Learning. pp. 50–51. ISBN 1111782385.
3. ^ Arthur Mason Worthington (1900). Dynamics of rotation : an elementary introduction to rigid dynamics (3rd ed.). Longmans, Green, and Co. p. 9.
4. ^ Erjavec, Jack. Manual Transmissions & Transaxles: Classroom manual. p. 38. ISBN 978-1-4354-3933-7.

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