Foot-Pounds to Joules Converter

About this calculator

One foot-pound equals exactly 1.3558179483 joules — an exact conversion factor derived from the standard definitions of the foot (0.3048 m exactly) and the pound-force (based on standard gravity, 9.80665 m/s²), so converting in either direction is a straightforward multiplication or division by that constant.

Engineers, physics students, and firearms enthusiasts convert between the two units because foot-pounds (ft·lb) are the customary unit for torque and energy in the US and UK — used for torque-wrench settings, the muzzle energy of ammunition, and the work done by a falling weight — while joules are the SI unit used in most of the rest of the world's engineering specifications and physics coursework.