Pound-foot (lb·ft) is the imperial unit of torque used primarily in the United States and UK for automotive engine specifications and mechanical fastener tightening. Car enthusiasts discuss engine output in lb·ft, and torque wrenches in the US are calibrated in this unit. One pound-foot equals approximately 1.356 newton-meters.

Pound-inch (lb·in) is an imperial torque unit for smaller precision applications, commonly used for electronics assembly, small engine specifications, and instrument calibration. Torque screwdrivers and precision fastener specifications in the US typically use lb·in. One pound-inch equals approximately 0.113 newton-meters or 1/12 of a pound-foot.