The newton-meter (N·m) is the SI unit of torque, measuring the rotational force produced when one newton of force is applied at a one-meter distance from the pivot point. It is the standard unit for engine torque specifications, bolt tightening requirements, and mechanical design worldwide. One newton-meter equals approximately 0.7376 pound-feet.

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.