The newton (N) is the SI base unit of force, defined as the force needed to accelerate one kilogram of mass at one meter per second squared. Named after Isaac Newton, it is the fundamental unit in mechanics, structural engineering, and physics worldwide. One newton equals approximately 0.2248 pound-force.

Ounce-force (ozf) equals approximately 0.278 newtons, the imperial unit for small force measurements in precision engineering, spring calibration, and micro-mechanical testing. It is particularly useful for measuring trigger pull weights, small spring tensions, and delicate instrument calibrations. One ounce-force equals about 1/16 of a pound-force.