Kilogram-force (kgf) is a non-SI unit defined as the gravitational force on one kilogram of mass at standard gravity, equal to exactly 9.80665 newtons. It is commonly used in some engineering fields and in countries transitioning from metric technical units to SI. One kilogram-force equals approximately 2.205 pound-force.

The dyne (dyn) is a centimeter-gram-second (CGS) unit of force equal to exactly 0.00001 newtons, used primarily in physics for small-scale force calculations. It represents the force needed to accelerate one gram of mass at one centimeter per second squared, and appears in surface tension and electromagnetic force measurements. One dyne equals exactly 10 micro-newtons.