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The pound-force is a non- SI unit of force or weight (properly abbreviated "lbf" or "lbf"). The pound-force is equal to a mass of one pound multiplied by the standard acceleration of gravity (which is defined as exactly 9.806 65 m/ s2, or exactly 196,133/6096 ft/ s2, or approximately 32.174 05 ft/s2).In SI units, a pound-force is equal to exactly 4.448 221 615 260 5 newtons.
A more complete discussion of U.S. customary units of force and mass is given at pound.
Units of force
Imperial units
US customary units