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Sources and Accuracy
Force conversions use newton as the reference unit and include SI, metric force, and imperial force units.
Displayed results are rounded for readability. The calculator keeps enough precision for everyday use and switches to scientific notation for very large or very small values. Last reviewed: 2026-05-21.
About These Units
pound-force [lbf]
Definition
The pound-force is a customary force unit based on the force exerted by gravity on one pound-mass under standard gravity.
History
Pound-force developed in imperial engineering contexts that separate mass and force units.
Current use
Pound-force is used in mechanical engineering, fasteners, testing equipment, thrust, and force gauges.
kilogram-force [kgf]
Definition
The kilogram-force (kgf) is a force unit used to express measurements in this converter.
History
This unit is included because it appears in practical measurement systems, technical references, product specifications, or everyday conversion needs.
Current use
Use kilogram-force when comparing force values, checking specifications, converting between systems, or preparing quick estimates.