Prior to this, the unit was widely used in much of the world. The kilogram-force has never been a part of the International System of Units (SI), which was introduced in 1960. Instead, the newton was proposed in 1913 and accepted in 1948. Even then, the proposal to define kilogram-force as standard unit of force was explicitly rejected. The gram-force and kilogram-force were never well-defined units until the CGPM adopted a standard acceleration of gravity of 9.80665 m/s 2 for this purpose in 1901, though they had been used in low-precision measurements of force before that time. Kilogram-force is a non-standard unit and is classified in the International System of Units (SI) as a unit that is not accepted for use with SI. Similarly, a gram-force is 9.806 65 mN, and a milligram-force is 9.806 65 μN. Therefore, one kilogram-force is by definition equal to 9.806 65 N.
That is, it is the weight of a kilogram under standard gravity. The kilogram-force is equal to the magnitude of the force exerted on one kilogram of mass in a 9.806 65 m/s 2 gravitational field ( standard gravity, a conventional value approximating the average magnitude of gravity on Earth). It does not comply with the International System of Units (SI) and is deprecated for most uses. The kilogram-force ( kgf or kg F), or kilopond ( kp, from Latin: pondus, lit.'weight'), is a non-standard gravitational metric unit of force. For other uses, see KGF (disambiguation).
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