The unit kilogram-force (kgf or just kg) or kilopond (kp)'s defined as the magnitude of the force exerted on one kilogram of mass by a gravitational field (standard gravity, a conventional value approximating the average magnitude of gravity on Earth). So one kilogram-force's by definition equal to newtons. Similarly a gram-force's millinewtons (or newtons), and a milligram-force's micronewtons (or newtons). The kilogram-force has never been a part of the International System of Units (SI), whic… (More on Kilogram-force)