Kg Force to Newtons Converter
Convert kilogram-force to newtons instantly. Free force converter for physics.
Formula
N = kgf × 9.80665
Common Conversions
How to Convert Kilogram-Force to Newtons
1 kgf = 9.80665 Newtons. Multiply kgf by 9.81 (or 9.80665 for precision) to get N. So 50 kgf × 9.81 = 490.5 N. Kgf (kilogram-force) is an older non-SI unit; equals the force Earth gravity applies to 1 kg of mass.
Used in some older European mechanical equipment specifications. A spring rated at 5 kgf needs 49 N to compress. A weight of 75 kg = 75 kgf = 736 N (under Earth gravity). Modern SI prefers N exclusively; kgf appears mostly in legacy equipment manuals.
Common Kg-Force to Newtons
| Kg-Force | Newtons |
|---|---|
| 1 kgf | 9.81 N |
| 5 kgf | 49.03 N |
| 10 kgf | 98.07 N |
| 25 kgf | 245.17 N |
| 50 kgf | 490.33 N |
| 100 kgf | 980.67 N |
| 500 kgf | 4,903.32 N |
| 1000 kgf | 9,806.65 N |
Frequently Asked Questions
Why isn't kgf in SI?
Because it depends on a value of gravity (9.80665 m/s²) that varies slightly across Earth's surface. SI prefers fundamental units that don't depend on local conditions. The newton (kg·m/s²) is universally constant; kgf is only valid at standard Earth gravity.
Is 1 kgf same as 9.81 N?
Approximately yes, with the precise definition being 1 kgf = 9.80665 N exactly. The 9.81 approximation is usually fine for everyday engineering. Precision applications (aerospace, very precise force measurements) need the exact value.
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