What this conversion means in practice
Many datasheets and older drawings say “kg” when they mean the force of one kilogram in standard gravity—that is kilogram-force (kgf), not mass stored in kilograms. Converting kgf to newtons puts those numbers on the same SI footing as structural software that expects newtons or kilonewtons.
The factor 9.80665 N per kgf is the conventional standard gravity g₀. It is not your local g: for critical weighing or legal metrology you may need site-specific gravity, but for typical engineering hand calculations this constant matches international practice.
If you truly have mass in kg and want weight-force in newtons on Earth, you also multiply by g—but then you are converting mass × acceleration, not renaming kgf. This page is strictly for the force unit kgf ↔ N.
The key relationship on this page is 1 kg = 9.80665 newtons. Use it for quick sanity checks: if the magnitude looks wrong, confirm you are interpreting “kg” as kilogram-force (not mass) and “lbs” as pound-force where applicable.
How to convert kilogram-force to newton
Multiply the kilogram-force value by 9.80665 to get newton (same factors as the full force converter, normalized through newtons).
Example: 10 kg × 9.80665 = 98.0665 newtons
Quick check: 1 kgf is about 9.81 N; 10 kgf is about 98.1 N. If you see hundreds of newtons from a “few kg” label, confirm whether the source meant kgf or mass.
Kilogram-force
Definition: The kilogram-force is the magnitude of the force exerted on one kilogram of mass in standard gravity (g₀ = 9.80665 m/s²); 1 kgf = 9.80665 N.
History and origin: Common in older metric engineering before SI emphasized distinct mass and force units; still appears on legacy machines and regional standards.
Current use: Pressure gauges, cranes, and specifications that quote “kg” as a load; also the conceptual twin of the kilopond (kp).
Newton
Definition: The newton is the SI unit of force: 1 N = 1 kg·m/s².
History and origin: Named after Isaac Newton, formalized as part of the modern SI system.
Current use: Global engineering, physics, and building codes in SI jurisdictions; the standard bridge unit when mixing metric sources.
Kilogram-force to Newton conversion table
| Kilogram-force (kg) | Newton (newtons) |
|---|---|
| 0.1 kg | 0.980665 newtons |
| 0.5 kg | 4.903325 newtons |
| 1 kg | 9.80665 newtons |
| 2 kg | 19.6133 newtons |
| 5 kg | 49.03325 newtons |
| 10 kg | 98.0665 newtons |
| 25 kg | 245.16625 newtons |
| 50 kg | 490.3325 newtons |
| 100 kg | 980.665 newtons |
Kilogram-force to Newton FAQ
How many newtons are in one kilogram-force?
1 kgf = 9.80665 N using standard gravity g₀. Multiply kgf by 9.80665 to get newtons.
Is “kg to newtons” the same as converting kilograms of mass?
Colloquially people say “kg” for kgf. Strictly, kg is mass; kgf is force. This calculator uses kilogram-force so it matches specs that quote “kg” as a load.
Why not use local gravity?
Unit converters standardize on g₀ so everyone gets the same factor. For high-precision weighing, apply your local g separately.