What this conversion means in practice
You already have values in Newton (newtons) and need Kilogram-force (kg) for the same material, drawing, or dataset. The factor below is the exact reciprocal of the forward direction; use it when sources quote the “other” unit first.
When a sensor or drawing gives newtons but your site team still thinks in “kilograms of force,” dividing by g₀ converts cleanly from SI force back to kilogram-force. That matches how many legacy scales and hoist ratings were labeled.
Do not treat the output as mass in kilograms unless you are explicitly mapping weight in standard gravity; this page returns kgf as a force unit consistent with the forward page’s definition.
If values look double what you expect, check whether the source already quoted kgf while labeling it “kg.”
The key relationship on this page is 1 newtons = 0.101971621298 kg. 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 newton to kilogram-force
Multiply the newton value by 0.101971621298 to get kilogram-force (same factors as the full force converter, normalized through newtons).
Example: 98.0665 newtons × 0.101971621298 = 10 kg
Sanity: Earth-standard weight of 1 kg mass is about 9.81 N, so 98.1 N ≈ 10 kgf.
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
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 to Kilogram-force conversion table
| Newton (newtons) | Kilogram-force (kg) |
|---|---|
| 9.80665 newtons | 1 kg |
| 49.03325 newtons | 5 kg |
| 98.0665 newtons | 10 kg |
| 196.133 newtons | 20 kg |
| 490.3325 newtons | 50 kg |
| 980.665 newtons | 100 kg |
Newton to Kilogram-force FAQ
Quick answers for Newton-to-Kilogram-force rounding (reverse workflow), precision, and common mistakes.
How many kilogram-force are in one newton?
Divide newtons by 9.80665 to get kgf under standard gravity g₀.
Is this the same as dividing newtons by 9.81 “roughly”?
Yes for quick checks. This converter uses the standard 9.80665 N/kgf constant so results match other pages on the site.
When would I stay in newtons instead?
When combining with other SI quantities (pressure in Pa, stress in N/m²) or when the analysis software expects SI force throughout.