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Kilogram-force to newton: exact 9.80665 factor, scale and hoist examples, conversion chart, and practical tips
Conversion formula
Verification: factors follow standard unit definitions; round for display only.
Quick reference chart
| Kilogram-force | Newton |
|---|---|
| 1 | 9.80665 |
| 2 | 19.6133 |
| 3 | 29.41995 |
| 4 | 39.2266 |
| 5 | 49.03325 |
| 6 | 58.8399 |
Educational explanation
Kilogram-force to newton
Convert kgf to N when a floor scale, hoist rating, or Asian equipment manual lists kilogram-force (kgf, kp) but a load-cell readout, FEA result, or SI structural datasheet expects newtons.
The kilogram-force (kgf, sometimes written kp for kilopond) is the force exerted by one kilogram of mass under standard gravity. The newton (N) is the SI unit of force. This catalog uses 1 kgf = 9.80665 N:
N = kgf × 9.80665 · equivalently N = kgf × (standard gravity gn)
The constant 9.80665 m/s² is conventional standard gravity. The calculator applies the full catalog factor from converters.js.
Step-by-step conversion (worked example)
Convert 10 kgf to newtons—ten kilograms on a metric scale:
- Write the formula: N = kgf × 9.80665
- Multiply: 10 × 9.80665 = 98.0665 N
Second worked example (50 kgf load)
- 50 × 9.80665 = 490.3325 N
- Round: 490 N on a structural sketch
Third worked example (1000 kgf — one tonne-force)
- 1000 × 9.80665 = 9,806.65 N
Quick mental estimate (no calculator)
Multiply kgf by 10 for a quick N estimate (~2% high). Example: 5 kgf → about 50 N (exact: 49.03 N). For tighter work, multiply by 9.81.
Kilogram-force to newton conversion chart
| Kilogram-force (kgf) | Newtons (N) | Typical context |
|---|---|---|
| 1 kgf | 9.807 N | Definition anchor (1 kg × gn) |
| 5 kgf | 49.03 N | Small parcel / hand load |
| 10 kgf | 98.07 N | Floor scale increment |
| 50 kgf | 490.3 N | Person-scale reference |
| 100 kgf | 980.7 N | Hoist / rigging band |
| 500 kgf | 4,903 N | Light industrial lift |
| 1,000 kgf | 9,807 N | 1 metric ton-force scale |
Where kgf → N comes up
- Floor scales and rigging: Display in kgf; structural calcs in N.
- Legacy Asian manuals: Spring ratings in kgf/kp; FEA exports in N.
- Material testing: Grip force in kgf; stress = force/area needs N.
Newton to kilogram-force
Convert N to kgf when a load-cell readout or FEA result lists newtons but a floor scale, hoist rating, or equipment manual expects kilogram-force.
kgf = N × 0.10197162129779283 · equivalently kgf = N ÷ 9.80665
Step-by-step conversion (worked example)
Convert 98.0665 N to kgf:
- 98.0665 ÷ 9.80665 = 10 kgf
Quick reference (N → kgf)
| Newtons (N) | Kilogram-force (kgf) | Typical context |
|---|---|---|
| 9.807 N | 1 kgf | Anchor |
| 49.03 N | 5 kgf | Hand load |
| 490.3 N | 50 kgf | Person-scale |
| 9,807 N | 1,000 kgf | Ton-force class |
See also newtons to kilogram-force for extended reverse-direction copy.
kgf vs kg mass, lbf, and related tools
Kilogram-force is a force unit; kilogram (kg) is mass. Do not drop 'force' from the label when converting.
Common mistakes to avoid
- Treating kgf as mass—on Earth they numerically match for static weight, but SI physics separates mass (kg) from force (N).
- Using local g instead of 9.80665—this site uses standard gravity gn for the catalog factor.
- Confusing kgf with lbf—1 lbf ≈ 4.448 N; 1 kgf = 9.807 N.
Related converters
newton to kilogram-force, newton to pound-force, pound-force to newton, newton to kilonewton, and dyne to newton.
Frequently asked questions
What is the formula to convert kilogram-force to newtons?
N = kgf × 9.80665. Example: 10 kgf = 98.0665 N.
What is the formula to convert newtons to kilogram-force?
kgf = N ÷ 9.80665. Example: 98.0665 N = 10 kgf.
How many newtons are in 1 kilogram-force?
Exactly 9.80665 N on this site's catalog (standard gravity gn).
Is 1 kgf the same as 1 kg?
Numerically equal for weight on Earth, but kg is mass and kgf is force. In SI, weight in newtons is mass × g.
What is 50 kgf in newtons?
490.3325 N (≈ 490 N)—person-scale load example.
What is 1000 kgf in newtons?
9,806.65 N—one metric ton-force under standard gravity.
Why does this site use 9.80665?
That is conventional standard gravity (gn) wired into Kilogram-force in converters.js.
How does kgf compare to lbf?
1 kgf = 9.80665 N; 1 lbf = 4.4482216152605 N on this site. kgf is larger per unit count.
Can I use kgf for structural FEA?
Convert to N (or kN) first—most FEA solvers expect SI force units internally.
How do I validate a spreadsheet?
Convert 10 kgf → 98.0665 N → 10 kgf round-trip.
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