# Newtons to Kilograms-force (N to kgf)

> Convert newtons to kilograms-force: 1 N = 0.101972 kgf. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.

- Page id: `newtons-to-kgf` · Quantity: Force (`force`, base unit N) · Tool: `convert_units`
- Canonical page: https://tttkmbb.com/conversion/newtons-to-kgf · This document: https://tttkmbb.com/conversion/newtons-to-kgf.md · JSON: https://tttkmbb.com/conversion/newtons-to-kgf.json (add `?value=` for a result)

## Formula

- `1 N = 0.101972 kgf`
- `kilograms-force = newtons × 0.1019716213`
- Reverse: `newtons = kilograms-force × 9.80665`

The factor follows from the SI definitions of both units (NIST SP 811); values below are rounded to 6 significant figures, the API returns up to 12.

## Worked examples

- 5 N = 0.509858 kgf
- 12.5 N = 1.27465 kgf
- 100 N = 10.1972 kgf

## Conversion table

| Newtons (N) | Kilograms-force (kgf) |
| --- | --- |
| 1 | 0.101972 |
| 2 | 0.203943 |
| 3 | 0.305915 |
| 4 | 0.407886 |
| 5 | 0.509858 |
| 6 | 0.61183 |
| 7 | 0.713801 |
| 8 | 0.815773 |
| 9 | 0.917745 |
| 10 | 1.01972 |
| 15 | 1.52957 |
| 20 | 2.03943 |
| 25 | 2.54929 |
| 30 | 3.05915 |
| 40 | 4.07886 |
| 50 | 5.09858 |
| 75 | 7.64787 |
| 100 | 10.1972 |
| 200 | 20.3943 |
| 250 | 25.4929 |
| 500 | 50.9858 |
| 1000 | 101.972 |

## API

- `GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=N&to_unit=kgf` → unified JSON envelope with `result.values.result`, `formula`, `factor`, `sources`, `freshness`
- MCP: server `https://tttkmbb.com/mcp`, tool `convert_units` with `{"value":5,"from_unit":"N","to_unit":"kgf"}`
- All force units: https://tttkmbb.com/api/v1/units?quantity=force · full converter: [Force Converter](https://tttkmbb.com/conversion/force.md)
- Authentication: none. Freshness: `static` (fixed conversion factors).

## FAQ

**How many kilograms-force are in one newton?**

1 N = 0.101972 kgf. The factor comes from the SI definitions of both units (NIST SP 811 / BIPM), so it is exact or correct to at least 10 significant figures.

**What is the formula to convert newtons to kilograms-force?**

Multiply the value in newtons by 0.1019716213: kilograms-force = newtons × 0.1019716213. For example, 5 N = 0.509858 kgf.

**How do I convert kilograms-force back to newtons?**

Multiply by the inverse factor 9.80665 (newtons = kilograms-force × 9.80665), or use the kilograms-force-to-newtons page.

## Related conversions

- [Kilograms-force to newtons](https://tttkmbb.com/conversion/kgf-to-newtons.md) (reverse)
- [Newtons to Pounds-force](https://tttkmbb.com/conversion/newtons-to-pound-force.md)
- [Pounds-force to Newtons](https://tttkmbb.com/conversion/pound-force-to-newtons.md)
- [Kilonewtons to Pounds-force](https://tttkmbb.com/conversion/kilonewtons-to-pound-force.md)
- [Pounds-force to Kilonewtons](https://tttkmbb.com/conversion/pound-force-to-kilonewtons.md)
- [Newtons to Dynes](https://tttkmbb.com/conversion/newtons-to-dynes.md)
- [Dynes to Newtons](https://tttkmbb.com/conversion/dynes-to-newtons.md)
- [Kips to Kilonewtons](https://tttkmbb.com/conversion/kips-to-kilonewtons.md)
- [Kilonewtons to Kips](https://tttkmbb.com/conversion/kilonewtons-to-kips.md)

## Data Sources

- NIST Special Publication 811 – Guide for the Use of the International System of Units (SI), Appendix B conversion factors — https://www.nist.gov/pml/special-publication-811 (standard, retrieved 2026-09-24)
- BIPM – The International System of Units (SI Brochure, 9th edition) — https://www.bipm.org/en/publications/si-brochure (standard, retrieved 2026-09-24)
- Wikipedia – Conversion of units — https://en.wikipedia.org/wiki/Conversion_of_units (reference, retrieved 2026-09-24)