# Kilograms-force to Newtons (kgf to N)

> Convert kilograms-force to newtons: 1 kgf = 9.80665 N. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.

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

## Formula

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

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 kgf = 49.0332 N
- 12.5 kgf = 122.583 N
- 100 kgf = 980.665 N

## Conversion table

| Kilograms-force (kgf) | Newtons (N) |
| --- | --- |
| 1 | 9.80665 |
| 2 | 19.6133 |
| 3 | 29.42 |
| 4 | 39.2266 |
| 5 | 49.0332 |
| 6 | 58.8399 |
| 7 | 68.6465 |
| 8 | 78.4532 |
| 9 | 88.2599 |
| 10 | 98.0665 |
| 15 | 147.1 |
| 20 | 196.133 |
| 25 | 245.166 |
| 30 | 294.2 |
| 40 | 392.266 |
| 50 | 490.332 |
| 75 | 735.499 |
| 100 | 980.665 |
| 200 | 1961.33 |
| 250 | 2451.66 |
| 500 | 4903.32 |
| 1000 | 9806.65 |

## API

- `GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=kgf&to_unit=N` → 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":"kgf","to_unit":"N"}`
- 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 newtons are in one kilogram-force?**

1 kgf = 9.80665 N. 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 kilograms-force to newtons?**

Multiply the value in kilograms-force by 9.80665: newtons = kilograms-force × 9.80665. For example, 5 kgf = 49.0332 N.

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

Multiply by the inverse factor 0.1019716213 (kilograms-force = newtons × 0.1019716213), or use the newtons-to-kilograms-force page.

## Related conversions

- [Newtons to kilograms-force](https://tttkmbb.com/conversion/newtons-to-kgf.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)