# Pound-feet (ft-lb) to Kilogram-force meters (lbf·ft to kgf·m)

> Convert pound-feet (ft-lb) to kilogram-force meters: 1 lbf·ft = 0.138255 kgf·m. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.

- Page id: `ft-lbs-to-kgf-m` · Quantity: Torque (`torque`, base unit Nm) · Tool: `convert_units`
- Canonical page: https://tttkmbb.com/conversion/ft-lbs-to-kgf-m · This document: https://tttkmbb.com/conversion/ft-lbs-to-kgf-m.md · JSON: https://tttkmbb.com/conversion/ft-lbs-to-kgf-m.json (add `?value=` for a result)

## Formula

- `1 lbf·ft = 0.138255 kgf·m`
- `kilogram-force meters = pound-feet (ft-lb) × 0.1382549544`
- Reverse: `pound-feet (ft-lb) = kilogram-force meters × 7.233013851`

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 lbf·ft = 0.691275 kgf·m
- 12.5 lbf·ft = 1.72819 kgf·m
- 100 lbf·ft = 13.8255 kgf·m

## Conversion table

| Pound-feet (ft-lb) (lbf·ft) | Kilogram-force meters (kgf·m) |
| --- | --- |
| 1 | 0.138255 |
| 2 | 0.27651 |
| 3 | 0.414765 |
| 4 | 0.55302 |
| 5 | 0.691275 |
| 6 | 0.82953 |
| 7 | 0.967785 |
| 8 | 1.10604 |
| 9 | 1.24429 |
| 10 | 1.38255 |
| 15 | 2.07382 |
| 20 | 2.7651 |
| 25 | 3.45637 |
| 30 | 4.14765 |
| 40 | 5.5302 |
| 50 | 6.91275 |
| 75 | 10.3691 |
| 100 | 13.8255 |
| 200 | 27.651 |
| 250 | 34.5637 |
| 500 | 69.1275 |
| 1000 | 138.255 |

## API

- `GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=lbf_ft&to_unit=kgf_m` → 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":"lbf_ft","to_unit":"kgf_m"}`
- All torque units: https://tttkmbb.com/api/v1/units?quantity=torque · full converter: [Torque Converter](https://tttkmbb.com/conversion/torque.md)
- Authentication: none. Freshness: `static` (fixed conversion factors).

## FAQ

**How many kilogram-force meters are in one pound-foot?**

1 lbf·ft = 0.138255 kgf·m. 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 pound-feet (ft-lb) to kilogram-force meters?**

Multiply the value in pound-feet (ft-lb) by 0.1382549544: kilogram-force meters = pound-feet (ft-lb) × 0.1382549544. For example, 5 lbf·ft = 0.691275 kgf·m.

**How do I convert kilogram-force meters back to pound-feet (ft-lb)?**

Multiply by the inverse factor 7.233013851 (pound-feet (ft-lb) = kilogram-force meters × 7.233013851), or use the kilogram-force meters-to-pound-feet (ft-lb) page.

## Related conversions

- [Kilogram-force meters to pound-feet (ft-lb)](https://tttkmbb.com/conversion/kgf-m-to-ft-lbs.md) (reverse)
- [Newton-meters to Pound-feet (ft-lb)](https://tttkmbb.com/conversion/newton-meters-to-ft-lbs.md)
- [Pound-feet (ft-lb) to Newton-meters](https://tttkmbb.com/conversion/ft-lbs-to-newton-meters.md)
- [Newton-meters to Pound-inches (in-lb)](https://tttkmbb.com/conversion/newton-meters-to-in-lbs.md)
- [Pound-inches (in-lb) to Newton-meters](https://tttkmbb.com/conversion/in-lbs-to-newton-meters.md)
- [Newton-meters to Kilogram-force meters](https://tttkmbb.com/conversion/newton-meters-to-kgf-m.md)
- [Kilogram-force meters to Newton-meters](https://tttkmbb.com/conversion/kgf-m-to-newton-meters.md)
- [Pound-feet (ft-lb) to Pound-inches (in-lb)](https://tttkmbb.com/conversion/ft-lbs-to-in-lbs.md)
- [Pound-inches (in-lb) to Pound-feet (ft-lb)](https://tttkmbb.com/conversion/in-lbs-to-ft-lbs.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)