# Pound-feet (ft-lb) to Newton-meters (lbf·ft to N·m)

> Convert pound-feet (ft-lb) to newton-meters: 1 lbf·ft = 1.35582 N·m. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.

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

## Formula

- `1 lbf·ft = 1.35582 N·m`
- `newton-meters = pound-feet (ft-lb) × 1.355817948`
- Reverse: `pound-feet (ft-lb) = newton-meters × 0.7375621493`

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 = 6.77909 N·m
- 12.5 lbf·ft = 16.9477 N·m
- 100 lbf·ft = 135.582 N·m

## Conversion table

| Pound-feet (ft-lb) (lbf·ft) | Newton-meters (N·m) |
| --- | --- |
| 1 | 1.35582 |
| 2 | 2.71164 |
| 3 | 4.06745 |
| 4 | 5.42327 |
| 5 | 6.77909 |
| 6 | 8.13491 |
| 7 | 9.49073 |
| 8 | 10.8465 |
| 9 | 12.2024 |
| 10 | 13.5582 |
| 15 | 20.3373 |
| 20 | 27.1164 |
| 25 | 33.8954 |
| 30 | 40.6745 |
| 40 | 54.2327 |
| 50 | 67.7909 |
| 75 | 101.686 |
| 100 | 135.582 |
| 200 | 271.164 |
| 250 | 338.954 |
| 500 | 677.909 |
| 1000 | 1355.82 |

## API

- `GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=lbf_ft&to_unit=Nm` → 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":"Nm"}`
- 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 newton-meters are in one pound-foot?**

1 lbf·ft = 1.35582 N·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 newton-meters?**

Multiply the value in pound-feet (ft-lb) by 1.355817948: newton-meters = pound-feet (ft-lb) × 1.355817948. For example, 5 lbf·ft = 6.77909 N·m.

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

Multiply by the inverse factor 0.7375621493 (pound-feet (ft-lb) = newton-meters × 0.7375621493), or use the newton-meters-to-pound-feet (ft-lb) page.

## Related conversions

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