# Pound-feet (ft-lb) to Pound-inches (in-lb) (lbf·ft to lbf·in)

> Convert pound-feet (ft-lb) to pound-inches (in-lb): 1 lbf·ft = 12 lbf·in. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.

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

## Formula

- `1 lbf·ft = 12 lbf·in`
- `pound-inches (in-lb) = pound-feet (ft-lb) × 12`
- Reverse: `pound-feet (ft-lb) = pound-inches (in-lb) × 0.08333333333`

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 = 60 lbf·in
- 12.5 lbf·ft = 150 lbf·in
- 100 lbf·ft = 1200 lbf·in

## Conversion table

| Pound-feet (ft-lb) (lbf·ft) | Pound-inches (in-lb) (lbf·in) |
| --- | --- |
| 1 | 12 |
| 2 | 24 |
| 3 | 36 |
| 4 | 48 |
| 5 | 60 |
| 6 | 72 |
| 7 | 84 |
| 8 | 96 |
| 9 | 108 |
| 10 | 120 |
| 15 | 180 |
| 20 | 240 |
| 25 | 300 |
| 30 | 360 |
| 40 | 480 |
| 50 | 600 |
| 75 | 900 |
| 100 | 1200 |
| 200 | 2400 |
| 250 | 3000 |
| 500 | 6000 |
| 1000 | 12000 |

## API

- `GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=lbf_ft&to_unit=lbf_in` → 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":"lbf_in"}`
- 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 pound-inches (in-lb) are in one pound-foot?**

1 lbf·ft = 12 lbf·in. 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 pound-inches (in-lb)?**

Multiply the value in pound-feet (ft-lb) by 12: pound-inches (in-lb) = pound-feet (ft-lb) × 12. For example, 5 lbf·ft = 60 lbf·in.

**How do I convert pound-inches (in-lb) back to pound-feet (ft-lb)?**

Multiply by the inverse factor 0.08333333333 (pound-feet (ft-lb) = pound-inches (in-lb) × 0.08333333333), or use the pound-inches (in-lb)-to-pound-feet (ft-lb) page.

## Related conversions

- [Pound-inches (in-lb) to pound-feet (ft-lb)](https://tttkmbb.com/conversion/in-lbs-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)
- [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)