How to convert pound-feet to newton metres
One pound-foot equals 1.3558 newton metres, so multiply the number of pound-feet by 1.3558:
N·m = lb·ft × 1.3558
lb·ft = N·m ÷ 1.3558 (1 N·m = 0.737562 lb·ft)
Example: 18 lb·ft → 18 × 1.3558 = 24.4047 N·m.
Going the other way, divide by 1.3558, or multiply by 0.737562; the newton metres to pound-feet converter does it for you.
Everyday values
| Pound-feet | Newton metres | For example |
|---|---|---|
| 18 lb·ft | 24.4047 N·m | a spark plug, roughly |
| 80 lb·ft | 108.465 N·m | a typical car wheel nut, roughly |
| 250 lb·ft | 338.954 N·m | a V8 engine |
| 400 lb·ft | 542.327 N·m | a high-torque engine |
When you need this conversion
American service manuals and torque wrenches often use pound-feet (also written ft-lb or lb-ft). Multiply by 1.356 to get newton metres. Note that "in-lb" (inch-pounds), used for small fasteners, is twelve times smaller than lb-ft.
Pound-foot to newton metre conversion table
| lb·ft | N·m | lb·ft | N·m |
|---|---|---|---|
| 10 lb·ft | 13.5582 N·m | 110 lb·ft | 149.14 N·m |
| 20 lb·ft | 27.1164 N·m | 120 lb·ft | 162.698 N·m |
| 30 lb·ft | 40.6745 N·m | 130 lb·ft | 176.256 N·m |
| 40 lb·ft | 54.2327 N·m | 140 lb·ft | 189.815 N·m |
| 50 lb·ft | 67.7909 N·m | 150 lb·ft | 203.373 N·m |
| 60 lb·ft | 81.3491 N·m | 160 lb·ft | 216.931 N·m |
| 70 lb·ft | 94.9073 N·m | 170 lb·ft | 230.489 N·m |
| 80 lb·ft | 108.465 N·m | 180 lb·ft | 244.047 N·m |
| 90 lb·ft | 122.024 N·m | 190 lb·ft | 257.605 N·m |
| 100 lb·ft | 135.582 N·m | 200 lb·ft | 271.164 N·m |
About the units
- Pound-foot (lb·ft): 1 pound-force acting 1 foot from the axis, about 1.3558 N·m.
- Newton metre (N·m): the torque of 1 newton acting 1 metre from the axis.
Both are units of torque. The conversion factor comes from the exact definitions above, so the calculator is exact; results are only rounded for display (up to six significant digits).
Frequently asked questions
How many newton metres are in one pound-foot?
One pound-foot is 1.3558 newton metres. One newton metre is 0.737562 pound-feet.
How do I convert pound-feet to newton metres?
Multiply the value in pound-feet by 1.3558. To go back, divide by 1.3558.
What is 18 lb·ft in newton metres?
18 lb·ft = 24.4047 N·m.
What is 80 lb·ft in newton metres?
80 lb·ft = 108.465 N·m.
Sources
- NIST Special Publication 811 (2008), Guide for the Use of the International System of Units (SI), Appendix B: conversion factors.
- NIST Handbook 44 (2024), Appendix C: General tables of units of measurement.
Last reviewed 5 October 2026. Results are estimates; see our disclaimer.