100 N·m to lbf·ft
- Newton-meters (N·m)
- 100 N·m
- Pound-feet
- 73.7562149277 lbf·ft
Checked against: Exact-fraction computation from the legal unit definitions
Newton-meters to pound-feet converter
Convert newton-meters to pound-feet (Nm to ft-lbs) with the exact factor, a conversion chart and worked steps.
By AdminDrafted with AI writing toolsUpdated Checked examples: 3
Pound-feet
lbf·ft
Pound-feet: 73.7562149277 lbf·ft
- Conversion
- 100 N·m = 73.7562149277 lbf·ft
- 1 lbf·ft in newton-meters
- 1.355817948N·m
100 N·m is about 73.7562149277 lbf·ft. In the other direction, 1 lbf·ft ≈ 1.35581795 N·m.
Newton-meters to pound-feet
Nm to ft-lbs chart
| Newton-meters | Pound-feet |
|---|---|
| 5 | 3.6878 |
| 10 | 7.3756 |
| 20 | 14.7512 |
| 25 | 18.4391 |
| 50 | 36.8781 |
| 75 | 55.3172 |
| 100 | 73.7562 |
| 150 | 110.6343 |
| 200 | 147.5124 |
| 300 | 221.2686 |
| 500 | 368.7811 |
How it's calculated S
Conversion factor
Rounded here for display; the calculation uses 50 significant digits.
Multiply
About the newton-meters to pound-feet converter
To convert newton-meters to pound-feet, multiply by 0.7375621493; to convert back, multiply by 1.3558179483. For example, 100 N·m is about 73.756215 lbf·ft. Displayed factors and results may be rounded.
A newton-meter torque value may need conversion for a wrench with a pound-foot scale. Use the manufacturer's specified torque and reference conditions. Torque and energy can share dimensions but describe different quantities; this tool converts a turning moment.
One pound-foot is one pound-force (4.4482216152605 N) acting at one foot (0.3048 m), exactly 1.3558179483314004 N·m.
Both units are defined exactly. Calculations use 50 significant digits and round only for display.
How to convert Nm to ft-lbs
Divide newton-meters by 1.3558179483314004, which is the same as multiplying by about 0.7376. So 100 N·m is 73.76 lb-ft, 25 N·m is 18.44 lb-ft and 300 N·m is 221.27 lb-ft. Use it to set a foot-pound torque wrench from a metric spec.
Why you divide by 1.3558179483314004
The exact definition runs the other way: one pound-foot, a pound-force of 4.4482216152605 N on a lever of 0.3048 m, is 1.3558179483314004 N·m (NIST SP 811, Appendix B; pound-force footnote).
One newton-meter is therefore 0.737562… lb-ft, a decimal that never ends. Dividing by the exact factor avoids rounding that multiplier.
Wrench scales and manuals write the same unit as ft-lb, ft-lbs, lb-ft or lbf·ft.
Nm to lb-ft chart
| Newton-meters | Pound-feet, rounded |
|---|---|
| 5 | 3.687811 |
| 10 | 7.375621 |
| 25 | 18.439054 |
| 50 | 36.878107 |
| 100 | 73.756215 |
| 300 | 221.268645 |
Quick estimate
Multiply by 0.74: 100 N·m becomes 74 lb-ft, 0.3% above the exact 73.76. Taking three quarters is easier to do in your head but runs 1.7% high.
Worked examples
- Wheel nuts: a 120 N·m spec is 88.51 lb-ft, so set the wrench to 88.5 lb-ft.
- Engine torque: a car rated at 400 N·m produces 295 lb-ft. To turn torque into horsepower you also need the rpm; the horsepower calculator does that step.
- Small fasteners: 5 N·m is only 3.69 lb-ft. Inch-pounds give finer steps at this size: multiply lb-ft by 12 to get 44.25 lbf·in.
Ranges and angle specs
Convert both ends of a range: 25 to 30 N·m is 18.44 to 22.13 lb-ft.
Some bolts are tightened to a torque and then turned a set angle, such as 40 N·m plus 90°. Only the torque converts, to 29.5 lb-ft; the 90° turn stays the same.
Common mistakes
- Multiplying by 1.3558. That is the pound-foot-to-newton-meter direction and turns 100 N·m into 135.58 lb-ft, 84% too tight. The lb-ft figure is always the smaller number.
- Setting a pound-inch wrench to the lb-ft value. 1 lb-ft is 12 lbf·in, so 44.25 on an inch-pound scale matches 3.69 lb-ft.
- Treating kgf·m as N·m. One kilogram-force meter is 9.80665 N·m, so 10 kgf·m is 98.0665 N·m, or 72.33 lb-ft.
Related torque conversions
The ft-lbs to Nm converter goes the other way, and the torque converter adds lbf·in and kgf·m.
Worked examples
25 N·m to lbf·ft
- Newton-meters (N·m)
- 25 N·m
- Pound-feet
- 18.4390537319 lbf·ft
Checked against: Exact-fraction computation from the legal unit definitions
300 N·m to lbf·ft
- Newton-meters (N·m)
- 300 N·m
- Pound-feet
- 221.268644783 lbf·ft
Checked against: Exact-fraction computation from the legal unit definitions
Questions
How many pound-feet are in one newton-meter?
1 N·m is about 0.7375621493 lbf·ft. One pound-foot is one pound-force (4.4482216152605 N) acting at one foot (0.3048 m), exactly 1.3558179483314004 N·m.
How do I convert newton-meters to pound-feet?
Multiply by 0.7375621493: 100 N·m × 0.7375621493 ≈ 73.756215 lbf·ft. To convert back, divide by the same factor. The factor shown may be rounded.
How can I estimate newton-meters in pound-feet without a calculator?
Multiply by 0.74. This is 0.3% above the exact factor (about 0.7375621493), so 100 N·m comes out as 74 lbf·ft instead of 73.7562 lbf·ft.
About this calculator
Sources
Checked against references
This calculator includes 3 worked examples with independently sourced answers. They run in the test suite, and you can run them here too.