Foot-Pounds to Newton-Meters (ft-lbs to Nm)
1 lbf·ft = 1.35582 N·m
To convert foot-pounds to newton-meters: newton-meters = foot-pounds × 1.355818
| foot-pounds | newton-meters |
|---|---|
| 1 lbf·ft | 1.356 N·m |
| 10 lbf·ft | 13.56 N·m |
| 20 lbf·ft | 27.12 N·m |
| 25 lbf·ft | 33.9 N·m |
| 50 lbf·ft | 67.79 N·m |
| 80 lbf·ft | 108.5 N·m |
| 100 lbf·ft | 135.6 N·m |
| 150 lbf·ft | 203.4 N·m |
| 200 lbf·ft | 271.2 N·m |
| 250 lbf·ft | 339 N·m |
One foot-pound (pound-force foot) is 1.355818 newton-meters. It follows from the exact NIST SP 811 values 1 lbf = 4.4482216152605 N and 1 ft = 0.3048 m: 4.4482216 × 0.3048 = 1.3558179 N·m.
Formula
newton-meters = foot-pounds × 1.355818
Example: 15 foot-pounds = 20.3373 newton-meters.
Foot-Pounds to Newton-Meters chart
| foot-pounds | newton-meters |
|---|---|
| 1 | 1.35582 |
| 5 | 6.77909 |
| 10 | 13.5582 |
| 15 | 20.3373 |
| 20 | 27.1164 |
| 25 | 33.8954 |
| 30 | 40.6745 |
| 40 | 54.2327 |
| 50 | 67.7909 |
| 60 | 81.3491 |
| 70 | 94.9073 |
| 75 | 101.686 |
| 80 | 108.465 |
| 90 | 122.024 |
| 100 | 135.582 |
| 120 | 162.698 |
| 150 | 203.373 |
| 200 | 271.164 |
| 250 | 338.954 |
| 300 | 406.745 |
| 400 | 542.327 |
| 500 | 677.909 |
Good to know
Quick estimate: add a third. 90 ft-lbs + 30 = 120 Nm (exact: 122.02). It is a fast check that a number has been converted in the right direction — the Nm figure is always the larger one.
When to use this: a US manual or click wrench reads ft-lbs but a metric wrench, digital torque adapter or parts sheet uses N·m. Set the wrench to the converted value rounded to the wrench's own increment, and stay within the wrench's rated range, where it is most accurate.
Inch-pounds first? Divide by 12 to get foot-pounds (12 in-lbs = 1 ft-lb exactly), then multiply by 1.355818. Or go straight from in-lbs to N·m with ×0.1129848. Our torque converter does every unit at once.
Frequently asked questions
How do you convert ft-lbs to Nm?
Multiply foot-pounds by 1.355818. For example, 80 ft-lbs × 1.355818 = 108.47 Nm.
How many Nm is 100 ft-lbs?
100 ft-lbs is 135.58 Nm.
How many Nm is 1 ft-lb?
1 ft-lb is 1.3558 Nm.
How many Nm is 25 ft-lbs?
25 ft-lbs is 33.90 Nm.
Are lb-ft and ft-lbs the same?
For torque, yes — both mean pound-force feet and convert with the same 1.355818 factor.