What this conversion means in practice
Foot-pounds remain the everyday torque language for US automotive and fastener specs, while newton-meters are the SI choice on global drawings and in FEA boundary conditions. Converting keeps torque and work statements consistent when teams mix handbooks.
In strict terms, a foot-pound as an energy unit is the work done by one pound-force through one foot. A newton-meter is the same dimensional idea in SI. The numeric factor is fixed; the hard part is usually knowing whether the spec means torque or energy.
Do not confuse ft·lb with ft·lbf variants from other tools—this page uses the same foot-pound entry as the main energy converter so results stay aligned site-wide.
The key relationship on this page is 1 ft·lb = 1.35581794829 N·m. Use it for quick sanity checks: if the magnitude looks wrong, confirm you are using the same calorie or torque convention as your data source.
How to convert foot-pound to newton meter
Multiply the foot-pound value by 1.35581794829 to get newton meter (same factors as the full energy converter, normalized through joules).
Example: 75 ft·lb × 1.35581794829 = 101.686346121721 N·m
When comparing bolt torque, confirm whether the spec is dry, lubricated, or yield-based; the unit conversion does not replace those mechanical rules.
Foot-pound
Definition: The foot-pound is the work done by one pound-force acting through one foot; in this converter it is treated as an energy unit consistent with the main tool.
History and origin: Persists from imperial mechanical engineering, especially in US automotive and industrial traditions.
Current use: Torque and work specifications in US customary units; conversions to SI are routine in multinational projects.
Newton meter
Definition: The newton-meter is the SI unit of torque; energetically, one newton-meter of work equals one joule when a force moves through distance.
History and origin: Part of the modern SI family tied to the newton and meter redefinitions.
Current use: Global mechanical design, bolt torque specs in SI regions, and educational physics where vectors and units stay coherent.
Foot-pound to Newton meter conversion table
| Foot-pound (ft·lb) | Newton meter (N·m) |
|---|---|
| 1 ft·lb | 1.35581794829 N·m |
| 5 ft·lb | 6.779089741448 N·m |
| 10 ft·lb | 13.558179482896 N·m |
| 25 ft·lb | 33.89544870724 N·m |
| 50 ft·lb | 67.79089741448 N·m |
| 75 ft·lb | 101.686346121721 N·m |
| 100 ft·lb | 135.581794828961 N·m |
| 250 ft·lb | 338.954487072402 N·m |
| 500 ft·lb | 677.908974144804 N·m |
Foot-pound to Newton meter FAQ
How many newton-meters are in one foot-pound?
1 ft·lb ≈ 1.35582 N·m with the factors used here. Multiply ft·lb by that ratio to get N·m.
Is torque in N·m the same as energy in joules?
Numerically, 1 N·m = 1 J when you are measuring work from a force through a distance. Torque is reported as N·m but is not “energy stored” until it moves through an angle in rotational work—context matters.
Why might my torque wrench disagree slightly?
Calibration, temperature, and click vs beam mechanisms dominate small errors. If units match after conversion and the value still looks off, check the wrench spec and fastener grade, not just the factor.