Pound-foot to Newton-meter Converter
Converts pound-foot to newton-meter (lb·ft to N·m) and back. The conversion factor is shown below every result.
How to Convert Pound-foot to Newton-meter
What Is a Pound-foot?
Also written ft-lb, the pound-foot (lb·ft) is a US customary torque unit equal to exactly 1.3558179483314003 newton-meters.
What Is a Newton-meter?
Torque's SI unit, the newton-meter (N·m), is the rotational counterpart to force.
Common Pound-foot to Newton-meter Reference Points
Real-world reference values for quick sanity checks.
| Item | Pound-foot (lb·ft) | Newton-meter (approx.) |
|---|---|---|
| A typical car engine's peak torque (approx.) | 150 lb·ft | 203.37 N-m |
| A wheel lug nut torque spec (approx.) | 100 lb·ft | 135.58 N-m |
| Reference values are illustrative approximations for common items, not measured specifications. | ||
Pound-foot to Newton-meter Conversion Table
| Pound-foot (lb·ft) | Newton-meter (N·m) |
|---|---|
| 10 lb·ft | 13.558179 N·m |
| 25 lb·ft | 33.895449 N·m |
| 50 lb·ft | 67.790897 N·m |
| 100 lb·ft | 135.581795 N·m |
| 150 lb·ft | 203.372692 N·m |
| 200 lb·ft | 271.16359 N·m |
| 300 lb·ft | 406.745384 N·m |
| Source: NIST SP 811 (1 lb-ft = 1.3558179483314003 N-m exactly, from lbf x ft) | |
Frequently Asked Questions
How do I convert pound-feet to newton-meters?
Multiply the lb-ft value by 1.3558179483. For example, 25 lb-ft × 1.3558179483 = 33.895 N-m.
Is this the same as foot-pounds?
Yes, pound-foot and foot-pound refer to the same unit when used for torque; the ft-lb notation is common but can be confused with foot-pound as a unit of energy, which is why lb-ft is often preferred for torque specifically.
Why is the factor 1.3558179483?
It comes from multiplying the exact pound-force (4.4482216152605 N) by the exact foot (0.3048 m), giving the newton-meter equivalent of one pound-foot of torque.
Related Torque Converters
A good measuring tool marked in both lb·ft and N·m removes the guesswork at the point of use.