Pound-Force Feet to Newton Meters

1 lbf·ft = 1.355818 N·m

American service manuals, truck specifications, and older torque wrenches use foot-pounds, while metric torque wrenches and international documentation use newton meters. Converting lbf·ft to N·m helps mechanics work with metric tools and lets engineers report figures in SI units.

From

When you need to convert pound-force feet to newton meters

Setting lug nut torque from a US manual on a metric torque wrench
Reporting engine torque in SI units for technical documents
Comparing pickup truck torque ratings with international models
Converting fastener specs for equipment exported from the United States

How to convert pound-force feet to newton meters

N·m = lbf·ft × 1.355818

Example: 5 lbf·ft = 6.77909 N·m

Common torque specs in foot-pounds

Pound-Force Feet (lbf·ft)	Newton Meters (N·m)
10 lbf·ft	13.55818 N·m
20 lbf·ft	27.11636 N·m
25 lbf·ft	33.89545 N·m
50 lbf·ft	67.7909 N·m
80 lbf·ft	108.4654 N·m
100 lbf·ft	135.5818 N·m
150 lbf·ft	203.3727 N·m
300 lbf·ft	406.7454 N·m
500 lbf·ft	677.909 N·m

Tips for converting pound-force feet to newton meters

Multiply lbf·ft by about 1.36 to get N·m. Adding one third gives a quick estimate within about 2%.
Foot-pounds of torque (lbf·ft) and foot-pounds of energy share a name but measure different things; this conversion is for torque.
Check that a spec is not in inch-pounds; inch-pound values are 12 times larger than the equivalent foot-pound value.

Pound-Force Feet to Newton Meters conversion table

Pound-Force Feet (lbf·ft)	Newton Meters (N·m)
1 lbf·ft	1.355818 N·m
2 lbf·ft	2.711636 N·m
3 lbf·ft	4.067454 N·m
4 lbf·ft	5.423272 N·m
5 lbf·ft	6.77909 N·m
6 lbf·ft	8.134908 N·m
7 lbf·ft	9.490726 N·m
8 lbf·ft	10.84654 N·m
9 lbf·ft	12.20236 N·m
10 lbf·ft	13.55818 N·m
15 lbf·ft	20.33727 N·m
20 lbf·ft	27.11636 N·m
25 lbf·ft	33.89545 N·m
30 lbf·ft	40.67454 N·m
40 lbf·ft	54.23272 N·m
50 lbf·ft	67.7909 N·m
75 lbf·ft	101.6863 N·m
100 lbf·ft	135.5818 N·m
250 lbf·ft	338.9545 N·m
500 lbf·ft	677.909 N·m
1,000 lbf·ft	1,355.818 N·m

About the units

Pound-Force Feet: The pound-foot (lb·ft) is a US customary unit of torque, used for engine output and lug nut specifications.

Newton Meters: The newton meter is the SI unit of torque, used for engine torque and bolt tightening specifications.

Frequently asked questions

How many newton meters are in 1 pound-force foot?

1 pound-force foot equals 1.355818 newton meters.

How many pound-force feet are in 1 newton meter?

1 newton meter equals 0.7375621 pound-force feet.

How do I convert pound-force feet to newton meters?

Use the formula N·m = lbf·ft × 1.355818.

What is 10 pound-force feet in newton meters?

10 pound-force feet equals 13.55818 newton meters.

Related conversions

Factors: NIST SP 811 · SI Brochure · NIST Handbook 44 — Updated October 17, 2026