Newton-Meters to Pound-Feet

Newton-meters and pound-feet

A newton-meter is the torque of one newton acting on a one-meter lever arm. Bolt torque specs, car engine torque in metric countries and torque wrenches use N·m.

A pound-foot is one pound-force on a one-foot lever: about 1.3558 N·m. US car engine torque and lug-nut and bolt specs use lb·ft, commonly called foot-pounds.

Worked example

Convert 100 N·m: 100 × 0.7375621493 = 73.75621493, so 100 newton-meters is 73.75621493 pound-feet. Likewise 200 N·m = 147.5124299 lbf·ft.

Estimating in your head

Multiply by 0.74 for a quick figure; it is off by about 0.3%. For 100 N·m that gives 74 lbf·ft, against 73.7562 exactly.

Going the other way

To convert pound-feet to newton-meters, divide by 0.7375621493 (or multiply by 1.35581794833). The swap button between the boxes opens that page.

lbf·ft = N·m × 0.7375621493

1 N·m = 1 N·m and 1 lbf·ft = ≈ 1.355817948 N·m, both by definition, so the factor is their ratio: 0.7375621493 (rounded here; the page uses the full value). Results drop binary floating-point noise beyond 15 significant digits and display at the precision you choose (6 significant figures by default). Copy result copies the full value.