Torque unit converter.

Worked example

A wheel-nut spec says 100 N·m. That is 100 ÷ 1.355818 = 73.756 lbf·ft, or 885.07 lbf·in, or 10.197 kgf·m. Going the other way, 250 lbf·ft × 1.355818 = 338.95 N·m.

How it works

Every value is converted to newton metres first, then to the other units. The factors are 1 lbf·ft = 1.355818 N·m, 1 lbf·in = 0.1129848 N·m and 1 kgf·m = 9.80665 N·m (NIST SP 811). Kilogram-force centimetre is one hundredth of a kgf·m, so 1 kgf·cm = 0.0980665 N·m. Since 1 lbf·ft is 1.355818 N·m, N·m to lbf·ft multiplies by 0.737562.

"lb-ft", "ft-lb" and "lbf·ft" are all used for the same torque unit: pounds of force acting at a distance of one foot. Pounds-force times feet is also how work and energy are written, but a torque in lbf·ft is not an amount of energy.

Sources and basis: NIST Guide to the SI, Appendix B: Conversion Factors. Checked 2026-10-08. Planning and learning aid only. It is not for structural, pressure-system or other safety-critical design, and it is not professional engineering advice. Have a qualified engineer check anything that carries people or could fail dangerously.

FAQ

How do I convert Nm to lb-ft?

Multiply newton metres by 0.737562 (divide by 1.355818). 100 N·m is 73.756 lbf·ft.

How do I convert lb-ft to Nm?

Multiply pound-force feet by 1.355818. 250 lbf·ft is 338.95 N·m.

Is a foot-pound the same as a pound-foot?

For torque, yes: lb-ft, ft-lb and lbf·ft all mean pound-force acting at one foot. This calculator treats them as the same unit.

What is kgf·m?

A non-SI unit: one kilogram-force acting at one metre, equal to 9.80665 N·m. kgf·cm is one hundredth of that.

How many lbf·in are in a lbf·ft?

Twelve. 1 lbf·ft is 12 lbf·in, which matches the factors 1.355818 and 0.1129848 N·m (the ratio is 12).