⚛️

Torque Unit Converter (N·m, lb·ft, lb·in, kgf·m)

Convert torque between newton meters, pound-feet (ft-lb), pound-inches (in-lb), kilogram-force meters and centimeters, ounce-inches and kN·m — for torque wrenches, bolts and engines.

Value to convert

From unit

To unit

Loading calculator…

How it works

value in target unit = value × (N·m per source unit) ÷ (N·m per target unit) · 1 lbf·ft = 1.3558179 N·m · 1 lbf·in = 0.1129848 N·m · 1 kgf·m = 9.80665 N·m

Torque is force times lever arm, so each unit is a force unit multiplied by a length unit, and all are converted through the newton meter. A pound-force foot is 4.4482 N × 0.3048 m = 1.3558 N·m; a pound-force inch is 1/12 of that. Kilogram-force meters (kgf·m, often written kg·m or mkg) still appear in older Japanese and Latin American service manuals.

Worked example

100 lbf·ft × 1.3558179 = 135.582 N·m. The same torque is 1,200 lbf·in or 13.826 kgf·m.

Sources: NIST SP 811, Appendix B — Conversion factors · BIPM — The International System of Units (SI Brochure)

Frequently asked questions

How do I convert ft-lb to N·m?

Multiply by 1.3558: 80 ft-lb (lbf·ft) × 1.3558 = 108.5 N·m. To go from N·m to ft-lb, multiply by 0.7376.

How many inch-pounds are in a foot-pound?

Exactly 12. 25 ft-lb = 300 in-lb. Small fasteners and bicycle parts are often specified in in-lb or N·m.

What is kgf·m in N·m?

1 kgf·m = 9.80665 N·m, so a manual that says 10 kgf·m means 98.1 N·m (72.3 lbf·ft).

Is ft-lb torque the same as ft-lb of energy?

The units look the same but measure different things. For torque the convention is lbf·ft (pound-feet); for work or energy it is ft·lbf (foot-pounds). The numbers convert the same way.

Related calculators

Torque Calculator

Calculate the torque of a force about a pivot from the force, lever arm length and angle.

Force Unit Converter

Convert force between newtons, kilonewtons, kilogram-force, gram-force, metric ton-force, pound-force, ounce-force, kips and dynes — e.g. N to kgf, kgf to N or newtons to lbf.

Bolt Torque & Preload Calculator

Tightening torque from target preload, or clamp force from a known torque, for metric coarse/fine, UNC and UNF bolts: property class or SAE grade, nut factor K or thread and head friction coefficients, preload scatter, bolt stretch and a torque chart.

Horsepower to Torque Calculator

Convert horsepower to torque (and back) at a given engine RPM.

Power Unit Converter

Convert power between watts, kilowatts, megawatts, mechanical horsepower (hp), metric horsepower (CV/PS), BTU per hour, kcal/h and tons of refrigeration — e.g. hp to kW and kW to hp.

This calculator is for educational purposes. Double-check important results before acting on them.