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Newton-Metre, Pound-Foot & Torque Units

Convert signed torque among newton-metres, pound-force feet, kilogram-force metres, poundal feet and other torque units.

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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

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Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

One pound-force foot equals exactly 1.3558179483314004 N·m using standard gravity and the international foot and pound.

Torque in N·m = torque in lbf·ft × 1.3558179483314004

Worked example

Enter these known values and leave the other values blank.

Torque — second unit
1 lbf·ft
Torque — first unit
1.3558 N·m

Assumptions and limitations

  • Force-based units use standard gravity, exactly 9.80665 m/s², and the international foot and pound. US and UK ton-force options mean short and long tons respectively.
  • Signed and zero torque values are allowed. Direction conventions must be consistent across the input and output.
  • Although torque and energy share dimensions, torque in N·m is not interpreted as work in joules here.

Common questions

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

No. One pound-force foot equals twelve pound-force inches; check the unit on the torque specification.

References

Pound-force feet use the exact international pound and foot with standard gravity. Kilogram-force meters use standard gravity exactly, replacing a rounded reciprocal. Metric tonne-force meters use exactly 1000 kilograms and standard gravity. US short-ton-force meters use exactly 2000 international pounds and standard gravity. Imperial long-ton-force meters use exactly 2240 international pounds and standard gravity. Poundal feet use exactly one international pound times the square of the international foot per second squared.

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