Torque Calculator
Turning force, in newton-metres and pound-feet.
Work out Torque. Turning force, in newton-metres and pound-feet. Free, with no account and nothing to download.
Torque (N·m)
30
22.127 lb·ft
τ = rF sin θ, maximal when the force is perpendicular to the arm. The lever arm matters as much as the force: halving it to 0.15 m halves the torque to 15 N·m. Pulling along the arm rather than across it achieves nothing at all, since sin 0° is zero — which is why a spanner is turned, not tugged.
How the Torque Calculator works
τ = rF sin θ, maximal when the force is perpendicular to the arm. The lever arm matters as much as the force — halving it halves the torque — and pulling along the arm rather than across it achieves nothing at all, which is why a spanner is turned rather than tugged.
Also known as: torque formula · newton meters to pound feet · torque wrench calculator · how to calculate torque
Frequently asked questions
How do I calculate torque?
Multiply the force by the lever arm length, times the sine of the angle between them. 100 N on a 0.3 m arm, applied perpendicular, gives 30 N·m.
How do I convert newton-metres to pound-feet?
Multiply by 0.7376. So 30 N·m is 22.13 lb·ft.
Why does the lever arm matter so much?
Because torque is proportional to it. Doubling the length of a spanner halves the force needed for the same torque, which is the entire reason breaker bars exist.
Does the angle really matter?
Yes. Only the perpendicular component turns anything, so a force at 30° to the arm delivers half the torque of the same force applied at 90°.
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