Torque calculator
Fill in what you know and leave the unknown box empty — it works out whichever one is missing. Nothing is uploaded; the arithmetic happens in your browser.
The formula
τ = Fr
Where this usually goes wrong
r is the distance from the pivot, measured perpendicular to the force. A longer spanner turns the same bolt with less force.
Worked example
40 N on a 30 cm spanner is 12 N·m.
Those numbers are already in the boxes above — press Work it out to see it, then change them for your own.
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