About the Torque Calculator
Torque from force and lever arm (τ = F·r), solving for any variable, in N·m and lb·ft.
Also known as: torque formula, moment of force, nm calculator, lever arm torque.
How to use this calculator
- Enter solve for.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Torque formula
τ = F × r × sin θ (θ = 90° for maximum torque)
Worked example
Using the values pre-filled in the calculator above:
- Solve for: Torque
- Force = 400 N
- Lever arm = 0.3 m
the calculator returns:
- Torque: 120 N·m
- Force: 400 N
- Lever arm: 0.3 m