What this calculator does
Torque & rotational power works out turning force, and the power it delivers at a given speed. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
Formulaτ = F·r·sinθ; P = τ·ω = τ·2πN/60 with N in rpm
The inputs explained
| Field | What to enter |
|---|---|
| Force (N) | A number, measured in N. Starts at 200. |
| Lever arm (m) | A number, measured in m. Starts at 0.4. |
| Angle (°) | A number, measured in °. Starts at 90. |
| Rotational speed (rpm) | A number, measured in rpm. Starts at 3000. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with force
Every other input is held at the calculator’s starting values while force varies. Select any row to load that scenario into the calculator.