RPM Calculator
Calculate rotational speed from revolutions and elapsed time.
Enter your values
Use the units shown and enter valid values.
Calculation Result
Results are calculated from your inputs.
How It Works
Calculate rotational speed from revolutions and elapsed time.
Use the result as an engineering calculation aid and verify critical designs against applicable standards and manufacturer specifications.
How to use this calculator
What to enter
Enter or select the following as requested: Revolutions; Elapsed time; Time unit. Follow the units, valid ranges, examples, and options displayed beside each field.
What the result means
The mechanical result estimates torque, rotational speed, or power from the entered values and the relationship used by the tool. Check whether the inputs refer to shaft speed, output speed, rated power, or load torque, and keep units consistent.
When to use it
Use this for preliminary rotating-machinery or mechanical-system calculations. Verify the operating point, gear ratio, losses, and equipment ratings before using the estimate for design or operation.