Horsepower Calculator
Calculate the horsepower of an engine based on torque and RPM.
Published by:
isCalculator Editorial Team
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How to use this tool?
This calculator computes horsepower from torque and RPM using the standard formula: Horsepower = (Torque × RPM) / 5252.
- Enter Torque (in lb-ft) into the first field. Use a positive number, e.g., 350.
- Enter RPM (engine speed) into the second field. Use a positive number, e.g., 5200.
- Click “Calculate Horsepower” or press Enter in either input field.
- The result appears in horsepower (HP), rounded to two decimals, along with the formula and calculation steps.
Note: Inputs must be positive numbers. Torque is in pound-feet (lb-ft); RPM is revolutions per minute. The calculator does not support metric units directly.
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Frequently Asked Questions
The formula is Horsepower = (Torque × RPM) / 5252, where torque is in pound-feet and RPM is revolutions per minute.
Torque is measured in pound-feet (lb-ft) and RPM is revolutions per minute.
Yes, as long as you have the torque and RPM values, you can calculate horsepower for any engine.