Horsepower
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Fun fact: torque and horsepower curves always cross at exactly 5,252 RPM on a dyno chart, a direct consequence of this formula.
Free Horsepower Calculator
Calculate horsepower from torque and RPM.
This is the general engineering formula relating rotational power to torque and speed — it applies to any rotating mechanical system, not just car engines, and is the formula behind engine dyno horsepower/torque curves crossing at exactly 5,252 RPM.
Worked Example
Example: 300 lb-ft of torque at 4,000 RPM: HP = (300 × 4000) / 5252 = 228.5 HP.
Formula / Method
Horsepower = (Torque (lb-ft) × RPM) / 5,252
Worked Example
Example: 300 lb-ft of torque at 4,000 RPM: HP = (300 × 4000) / 5252 = 228.5 HP.
Formula / Method
Horsepower = (Torque (lb-ft) × RPM) / 5,252