Crank, wheel and rated horsepower
The formula is exact for the relationship between torque, rotational speed and power. Real published numbers may describe crankshaft, wheel or corrected dyno horsepower, so compare like with like.
Example
At 300 lb-ft and 5,252 RPM, horsepower is 300 x 5,252 / 5,252 = 300 hp. At the same torque and 3,000 RPM, power is lower because the engine is doing fewer rotations per minute.
Common mistakes
Use lb-ft in the 5,252 formula. If your torque is in newton-meters, convert it first or use the calculator's Nm option.
Limitations
This estimate does not include drivetrain loss, dyno correction factors, air density, battery limits, turbo behavior or how long the engine can sustain the output.
Last reviewed: 2026-05-17