Horsepower Calculator
HP from torque and RPM — or torque from HP — with kW and PS
Horsepower
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Frequently Asked Questions
How do you calculate horsepower from torque?
Horsepower = torque (lb-ft) × RPM ÷ 5252. For example, an engine making 300 lb-ft at 5,000 RPM produces 300 × 5000 ÷ 5252 ≈ 286 HP. The constant 5252 comes from the definition of one horsepower (33,000 ft-lb per minute).
Why do torque and horsepower cross at 5252 RPM?
Because HP = torque × RPM ÷ 5252, the two values are numerically equal whenever RPM equals 5252. On a dyno chart the horsepower and torque curves always intersect at that point.
What is the difference between torque and horsepower?
Torque is rotational force — how hard the engine twists. Horsepower is the rate of doing work — torque combined with how fast the engine spins. Torque gets you moving; horsepower determines top speed and how quickly work is done.
How do I convert horsepower to kilowatts?
Multiply horsepower by 0.7457 to get kilowatts (1 HP = 0.7457 kW). Metric horsepower (PS or CV) is slightly different: 1 PS = 0.7355 kW, so 100 HP ≈ 101.4 PS.
What is a good amount of horsepower for a car?
Everyday commuter cars typically make 120–200 HP, sporty cars 250–400 HP, and performance/supercars 500+ HP. What matters for feel is the power-to-weight ratio, not horsepower alone.