Horsepower Calculator
Convert between horsepower, watts, kilowatts, and metric PS — plus torque/rpm to horsepower.
Kilowatts
223.71
Breakdown
- Horsepower (hp)
- 300
- Watts (W)
- 223,710
- Metric horsepower (PS)
- 304.17
- BTU per hour
- 763,329
- HP from your torque @ rpm
- 285.61
- Torque needed for target HP (lb-ft)
- 315.12
Last updated:
FAQ
How do you calculate horsepower from torque?
HP = torque (lb-ft) × rpm ÷ 5252. That constant is why every engine's torque and horsepower curves cross at exactly 5252 rpm on a dyno chart.
What is the difference between hp, PS, and kW?
1 mechanical hp = 745.7 W. Metric PS (Pferdestärke) = 735.5 W, about 1.4% less. Kilowatts are the official SI unit used on EU spec sheets.
Is higher horsepower always faster?
Not alone. Acceleration depends on power-to-weight ratio, gearing, and where the power sits in the rev range. A 200 hp car weighing 1,000 kg can out-drag a 300 hp car at 2,000 kg.
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