justyourcalculatorHorsepower Calculator
Horsepower from torque and RPM, work done, or a quarter-mile run, plus a power converter.
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Horsepower Calculator
Horsepower from torque, force or quarter-mile runs
Horsepower
285.6 hp
212.97 kW
- Watts
- 212,971.39
- Kilowatts
- 212.971
- Mechanical horsepower (hp)
- 285.599
- Metric horsepower (PS)
- 289.56
- Electrical horsepower
- 285.484
- Boiler horsepower
- 21.711
- BTU per hour
- 726,688.53
- Foot-pounds per second
- 157,079.63
Torque and horsepower curves cross at 5,252 RPM when plotted in lb-ft and hp.
How it was calculated
- hp = torque (lb-ft) × RPM ÷ 5,252 = 300 × 5,000 ÷ 5,252.11 = 285.6
- kW = N·m × RPM × 2π ÷ 60,000 = 212.971
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How the horsepower calculator works
Horsepower is work done per unit of time. One mechanical horsepower is 550 foot-pounds per second, about 745.7 watts. Metric horsepower (PS) is slightly smaller at 735.5 W.
From an engine's torque: hp = torque (lb-ft) × RPM ÷ 5,252. From force and motion: power = force × distance ÷ time.
From a drag strip run, the Hale formulas estimate power: hp = weight ÷ (ET ÷ 5.825)³ or hp = weight × (trap speed ÷ 234)³, with weight in pounds (car plus driver) and speed in mph.
Using and checking your result
Published by JustYourCalculator. Check the units and assumptions above, and compare a known example before relying on the output. Calculations use browser arithmetic and may round displayed values.
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