Horsepower Calculator
Horsepower (HP) measures the rate of work an engine can perform. It is calculated from torque and RPM: HP = Torque × RPM / 5252. The constant 5252 comes from unit conversion (one horsepower = 550 ft-lb/sec × 60 sec × 2π).
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Tip: For daily driving, torque matters more than peak HP — torque determines acceleration from a stop. HP matters more at high speeds and sustained power output.
- 1Torque (lb-ft) measures rotational force at the crankshaft
- 2RPM is the engine speed in revolutions per minute
- 3HP = Torque × RPM / 5252
- 4Torque and HP curves cross always at 5,252 RPM
350 lb-ft torque at 5,000 RPM=333 HP350 × 5000 / 5252 = 333 HP
400 HP, 4,500 RPM=467 lb-ft torque400 × 5252 / 4500 = 467 lb-ft
| Unit | Equivalent HP | In Watts |
|---|---|---|
| 1 HP (mechanical) | 1.0 | 745.7 W |
| 1 HP (metric/PS) | 0.9863 | 735.5 W |
| 1 kW | 1.341 | 1,000 W |
| 100 HP | 100 | 74,570 W (74.6 kW) |
| 200 HP | 200 | 149,140 W (149.1 kW) |
| 500 HP | 500 | 372,850 W (372.9 kW) |
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Fun Fact
James Watt invented the horsepower unit in the 1780s to compare his steam engines to horses. He observed that a horse could do 33,000 foot-pounds of work per minute — and set that as 1 HP.
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