Horsepower Calculator

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Horsepower ↔ Torque ↔ RPMLive

Use the formula HP = (Torque × RPM) / 5,252. Select what to solve for, enter the other two values, and get the result instantly.

Solve For

Horsepower (HP)

Mechanical horsepower (1 hp = 745.7 W)

Torque

Engine Speed (RPM)

Revolutions per minute at peak power

Horsepower Type

Horsepower from Force × Distance / Time

Calculate horsepower using the definition: Power = Force × Distance / Time. HP = (Force × Distance) / (Time × 550). Enter any units — they are auto-converted.

Force

Distance

Time

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Power Unit ConverterLive

Convert between all power units simultaneously — Watts, kW, all horsepower types, BTU/h, and more.

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All Power Units

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Torque Unit ConverterLive

Convert torque between all common units — Newton-meters, foot-pounds, inch-pounds, and kilogram-meters.

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All Torque Units

Horsepower Guide & Reference

Horsepower Formula

HP = (Torque × RPM) / 5,252
Where Torque is in foot-pounds and RPM is revolutions per minute.
The constant 5,252 = (33,000 ft·lbf/min) / (2π)

In Metric: Power (W) = Torque (N·m) × RPM / 9.5488
HP = (Torque N·m × RPM) / 7,121

The 4 Types of Horsepower

Mechanical HP hp(I): 550 ft·lbf/s = 745.70 W — most common, used for vehicle engines
Metric HP hp(M): 75 kgf·m/s = 735.50 W — used in Europe for vehicle ratings
Electrical HP hp(E): 746 W exactly — used for electric motors
Boiler HP hp(S): 34.5 lb water evaporated/hr = 9,809.5 W — for steam boilers

Torque vs Horsepower

Torque = rotational force — what gets you moving from a stop, climbing hills
Horsepower = rate of doing work — determines top speed and sustained performance

Note: Torque and HP are always equal at exactly 5,252 RPM (in mechanical HP & ft-lb)

Power Unit	In Watts	Description
1 Mech. HP hp(I)	745.70 W	Standard vehicle horsepower
1 Metric HP hp(M)	735.50 W	European PS / CV rating
1 Electrical HP hp(E)	746.00 W	Electric motor rating
1 Boiler HP hp(S)	9,809.50 W	Steam boiler capacity
1 kW	1,000 W	= 1.341 Mech. HP
1 BTU/h	0.29307 W	= 0.000393 HP
100 kW	100,000 W	= 134.1 Mech. HP

Common Vehicle Horsepower Reference

Economy Car: 70–120 hp (Toyota Corolla ~170 hp)
Mid-size Sedan: 150–250 hp (Honda Accord ~192 hp)
Sports Car: 300–500 hp (Ford Mustang GT ~450 hp)
Supercar: 500–1000+ hp (Lamborghini Huracán ~630 hp)
Electric (Tesla Model S Plaid): 1,020 hp
F1 Car: ~1,000 hp combined (ICE + ERS)