PowerCalc

Horsepower Calculator

Torque × RPM ÷ 5,252 — the classic dyno formula.

Torque (lb-ft)

Engine RPM

Horsepower

314.2 HP

Kilowatts: 234.3 kW

What you entered

Torque: 300 lb-ftRPM: 5500

1
Horsepower formula
300 lb-ft × 5500 RPM ÷ 5252= 314.17 HP
2
Convert to kilowatts
314.17 × 0.7457= 234.27 kW

Result

Horsepower: 314.2 HP

300 lb-ft of torque at 5,500 RPM produces 314.2 horsepower (234.3 kW).

Horsepower produced by common engines at their torque peak

Each row runs the standard formula HP = torque x RPM / 5,252 on a torque figure and the engine speed it is measured at, then converts the result to kilowatts (HP x 0.7457). The engine labels describe typical spec-sheet combinations, not any one model.

Engine example	Torque (lb-ft)	Engine RPM	Horsepower (HP)	Power (kW)
Sport bike, high-revving	80	11,000	167.6	124.9
Compact 4-cylinder	130	6,000	148.5	110.7
Midsize sedan 2.5L	180	6,000	205.6	153.3
Turbo 2.0L hot hatch	250	5,000	238.0	177.5
V6 crossover	260	6,400	316.8	236.3
Crossover point (HP = torque)	300	5,252	300.0	223.7
Muscle car V8	350	4,000	266.6	198.8
Performance V8	420	6,000	479.8	357.8
Heavy-duty diesel pickup	900	1,800	308.5	230.0

Horsepower depends entirely on the RPM at which the torque is measured, which is why the diesel row makes huge torque but modest power and the sport bike does the opposite. At exactly 5,252 RPM the two figures are always equal. These are crank figures straight from the formula, not wheel horsepower: a drivetrain typically absorbs 10 to 15 percent before the power reaches the ground, so a chassis dyno will read lower.

Why 5,252 is the magic number

HP = Torque × RPM / 5,252. The constant comes from unit conversion: 1 HP = 33,000 ft·lbs/min, and dividing by 2π gives 5,252. At exactly 5,252 RPM, horsepower and torque are always equal — below that RPM torque is higher, above it horsepower is higher.

Torque vs horsepower

Torque is rotational force — it determines acceleration from a stop and towing capacity. Horsepower is torque sustained over time — it determines top speed and high-RPM performance. Diesel trucks have high torque at low RPM; sport bikes have high horsepower at high RPM.

Frequently asked questions

My engine makes 350 lb-ft of torque at 4,000 RPM — what's the horsepower?

About 267 HP (350 x 4,000 / 5,252). Horsepower depends on the RPM at which torque is measured — the same 350 lb-ft at 6,000 RPM would produce 400 HP.

Why do horsepower and torque always cross at 5,252 RPM?

Because of the unit conversion constant: HP = Torque x RPM / 5,252. At exactly 5,252 RPM, the formula simplifies to HP = Torque. Below that RPM, torque is always the larger number; above it, horsepower is.

Is more torque or more horsepower better?

It depends on the application. Torque matters for towing, hauling, and low-speed acceleration (trucks, off-road). Horsepower matters for top speed and sustained high-RPM performance (sports cars, racing). Most daily driving benefits from a balance of both.

How is this related to the 0-60 calculator?

This calculator tells you power output. The 0-60 calculator uses that power figure plus vehicle weight to estimate acceleration time — horsepower is one of the two key inputs to acceleration performance.