Horsepower Calculator

A precision tool for automotive dynamics and power system engineering.

Performance Input

Torque (lb-ft)

lb-ft

The rotational force of the engine.

RPM

Revolutions per minute at peak power.

Tech Reference

Horsepower measures the rate at which an engine does work. It is mathematically tied to torque and rotational speed (RPM).

HP = (Torque × RPM) / 5252

1 HP (Mech)745.7 W

1 HP (Metric)735.5 W

1 kW1.341 HP

The number 5,252 is a constant derived from the definition of horsepower (33,000 lb-ft/min). Because of this, torque and HP curves always cross at exactly 5,252 RPM on a dyno graph.

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Horsepower Calculator

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