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Horsepower Calculator

Calculate horsepower from torque and RPM.

Last updated: June 13, 2026

Calculator

Torque

lb-ft

RPM

Results

Horsepower286 HP

Kilowatts213.0 kW

Metric HP (PS)290 PS

FormulaHP = Torque × RPM ÷ 5252

How to Use This Calculator

1Enter your engine torque in lb-ft.
2Enter the RPM.
3View horsepower, kilowatts, and metric HP.

Formula Explanation

Horsepower is derived from torque and RPM using James Watt's standard formula.

HP = (Torque × RPM) ÷ 5252

Variables:

TorqueEngine torque in pound-feet

RPMEngine speed in revolutions per minute

5252Constant derived from the definition of one horsepower

Worked Examples

300 lb-ft at 5000 RPM

1. HP = (300 × 5000) ÷ 5252 = 285.6

Result: 286 HP (213.2 kW / 290 PS)

Why Use This Calculator

Essential for understanding engine performance.
Converts between HP, kW, and PS for international comparison.
Based on the industry-standard formula.

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Tips & Best Practices

Torque and HP always cross at 5,252 RPM.
Peak HP usually occurs at higher RPM than peak torque.
Diesel engines typically have high torque but lower HP.

Common Mistakes to Avoid

❌ Confusing wheel HP with crank HP.

✅ Dyno readings at the wheels are 12-20% less than crank HP due to drivetrain losses.

❌ Comparing HP across different RPM ranges.

✅ Always note the RPM — 300 HP at 8000 RPM feels very different from 300 HP at 4000 RPM.

Frequently Asked Questions

What is the difference between HP and torque?

Torque is the twisting force the engine produces. Horsepower is the rate at which that force is applied (torque × speed). Torque gets you moving; horsepower keeps you fast.

How much HP does my car have?

Check your vehicle manual or search your make, model, and year online. Factory HP ratings are measured at the crankshaft (brake HP).

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Disclaimer: This calculator is provided for informational and educational purposes only. Results are estimates and should not be used as a substitute for professional advice. RediCalc.com makes no guarantees regarding the accuracy, completeness, or suitability of any calculations. Always consult a qualified professional before making financial, health, construction, or other important decisions.

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