Free Horsepower Calculator - Engine Power Made Easy
Calculate horsepower from torque, RPM, or other measurements. Convert between HP, kW, and PS for automotive, mechanical, and engineering applications.
Quick Answer
Horsepower = (Torque × RPM) ÷ 5252. One horsepower equals 746 watts or 1.014 metric horsepower (PS).
Key Facts about Horsepower Calculator:
- HP = (Torque × RPM) / 5252
- 1 HP = 746 watts = 1.014 PS
- Originally based on horse work rate
- Peak HP occurs at specific RPM
- Torque × RPM / 5252 = HP (lb-ft × RPM)
Why Use Our Horsepower Calculator?
Complete power calculations:
HP from Torque
Calculate from torque and RPM.
Unit Conversion
HP, kW, PS, watts.
Power Curves
Understand power delivery.
Engine Analysis
Compare engines.
Instant Results
Get HP immediately.
100% Private
Your data stays private.
How to Horsepower Calculator in 3 Easy Steps
Calculate horsepower:
Enter Torque
In lb-ft or Nm.
Enter RPM
Engine speed.
Get HP
See horsepower result.
Understand Engine Power
Calculate from torque
Convert between units
Compare engines
Automotive analysis
Common Use Cases for Horsepower Calculator
Perfect for:
Frequently Asked Questions
Everything you need to know about our horsepower calculator
How do I calculate horsepower from torque?
HP = (Torque × RPM) / 5252
HP = (Torque × RPM) / 5252. For example, an engine producing 300 lb-ft at 4000 RPM has: (300 × 4000) / 5252 = 228 HP.
What is the difference between HP, kW, and PS?
1 HP = 0.746 kW = 1.014 PS
1 HP (mechanical) = 0.7457 kW = 1.0139 PS. PS (metric horsepower) is slightly smaller. Most of the world uses kW, US uses HP, Germany uses PS.
What is a good horsepower for a car?
Economy: 100-150 HP. Sports: 300-500 HP. Super: 500+ HP
Economy cars: 100-150 HP. Family sedans: 150-250 HP. Sports cars: 300-500 HP. Supercars: 500-1000+ HP. More HP means faster acceleration but lower fuel efficiency.
Still have questions? Try the tool yourself!
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