Horsepower Calculator
Convert between horsepower units: HP, kW, PS, and metric horsepower.
Horsepower Calculator
Convert between horsepower units: HP, kW, PS, and metric horsepower.
Unit Conversion
ℹ️ All units normalised to a common base before converting to ensure accuracy
Disclaimer
Results provided by this calculator are for informational and educational purposes only. They are based on the values you enter and standard formulas, and should not be considered financial, medical, legal, or professional advice. Always consult a qualified professional before making important decisions based on these results. Roughtools makes no warranties regarding the accuracy or completeness of these calculations for your specific situation.
Frequently Asked Questions
Pro Tips
Always double-check your unit conversion direction — dividing when you should multiply (or vice versa) produces a result off by the conversion factor squared.
For temperature conversions, remember the formulas differ: Celsius to Fahrenheit = (C × 9/5) + 32. Fahrenheit to Celsius = (F − 32) × 5/9. Kelvin = Celsius + 273.15.
Imperial units have multiple definitions (fluid ounce vs weight ounce, US vs UK gallon). Always confirm which system applies — especially for cooking or scientific work.
Significant figures matter in scientific conversions. If your input has 2 significant figures, don't report 6 decimal places of precision — it implies false accuracy.
When to Use This Calculator
Convert between metric and imperial units for temperature, distances, weights, and speeds when travelling abroad.
Convert between US and metric measurements for international recipes or ingredient scaling.
Convert units for scientific calculations where SI units are required.
Convert between measurement systems when working with international suppliers or standards.
Convert units to compare product sizes and prices across different packaging formats.
About the Horsepower Calculator
This horsepower calculator converts between all four power units used in automotive and mechanical engineering — mechanical horsepower (HP), metric horsepower (PS or CV), kilowatts (kW), and BTU/hour — with instant bidirectional results. Select your input unit and value to see the equivalent power in all other units. Built for car buyers comparing engine specs across markets, engineers working with international specs, and mechanics doing power calculations.
How to Use the Horsepower Calculator
- 1
Enter the power value you want to convert.
- 2
Select the input unit: HP (mechanical), PS/CV (metric), kW, or BTU/hr.
- 3
See instant conversions to all other power units.
- 4
Use for comparing car engine specs: European cars list kW and PS; US cars list HP.
- 5
For engine-specific calculations (HP from torque and RPM), use the Engine Horsepower Calculator.
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