Power Converter
Convert continuous energy expenditure and output rates across mechanical, electrical, and HVAC heating/cooling domains. Effortlessly translate engine horsepower to kilowatts, HVAC BTU/hr ratings, and appliance wattages.
Rate of energy transfer value to convert
Starting unit of power output
Destination target power unit
Output rating in chosen target unit
How to Use This Calculator
- Enter the numerical power rating.
- Select your input unit (e.g., Horsepower, Kilowatts, or BTU/hr).
- Select your destination unit.
- Inspect the converted rating along with SI Watts and mechanical HP.
Formula & Calculation Methodology
Power measures the rate of doing work (dE/dt) in Joules per second (Watts). James Watt defined 1 mechanical horsepower as 33,000 ft⋅lbf/min, which equals approximately 745.69987 Watts. In metric systems, 1 PS (Pferdestärke) is defined as 75 kgf⋅m/s = 735.49875 W.
Worked Example
Automotive engine: 100 horsepower to kilowatts
HVAC Air Conditioner: 12,000 BTU/hr to Kilowatts
Frequently Asked Questions
How many watts are in one horsepower?↓
One imperial mechanical horsepower (hp) equals approximately 745.7 Watts (0.7457 kW). Metric horsepower (PS) equals 735.5 Watts.
What is a Ton of Refrigeration?↓
A ton of refrigeration (TR) is the rate of heat transfer required to freeze or melt 1 short ton (2,000 lbs) of ice at 0°C in 24 hours, equal to 12,000 BTU/hr or approximately 3.517 kW.
What is the relationship between power and energy?↓
Power is the instantaneous rate of energy flow (Joules per second), while energy is the total accumulated power consumed over time (Power × Time = Energy).
What is a limitation when comparing engine brake horsepower (bhp) to wheel horsepower (whp)?↓
Standard power conversion assumes ideal scalar rates; real automotive drivetrain losses (friction in transmission, driveshaft, and differential) reduce wheel horsepower by 12% to 20% compared to engine crankshaft rating.
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Source Citation & Disclaimer
Informational tool only; not licensed tax, legal, or financial advice.