Power Converter
Convert between watts, kilowatts, horsepower, BTU/hour, and other power units.
Did this tool work for you?
How to use this calculator
- 1
Enter the power value you want to convert.
- 2
Select the unit you are converting from (e.g. horsepower).
- 3
Select the target unit (e.g. kilowatts).
- 4
The result appears instantly.
Frequently asked questions
How do I convert horsepower to kilowatts?
Multiply horsepower (hp) by 0.7457 to get kilowatts (kW). For example, 200 hp = 200 × 0.7457 = 149.14 kW.
How do I convert kW to hp?
Multiply kilowatts by 1.34102 to get horsepower. For example, 100 kW = 134.1 hp.
What is the difference between mechanical horsepower and metric horsepower?
Mechanical (imperial) horsepower (hp) = 745.7 watts. Metric horsepower (PS or CV) = 735.499 watts. They are close but not equal. Car manufacturers in Europe typically use PS.
How many watts is 1 horsepower?
One mechanical horsepower equals 745.7 watts, or approximately 0.746 kW.
What does BTU/hour mean in power terms?
BTU/hour measures heat output rate, commonly used for air conditioners and furnaces. 1 BTU/hour = 0.293 watts. A 12,000 BTU/hr air conditioner outputs about 3,517 watts of cooling.
Power unit conversion guide
Power vs energy
Power is the rate of energy transfer, measured in watts (W) — one watt equals one joule per second. Energy is the total amount transferred over time (watt-hours, kWh). A 60W light bulb consumes 60 joules every second. Run it for an hour and it uses 60 Wh = 0.06 kWh of energy.
Key power conversion factors
1 kW = 1,000 W | 1 MW = 1,000,000 W | 1 hp (mechanical) = 745.7 W | 1 PS (metric hp) = 735.5 W | 1 BTU/hr = 0.293 W.
Where power conversions are used
Car engines (hp vs kW), electric motors (kW ratings), household appliances (watts), generator sizing (kW vs kVA), HVAC systems (BTU/hr vs kW), solar panels (watts peak), and industrial machinery all require power unit conversions.
Learn more from an authoritative source:
NISTNumber Base Converter
Convert numbers between decimal, binary, hexadecimal, and octal instantly.
Force Converter
Convert between newtons, kilonewtons, pound-force, kilogram-force, dynes, and more.
Angle Converter
Convert between degrees, radians, gradians, arcminutes, arcseconds, and revolutions.
Fuel Consumption Converter
Convert between MPG (US), MPG (UK), L/100km, and km/L fuel efficiency units.
Frequency Converter
Convert between hertz, kilohertz, megahertz, gigahertz, and RPM.
Image Resolution Converter
Convert between DPI, PPI, dots per cm, and dots per mm for print and screen.
Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →