Units & Numbers Tools
Power Converter
Convert between watts, horsepower, kilowatts, and BTUs per hour.
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What is Power?
A power converter for electrical watts and engineering/automotive units, including both metric and mechanical horsepower.
How it works
Everything normalizes to watts; horsepower variants use their exact definitions (735.5 W metric, 745.7 W mechanical).
- Enter your input. Type or paste your input into the field above — the tool responds instantly.
- Review the result. Output updates live as you type. Everything runs entirely in your browser.
- Copy or download. Use the Copy button to grab the result, or Download to save it as a file.
Examples
Appliance ratings
Convert 1,500 watts to 1.5 kW or about 2 horsepower — handy for generator sizing and electrical work.
Common mistakes
Power vs energy
Watts measure the rate of energy use; watt-hours measure total energy. Convert only like-for-like quantities.
Frequently asked questions
Which units are supported?
Watts, kilowatts, megawatts, horsepower (metric and imperial), and BTU per hour.
How do I estimate a generator?
Add the running watts of connected devices and convert to the generator's rated unit — the converter does the math.