Use this free horsepower calculator to convert between mechanical horsepower, metric horsepower, watts, and kilowatts.
150 horsepower
Mechanical horsepower, metric horsepower, electric horsepower, and boiler horsepower are different units. This tool reports common mechanical and metric values.
Convert horsepower to watts or kilowatts.
Convert kilowatts into mechanical horsepower.
Compare mechanical horsepower with metric horsepower.
Check power-unit labels on motors, tools, and engines.
111,854.985 W
134.1022 hp
73,549.88 W
Plain-language answers about when to use the tool, what it does with your inputs, what to double-check, and how privacy works.
Use it when your task matches one of these common needs: Convert horsepower to watts or kilowatts. Convert kilowatts into mechanical horsepower. It works best when you already know the values, dates, units, or settings the page asks for.
In plain language: The calculator converts the starting unit to watts, then divides by 745.6999 for mechanical horsepower or 735.4988 for metric horsepower. The examples on the page are there so you can compare your inputs with a filled-out calculation before copying the answer.
Horsepower units are not all the same. Confirm whether your label means mechanical, metric, electric, boiler, or another horsepower standard. Also check that you used the right unit, date, scale, or mode because small input changes can change the result.
No. The calculator runs in your browser tab. Your recent answers stay only on the page while you use it, and they are not sent to a server.