Horsepower to Watts Converter
Convert Horsepower to Watts instantly with formula, worked example, and conversion table
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About Horsepower to Watts Converter
Horsepower to Watts: Convert Power Units with Confidence
Whether you are upgrading a workshop, specifying an industrial motor, or just trying to understand your car's engine output in metric terms, converting horsepower to watts is a task that comes up surprisingly often. This horsepower to watts converter handles the math instantly, giving you precise results for any value you enter.
How Many Watts in a Horsepower?
One mechanical horsepower equals 745.7 watts. To convert, simply multiply the horsepower value by 745.7. So a 5 HP motor produces 3,728.5 watts, and a 150 HP engine generates 111,855 watts (or about 111.9 kilowatts). The horsepower to watts converter applies this multiplication with full precision, eliminating the guesswork.
James Watt himself defined the unit of horsepower in the 18th century to help sell steam engines by comparing them to draft horses. Ironically, the SI unit of power was later named after him. Today, both units coexist, and the need to convert between them has never been greater.
Electric Vehicle Comparisons
The automotive world is a prime example of why a horsepower to watts converter is indispensable. Traditional gas-powered cars are rated in horsepower, but electric vehicles are spec'd in kilowatts. When a reviewer says a new EV has the equivalent of 400 HP, they have already done the conversion from the manufacturer's 298 kW rating. Now you can verify those numbers yourself.
Understanding the watts behind the horsepower figure also helps when comparing energy costs. Electric motors are rated for efficiency in watts, and your electricity bill is measured in kilowatt-hours. Knowing the watt output of your motor lets you calculate operating costs directly.
Industrial and Commercial Applications
Manufacturing facilities often source equipment from multiple countries. A compressor from the US might be rated at 20 HP, while a comparable unit from Germany lists 15 kW. Converting 20 horsepower to watts gives you 14,914 watts, or about 14.9 kW, showing the two units are nearly equivalent in this case. Without the converter, you might think the German unit is significantly weaker.
Agricultural equipment like tractors, irrigation pumps, and grain augers are commonly rated in horsepower in North America. But when ordering replacement parts or motors from international suppliers, specifications are in watts or kilowatts. The horsepower to watts converter ensures you order the correct replacement.
Different Types of Horsepower
Not all horsepower is created equal. Mechanical horsepower (745.7 W) is the most common in the US. Metric horsepower (PS or CV, equal to 735.499 W) is standard in Europe and Asia. Electrical horsepower (exactly 746 W) is used specifically for electric motor nameplates. Boiler horsepower (9,809.5 W) measures steam boiler output and is an entirely different scale.
This horsepower to watts converter supports all major variants, so you can select the type of horsepower relevant to your situation and get the correct watts equivalent without any ambiguity.
Quick, Free, and Always Ready
Enter your horsepower value and see the watts result immediately. The converter processes everything in your browser, requires no downloads or registration, and works on any device. From quick lookups to engineering calculations, this tool has you covered. Bookmark it for instant access whenever power unit questions arise.