Guide to Power Unit Converter

Power Unit Converter: Watts, Horsepower, BTU/h, and Everything In Between

Power is measured in dozens of different units across the worlds of electrical engineering, mechanical engineering, HVAC, automotive performance, and even cooking appliance specifications. If you have ever needed to compare a motor rated in horsepower with one rated in kilowatts, or figure out how many BTUs per hour your 1500-watt space heater puts out, you know the frustration. Our free Power Unit Converter solves that problem with a single, clean interface that delivers accurate results in real time.

What Is Power, Exactly?

In physics, power is the rate at which energy is transferred or converted. The SI unit is the watt (W), equal to one joule per second. But depending on your field, you might encounter kilowatts, megawatts, horsepower (mechanical, electrical, metric, or boiler - yes, there are multiple kinds), BTU per hour, calories per second, foot-pounds per minute, or even tonnes of refrigeration. Each unit has its history and its context, and our Power Unit Converter handles them all.

Real-World Scenarios That Demand Power Conversion

Buying a car? European specs list engine output in kilowatts, while American and British listings use horsepower. Converting between them helps you make apples-to-apples comparisons. Sizing an HVAC system? You need to convert between watts, BTU/h, and tonnes of refrigeration to match equipment specifications with building load calculations. Evaluating solar panels? Peak output is in watts, but your electricity bill thinks in kilowatt-hours - understanding the relationship starts with accurate power conversion.

The Horsepower Confusion

One of the biggest sources of confusion in power conversion is that the term horsepower refers to several different units. Mechanical (imperial) horsepower is approximately 745.7 watts. Metric horsepower (PS, CV, pk) is about 735.5 watts. Electrical horsepower is exactly 746 watts. Boiler horsepower is a whopping 9,810 watts. Using the wrong version of horsepower in a conversion can throw your calculations off by a significant margin. Our converter lets you specify exactly which horsepower variant you mean.

Comprehensive Unit Support

This Power Unit Converter supports watts, kilowatts, megawatts, gigawatts, milliwatts, mechanical horsepower, metric horsepower, electrical horsepower, boiler horsepower, BTU per hour, BTU per minute, BTU per second, calories per second, kilocalories per hour, foot-pounds per second, foot-pounds per minute, tonnes of refrigeration, and more. Whatever unit your datasheet, textbook, or product specification uses, you can convert it here.

Built for Professionals and Students Alike

Engineers specifying industrial motors, HVAC technicians calculating heating loads, automotive journalists comparing international car specs, physics students solving thermodynamics problems - all of them benefit from fast, reliable power conversion. The tool runs entirely in your browser, works on any device, and requires no registration. Your inputs are never transmitted to a server, making it safe to use even with proprietary engineering data.

Beyond Conversion: Understanding Power in Context

Power is intimately linked to energy and time. One kilowatt sustained for one hour equals one kilowatt-hour of energy. Understanding this relationship is crucial for everything from sizing battery systems to estimating electricity costs. While our Power Unit Converter focuses on instantaneous power units, the clarity it provides forms the foundation for all those downstream energy calculations. Keep it bookmarked, share it with colleagues, and make power unit confusion a thing of the past.