I think everyone else has covered how to convert horsepower to other types of measurement. I can tell you the why part. It’s a marketing trick. They want people to think it’s a powerful machine so they use horsepower because people connect the idea with powerful cars or heavy equipment. It sounds better because it makes people think about how much power it’s going to put out. If you were to use watts people would instead think of the power being used and associate it with paying the electric bill. Emotional context is a big part of getting people to buy one brand over the other. They may be the exact same machine with a different label, but one machine has 4 horsepower and the other uses 3000 watts. Even though it means basically the same thing and the machines are identical people are going to buy the one that makes them feel better about the purchase.
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