A mechanical measurement unit of power which indicates the rate at which work is done and represents the power exerted by a horse when pulling. There are several different types of horsepower and the two most common versions, the first one being mechanical horsepower (or imperial horsepower), which measures to about 745.7 watts and the second one is the metric horsepower, which is approximately 735.5 watts. It is used to denote the maximum power of the engine of a car. You can convert Mechanical Horsepower to other units here by enter amount of if into green input below. You can also check some basic conversions in Mechanical Horsepower Conversion Table.