Horse power is the unit of measurement of power. In other words, its the amount of rate of work done. One horse power is equal to 33,000 foot-pounds of work per minute in the British Imperial unit. It is a unit in the foot-pound-second. Watt is the unit of power in the SI Unit. It is equal to 1 joule per second and it is a measure of the rate of change of energy. You can make use of this horsepower (hp) to watts (W) conversion calculator to convert values from horse power to watts and vice versa.