How do you convert kilo volt ampere to horsepower?

1 horsepower = 745.7 watts. A kilovoltampere must be a kilowatt, so 1 horsepower = 0.7457 kilowatts

Further Answer

A kilovoltampere (kVA) is only equal to a kilowatt (kW) for a purely resistive load (or at unity power factor). So, if you know the power factor of the load, you can determine the true power in watts, and divide it by 745.7 to convert watts to horsepower.