Horsepower to kW Calculator
Motors and engines are rated in horsepower in some places and kilowatts in others. Enter horsepower and this shows the same power in kilowatts and in BTU per hour.
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How it works
One mechanical horsepower is about 745.7 watts, so kilowatts are horsepower times 0.7457. A watt is about 3.412 BTU per hour, which gives the BTU figure.
Metric horsepower, sometimes written PS, is a little smaller, about 735.5 watts. Check which rating the data sheet uses before converting.
Worked example
150 hp is 150 hp of power, or 381,665 BTU/h in BTU per hour.
Questions
Which horsepower is this?
This uses mechanical horsepower, the rating most engine and motor sheets use. Metric horsepower is a little smaller.
Are motor ratings the same as this?
Motor plates usually give kilowatts or horsepower directly. Use the number on the plate, and this converts it when you need the other unit.
Is this the power drawn from the wall?
No. It is the output power at the shaft. Input power is higher because of losses, so it is a different number.
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