Compressor and motor ratings appear in kilowatts (kW) or horsepower (hp). Voltage drops in the electrical supply mean an electric motor should be sized at about 115% of the compressor’s absorbed shaft power. Use these tools to convert between kW and hp and to find the next standard IEC motor size for your compressor.
kW and hp converter
Pick a direction, then enter a motor power.
Motor power (hp)
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Motor sizing (115% rule)
Find the motor rating for a compressor’s absorbed shaft power.
Minimum motor rating
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