Compressor Load, Duty & Cost Calculator Motor Power (kW) Cost (p / kWh) Hours / Day Days / Week Load Profile 70% On-Load 30% Off-Load Total Annual Running Cost £0 This calculator estimates the annual running cost of an electric compressor, assuming off-load power consumption is 25% of the full motor power. Other Calculators Energy Recovery Savings Calculator Water in Air Calculator Flow Converter Altitude Converter Mass Flow Converter Flow Rate Converter Air Compressor Performance Calculator