Energy Cost (Compressed Air) Calculator

Electricity typically makes up 70-80% of a compressed air system's lifetime cost, far outweighing the purchase price — this calculator turns your compressor's nameplate specs into an actual annual electric bill. It starts from full-load power draw (horsepower converted to kW and divided by motor efficiency), then adjusts for the fact that a load/unload compressor doesn't sit at full power the whole time: at your specified load factor, it assumes the unloaded portion of the cycle still draws about 25% of full-load power rather than dropping to zero, which is realistic for fixed-speed screw and reciprocating compressors but would overstate savings potential for a VSD unit. Annual kWh comes from multiplying that average power by your operating hours, and annual/monthly cost simply applies your electric rate.

Two benchmarking numbers fall out of the same math: cost per 1,000 cubic feet (dividing annual energy cost by the air actually delivered, itself estimated as rated CFM times load factor) and specific power in kW per 100 CFM — a widely used efficiency yardstick where lower is better, with well-run 100 psig systems typically landing around 18-22. Because delivered air is approximated from load factor alone rather than metered flow, and load/unload cycling behavior is assumed rather than measured from your specific controls, treat the dollar figures as a solid planning estimate for comparing scenarios (different load factors, rates, or hours) rather than a substitute for a metered energy audit.