Air Compressor Running Cost Calculator
Estimate air-compressor electricity cost from motor output, efficiency, loaded duty, unloaded power, operating schedule, quantity and editable utility rates.
Default project preview
$347.15
Rated electrical input
8.29 kW each
Average input power
6.26 kW
Scheduled runtime
220 h/month
Monthly energy cost
$247.72
Calculator
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Input and output guide
What each value means
The labels and units below are part of this calculator’s visible methodology. Replace every default with measurements or product data from the actual project.
Operating compressors
Enter this project assumption in a unitless value. The current imperial default is 1. Minimum: 1.
Rated motor output
Enter this project assumption in hp. The current imperial default is 10 hp.
Motor efficiency
Enter this project assumption in %. The current imperial default is 90 %. Minimum: 1. Maximum: 100.
Time operating loaded
Enter this project assumption in %. The current imperial default is 65 %. Minimum: 0. Maximum: 100.
Unloaded power as rated-input percentage
Enter this project assumption in %. The current imperial default is 30 %. Minimum: 0. Maximum: 100.
Scheduled operating hours
Enter this project assumption in hours/day. The current imperial default is 10 hours/day. Minimum: 0. Maximum: 24.
Operating days per month
Enter this project assumption in a unitless value. The current imperial default is 22. Minimum: 0. Maximum: 31.
Electricity energy rate
Enter this project assumption in per kWh. The current imperial default is 0.18 per kWh. Minimum: 0.
Monthly demand charge
Enter this project assumption in per kW. The current imperial default is 12 per kW. Minimum: 0.
How to read the outputs
Rated electrical input
90% motor efficiency. Default preview: 8.29 kW each.
Average input power
loaded and unloaded operating mix. Default preview: 6.26 kW.
Scheduled runtime
10 hours × 22 days. Default preview: 220 h/month.
Monthly energy cost
0.18 per kWh. Default preview: $247.72.
Monthly demand cost
8.29 kW modeled peak. Default preview: $99.43.
Estimated annual cost
twelve equal operating months. Default preview: $4,165.78.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Rated electrical input = motor output ÷ efficiency. Average power blends loaded input with the entered unloaded-power percentage. Monthly kWh = average power × scheduled hours × quantity; energy and demand charges are then added.
Reviewed project guidance
How to use this estimate in a real project
Last reviewed: July 30, 2026
Use the Air Compressor Running Cost Calculator to estimate a planning quantity from verified motor power, load factor, runtime and electricity tariff. It supports scope comparison, purchasing and operating-cost planning, but it does not select equipment, approve code compliance or replace project-specific design.
Calculation steps
- 1Measure or obtain each design input from the actual project and keep one consistent unit system.
- 2Enter motor power, load factor, runtime and electricity tariff using product data or approved design information rather than generic nominal values.
- 3Review the unrounded engineering or usage result before applying allowances, duty cycle, efficiency or tariff assumptions.
- 4Apply each adjustment once, then round only the final purchasing, equipment-count or scheduling output.
Worked numerical example
A 3.7 kW compressor loaded 65% of an 8-hour shift uses about 19.2 kWh; at $0.18/kWh that is about $3.46 per shift.
Purchasing and rounding
Base operating-cost comparisons on motor input or measured kW, loaded/unloaded duty and the applicable tariff; compressor displacement or receiver size is not an energy-use input.
Interpret the result
The estimate converts electrical demand and operating pattern into energy cost. Leaks, unload power, pressure setting and variable-speed control can make actual consumption differ from the assumed load factor.
Page-specific assumptions
- Inputs describe the actual connected system or measured project scope.
- One operating condition, product rating and unit system are used per calculation.
- Allowances and efficiency losses are not already embedded in the entered values.
- Code, health, structural, electrical and hydraulic requirements are verified independently.
Common mistakes
- Using nominal equipment ratings instead of delivered performance at design conditions.
- Mixing instantaneous flow or power with daily or annual energy.
- Applying the same allowance more than once.
- Treating a quantity or cost estimate as equipment selection or professional approval.
Primary and technical references
BuildMeter provides planning estimates, not engineering, architectural, electrical, mechanical, plumbing, permit or code approval. Review the methodology and verify final decisions with product documentation and qualified professionals.
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FAQ
Air Compressor Running Cost Calculator questions
Why include unloaded power?+
Many compressors continue drawing substantial power while unloaded. Enter a measured or manufacturer-specific percentage for a better estimate.
Does motor horsepower equal electrical input?+
No. Horsepower is converted to mechanical output and divided by motor efficiency to estimate electrical input.
Can air leaks be calculated here?+
No. Leaks affect loaded duty and runtime. A leak survey or measured compressor profile provides better inputs for the loaded-time field.