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Plant Engineering Calculator

Updated Sep 18, 2026

Compressed Air Cost per CFM Calculator — kWh, Annual Cost & Unit Air Cost

Convert compressor specific power, airflow, operating hours and electricity tariff into annual energy, annual spend and cost per CFM-hour.

Live calculationWorking shownPrivate in browser

Inputs

Results

Package power 90.00 kW
Annual energy 540000 kWh
Annual cost $54000
Cost per CFM-year $108.00
Cost per 1,000 CFM-h $18.00
More actions

Shared links reopen these inputs. Recent and saved calculations stay in this browser unless you clear site data.

Formula

kW=CFM×(kW/100CFM)/100; cost=kW×hours×tariff.

Your calculation, step by step

These steps use the values currently entered above so the result can be checked independently.

  1. 1.Package input = 500.00 CFM × 18.000 kW/100 CFM ÷ 100 = 90.000 kW.
  2. 2.Annual energy = 90.000 × 6000 = 540000.0 kWh/year.
  3. 3.Annual electricity cost = 540000.0 × $0.1000/kWh = $54000.00/year.
  4. 4.Cost per delivered CFM-year = $54000.00 ÷ 500.00 = $108.000.
  5. 5.At this operating point, 1,000 CFM for one hour costs 180.000 kWh × $0.1000 = $18.000.

How to use this calculator

  1. Enter measured or design values using the units shown beside each field.
  2. Review the live results and the substituted calculation steps before using the estimate.
  3. Check the assumptions below, then continue to a related calculator when the next engineering decision needs another model.

Worked example

At 18 kW/100 CFM, 500 CFM requires 90 kW at the stated operating point before hours and tariff are applied.

Assumptions and limits

  • Use total package input specific power at actual operating pressure.
  • Part-load controls can make average specific power worse than full-load data.

How to interpret the result

Treat the primary result as an engineering screening value, then use the secondary outputs to understand scale, energy or operating impact. Confirm site measurements, equipment limits and applicable standards before making a design or control change.

Questions engineers ask

Which compressor power value should I use for cost per CFM?

Use total package input specific power at the actual operating pressure and condition when possible, not only motor nameplate power. Ancillaries and part-load controls can materially change the wire-side kW per 100 CFM.

Why can part-load compressed air cost be worse than the full-load estimate?

Unload, modulation, blow-off and poor sequencing can consume substantial power while delivering less useful air. A single full-load specific-power value can therefore understate annual cost for a variable demand profile.

What does cost per 1,000 CFM-hour mean?

It normalizes the entered operating-point electricity cost to 1,000 CFM delivered for one hour. It is useful for comparing scenarios, but leakage, pressure reduction and control changes should be modeled with the actual demand profile.

Continue the calculation

Use the next calculator in the same engineering workflow instead of restarting from search.

compressor specific powercompressed air system efficiencycompressed air demand profile
Methodology. MAXScanner shows the governing formula, entered values and calculation outputs so the estimate is auditable. The calculator is a screening aid; assumptions and equipment-specific limits remain part of the engineering review.