Compressed Air Leak Cost Calculator
Annual cost of compressed air leaks from audit data.
About this calculator
Compressed air is one of the most expensive utilities in an industrial plant because every leak keeps costing money around the clock, whether production is running or not. This calculator starts from your leak audit — the number of leaks found and their average size in CFM — and multiplies them together for total leak flow. That flow is then pressure-corrected: leaks scale with absolute system pressure, so the calculator applies a ratio of your system's absolute pressure (psig + 14.7) against a 100 psig baseline, meaning a 150 psig system leaks noticeably more air through the same size hole than a 90 psig one. To turn wasted air into wasted money, it converts CFM to compressor horsepower using a standard rule of thumb of 4.5 CFM produced per brake horsepower at 100 psig, then to kilowatts (× 0.746), then multiplies by your operating hours and electricity rate for the annual dollar figure.
A parallel CO₂ estimate uses the EPA's average U.S. grid emissions factor of 0.855 lbs per kWh. Keep in mind the "leak percentage estimate" output is a simple yes/no flag here, not a true share of total system demand — that would require your compressor's actual total output, which isn't collected as an input. The 4.5 CFM/bhp figure is also an industry average; older or poorly maintained compressors can run meaningfully less efficient, which would understate the real savings from fixing leaks.
Inputs
Results
Annual leak cost ($)
$2,984.00
How to Use This Calculator
- Enter the system operating pressure in PSI and number of leak points identified.
- Set the average leak size in equivalent orifice diameter or as a percentage of system output.
- Enter your electricity rate per kWh and compressor efficiency.
- Input hours of operation per year.
- Review annual leak cost to justify an ultrasonic leak detection and repair program.
How the result changes with Number of leaks detected
| Number of leaks detected | Annual leak cost ($) |
|---|---|
| 5 | $1,492.00 |
| 7.5 | $2,387.20 |
| 15 | $4,476.00 |
| 25 | $7,460.00 |
What each input means
- Number of leaks detected
- Total number of leaks found during an ultrasonic leak audit.
- Average leak size (CFM)
- Average air loss per leak in CFM. Small hiss ≈ 0.5–2 CFM, medium ≈ 3–5 CFM, large ≈ 10+ CFM.
- System pressure (psig)
- Operating pressure of the compressed air system. Higher pressure increases leak flow.
- Electricity rate ($/kWh)
- Cost of electricity per kilowatt-hour.
- Operating hours/year
- Hours per year the system is pressurized. 24/7 = 8,760; single shift = 2,000; two shifts = 4,000.
What each result means
- Annual leak cost ($)
- Total yearly electricity cost wasted on generating leaked air.
- Total leak flow (CFM)
- Combined air flow lost through all detected leaks, pressure-corrected.
- Wasted compressor power (kW)
- Electrical power the compressor uses just to supply leaked air.
- Cost per leak per year ($)
- Average annual cost attributed to each individual leak.
- Annual CO₂ waste (lbs)
- Estimated CO₂ emissions from wasted electricity (EPA grid average).
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersNumber of leaks detected = 10, Average leak size (CFM) = 3, System pressure (psig) = 100, Electricity rate ($/kWh) = 0.1 = 5 input(s) provided
- Calculate Annual leak costAnnual leak cost = wastedKw * operatingHoursPerYear * electricRateKwh2984 = $2,984
- Calculate Total leak flowTotal leak flow = totalLeakCfm * pressureFactor30 = 30
- Calculate Wasted compressor powerWasted compressor power = wastedBhp * 0.7464.97 = 4.97
Engine last updated . Checked against 1 independently-derived test — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
Why does system pressure change the annual leak cost so much?
Leak flow through a fixed-size orifice scales with the absolute pressure driving air through it, not just the gauge pressure you set. The calculator applies a ratio of your system's absolute pressure (psig + 14.7) to a 100 psig baseline, so a 150 psig system leaks about 22% more air through an identical hole than a 100 psig system, and that extra flow carries straight through to compressor power and cost.
What does the "Leak Percentage Estimate" output actually tell me?
Despite the name, this isn't a share of total system demand — the code caps it at 100 whenever any leak flow exists at all, so it functions as a simple yes/no flag rather than a real percentage. Calculating a true leak percentage would require your compressor's actual total output, which isn't collected as an input here.
How is wasted air converted into a dollar figure?
The calculator divides your pressure-corrected leak CFM by a standard rule-of-thumb efficiency of 4.5 CFM produced per brake horsepower at 100 psig, converts that horsepower to kilowatts (× 0.746), then multiplies by your operating hours and electricity rate. Because 4.5 CFM/bhp is an industry average, an older or poorly maintained compressor running less efficiently would mean your real savings from fixing leaks are higher than this estimate shows.
Where does the CO₂ emissions figure come from?
It multiplies the same wasted kilowatts and operating hours used for the cost calculation by 0.855 lbs of CO₂ per kWh, the EPA's average U.S. grid emissions factor. Because it uses a national average rather than your local utility's actual generation mix, the real figure could be meaningfully higher or lower depending on how much of your electricity comes from coal versus renewables or nuclear.
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