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Leak Calculator

Leakage rates (CFM) for different supply pressures and approximately equivalent orifice sizes
Pressure (psig) Orifice Size
1/64 1/32 1/16 1/8 1/4 3/8
70 0.29 1.16 4.66 18.62 74.4 167.8
80 0.32 1.26 5.24 20.76 83.1 187.2
90 0.36 1.46 5.72 23.1 92 206.6
100 0.40 1.55 6.31 25.22 100.9 227
125 0.48 1.94 7.66 30.65 122.2 275.5

How to use the Leak Calculator:

  1. Enter the cost of electricity in dollars per kWh.
  2. Enter the number of hours per week the compressor is operated.
  3. Enter the number of weeks a month the compressor is operated.
  4. Enter the CFM loss of your leaks into the table:
    • To get an estimate of your CFM loss, count how many of each type of leak you have. Then, use the table above to get the CFM loss per leak and enter that data into the table.
    • If you've already measured your CFM loss, enter how many leaks you have at any CFM, and click the "Add another row" button if you need more space.

Electricity Cost ($ per kWh)
Hours per week the compressor is operated
Weeks per year the compressor is operated
Leak loss (CFM)Number of leaksAnnual Cost
Total cost: