Energy & measured leak cost

Compressed Air Leak Cost Calculator

Calculate the electricity cost of a measured compressed air leak in CFM or m³/min, using pressurized hours and matched compressor energy data.

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INPUT GROUP 01

Matched leak and energy basis

Leak flow unitChoose the unit before entering the flow. Changing this selection changes how the entered number is interpreted; it does not convert that number.Measured leak air flowCFM specifies cubic feet per minute, not actual or standard reference conditions. Match the pressure, temperature and volume reference used for the energy input.Measured compressor electricity per matched m³Divide measured electrical kWh by delivered air m³ over the same period and volume reference. This stays in kWh/m³ when leak flow is entered in CFM. Calculate measured kWh per m³

INPUT GROUP 02

Period and energy price

Hours the leaking system remains pressurizedInclude nonproduction hours if the system remains pressurized and leaking. Enter at most 8,784 hours for a one-year scenario.Electricity energy rate

Check the assumptions before acting on a result.

Read the method and example

YOUR CALCULATION

Measured leak flow converted to annual air volume, associated electricity and energy cost.

Leaked air on entered reference basis (m³)

60,000

Associated electricity scenario (kWh)

6,000

Associated electricity charge

$1,200.00

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Compressed air leak cost calculation formula

Cost = q × 60 × h × e × r

q is leak flow in m³/min, h is hours the leaking system remains pressurized, e is compressor electricity in kWh per matched m³ of air, and r is the electricity energy rate per kWh. The factor 60 converts per-minute flow to per-hour flow. For a CFM input, the calculator first multiplies by 0.028316846592 to obtain m³/min.

Where do I find the compressor energy input?

Divide measured compressor electricity in kWh by delivered air in m³ over the same measurement period and on the same volume reference basis. For example, 500 kWh ÷ 5,000 m³ = 0.1 kWh/m³. The compressed-air unit cost calculator helps work through measured electricity, delivered volume and their associated cost.

If matched average electrical input is 30 kW and delivery is 5 m³/min, the energy intensity is 30 ÷ (5 × 60) = 0.1 kWh/m³. Use consistent measurement boundaries and conditions. A rated performance figure may differ from your system’s average operating value.

Does CFM mean the same thing as SCFM?

CFM is cubic feet per minute; the abbreviation alone does not define pressure, temperature or reference conditions. Standard, normal and actual air volumes may differ. Convert the volume units while preserving the stated reference, and match the leak flow to the energy-per-volume figure. This calculator does not correct pressure or temperature.

Does this calculate leak flow or guaranteed repair savings?

Enter an independently measured or supplied leak flow. This tool extends that flow through pressurized hours to estimate associated electricity cost; it does not estimate flow from a hole diameter or pressure. Include nonproduction hours when the system still supplies the leak. Actual electricity savings after repair depend on compressor controls, loading and operation.

For a separate investment scenario, use simple payback with an independently supported net saving. An associated leak cost is not automatically a verified avoided cost.

How the compressed air leak cost calculator works

Annual leaked volume = leak flow in m³/min × 60 × pressurized hours. Associated electricity = leaked volume × measured kWh/m³. Electricity cost = associated kWh × the entered energy rate. Flow entered in CFM is converted using exactly 1 ft³ = 0.028316846592 m³; this is a volume-unit conversion, not a conversion between actual and standard conditions.

Find specific energy by dividing measured compressor electrical kWh by air volume delivered over the same period. If matched input power and delivery flow are available, kWh/m³ = input kW ÷ (delivery m³/min × 60). A data-sheet specific-power value has different units and must be converted before entry. Keep the leak flow and energy intensity on the same pressure, temperature and actual or standard volume reference.

Count all hours the leaking system stays pressurized, including nonproduction time when applicable. Hours are bounded to 8,784 for a one-year scenario. The final energy charge rounds half-up to cents once; zero flow, hours or energy intensity gives zero associated energy cost. Choose flow units before entering a value: changing the selector reinterprets the number rather than converting it.

An avoided air volume does not necessarily produce the same proportionate electrical saving under every load/unload or control strategy. This is not a compressor dispatch model or repair instruction. Leak flow must be supplied: orifice-size estimation, pressure correction, equipment suitability, demand charges, maintenance and safe pressure-system work are outside the tool.

Worked example

A matched leak flow of 1 m³/min over 1,000 pressurized hours is 60,000 m³. At measured specific energy of 0.1 kWh/m³, the associated electricity is 6,000 kWh. At 0.20 per kWh, the cost is 1,200; 2,000 hours gives 2,400. Alternatively, 10 CFM converts to 0.28316846592 m³/min: at the original hours, intensity and rate, the associated electricity is 1,699.01079552 kWh and the rounded cost is 339.80.

Sources and assumptions

The source material explains the underlying calculation or pricing structure. Entered prices, costs, schedules and scenario choices are your assumptions; this tool does not obtain supplier quotes or predict actual results.

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