Air Consumption Calculator

CFM per tool from duty cycle and rated consumption.

Inputs

Rated CFM per tool

Duty cycle

Number of tools

Diversity factor

Tab to move between fields

Results

Total air demand (CFM)

Effective CFM per tool5

Recommended compressor CFM18.75

Daily consumption (CF)7,200

SCFM (standard)15

How to Use This Calculator

Enter the rated CFM per tool from the manufacturer specification sheet.
Set the duty cycle percentage (how much of the time each tool is actively running).
Enter the total number of pneumatic tools connected to the system.
Set the diversity factor -- the fraction of tools running simultaneously (typically 0.75 for mixed shops).
Review total air demand CFM and recommended compressor CFM, which includes a 25% safety margin.

How the result changes with Rated CFM per tool

Rated CFM per tool	Total air demand (CFM)
50	75
175	262.5
325	487.5
450	675

What each input means

Rated CFM per tool: Manufacturer-rated air consumption in cubic feet per minute at the tool's operating pressure.
Duty cycle: Percentage of time the tool is actively consuming air (e.g., 50% means running half the time).
Number of tools: Total number of pneumatic tools connected to the system.
Diversity factor: Fraction of tools running simultaneously (0.75 = 75% of tools active at any time). Lower values for large shops.

What each result means

Effective CFM per tool: Actual average air consumption per tool accounting for duty cycle.
Total air demand (CFM): Combined air demand from all tools with diversity factor applied.
Recommended compressor CFM: Compressor output needed including 25% safety margin.
Daily consumption (CF): Total cubic feet of air consumed in an 8-hour shift.
SCFM (standard): Standard cubic feet per minute at 14.7 psia and 68°F.

How this is calculated

Worked example, using the default values

Identify Input Parameters
4 parameters
Rated CFM per tool = 10, Duty cycle = 50, Number of tools = 4, Diversity factor = 0.75 = 4 input(s) provided
Calculate Total air demand
Total air demand = effectiveCfmPerTool * numTools * diversityFactor
15 = 15
Calculate Effective CFM per tool
Effective CFM per tool = ratedCfm * (dutyCyclePct / 100)
5 = 5
Calculate Recommended compressor CFM
Recommended compressor CFM = totalDemandCfm * 1.25
18.75 = 18.75

Engine last updated July 26, 2026. Checked against 1 independently-derived test — how we verify calculators.

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