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How to Calculate Your Air Compressor's CFM?

CFM (Cubic Feet per Minute) is the most important performance metric of an air compressor — it tells you how much air your machine actually delivers, which determines whether it can power your tools reliably. To calculate your compressor's true CFM, you need three numbers: your tank size in gallons, the pressure you're testing at (in PSI), and the time it takes your pump to go from 0 PSI to that pressure. Use the calculator below to get your result instantly.

Airtek Ltd.
CFM Calculator
Pump time — 0 to target PSI
Minutes
Seconds
Decimal: 4.5000 min
CFM output
12.5 CFM

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