Sandblaster compressor CFM calculator
How much air your blasting nozzle uses, so you can tell whether your compressor can keep up. Nozzles wear bigger with use, so it also shows the demand once yours is worn.
Air needed
- Once the nozzle wears
- –
- At 80 psi
- –
Compressors are rated at a stated pressure. Compare these numbers with your compressor's cfm at your blasting pressure, and remember that small tank compressors can't run continuously at full output.
How nozzle air use is estimated
Air flow through an orifice rises with its area (the square of its diameter) and with the absolute pressure behind it. This calculator scales from a widely published reference point: a 1/4 in (#4) nozzle at 100 psi uses about 81 cfm. Published charts differ a little between manufacturers, so treat results as estimates.
Blasting is continuous, so a compressor needs to deliver this much air steadily, not just in short bursts from the tank.
Frequently asked questions
Why does nozzle wear matter for compressor sizing?
A blasting nozzle's orifice gradually enlarges with use, and a worn nozzle uses noticeably more air at the same pressure than a new one — sizing your compressor only for a brand-new nozzle can leave you short on air well before that nozzle is actually worn out.
What happens if my compressor can't keep up with the nozzle's demand?
Blasting pressure drops as the compressor falls behind, which slows down stripping speed and can leave inconsistent results — it's more of an efficiency and quality problem than a safety one, but it can make a job take considerably longer than expected.
Does nozzle size or blasting pressure matter more for air demand?
Both matter, but air consumption scales strongly with pressure as well as nozzle size, so bumping up blasting pressure for better cutting speed can meaningfully increase the CFM your compressor needs to supply, even with the same nozzle.
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