Altitude Correction Calculator

Correct compressor and tool SCFM demand for site altitude above sea level.

Altitude correction overview

Altitude correction overview is computed deterministically from the parameters encoded in this page's address, so the same inputs always produce the same result and the same OAS-XXXX verification hash.

Corrected SCFM demand

Corrected SCFM demand is computed deterministically from the parameters encoded in this page's address, so the same inputs always produce the same result and the same OAS-XXXX verification hash.

Receiver sizing at altitude

Receiver sizing at altitude is computed deterministically from the parameters encoded in this page's address, so the same inputs always produce the same result and the same OAS-XXXX verification hash.

Engineering summary

Governing parameters and computed results for Altitude Correction Calculator.

Governing parameters and computed results for this calculation
Parameter Value
Supply Psi 90

Frequently asked questions

How do I size a receiver tank for a compressor?
Size the receiver so the compressor pumps up in one to five minutes: V = T·(C−D)·Pa / ΔP, where C is compressor output, D is shop demand, Pa is atmospheric pressure and ΔP is the cut-in to cut-out band.
What duty cycle should a shop compressor run at?
Keep the duty cycle at or below 70% so the compressor has recovery time between cycles. Duty cycle is demand divided by compressor output; a value above 70% means the compressor is undersized for the tool load.
Why does tool SCFM demand rise with supply pressure?
Most air tools consume more air at higher supply pressure because the motor runs faster. A 1 in impact wrench draws about 12 SCFM at 90 PSI but 15.6 SCFM at 125 PSI, so size the compressor for the pressure you actually run.