Pipe Sizing (Compressed Air) Calculator

Pipe diameter from CFM and acceptable pressure drop.

Air flow (CFM free air)

Pipe run length (ft)

Operating pressure (psig)

Max pressure drop (psi)

Fittings equivalent length

Tab to move between fields

Recommended pipe size (NPS)

0.5

Actual pipe ID (inches)0.62

Minimum calculated ID (in)0.55

Actual pressure drop (psi)1.59

Air velocity (ft/s)101.2

Velocity rating3

Equivalent length (ft)300

How to Use This Calculator

Enter the required flow rate in CFM and system operating pressure in PSI.
Set the pipe run length in feet and number of fittings (add equivalent lengths for elbows and tees).
Set the allowable pressure drop in PSI for the distribution run.
Review the recommended pipe inside diameter and nearest standard pipe size.
Verify the calculated velocity stays below 20-30 FPS to avoid excessive turbulence.

Ad Placeholder