Typically, a 10 HP two-stage reciprocating compressor delivers about 35–40 CFM at 90 PSI. A 10 HP rotary screw is slightly more efficient, often reaching 38–42 CFM. Single-stage designs usually need 12–15 HP to reach similar output. Always check ratings at your actual working pressure, since CFM drops as PSI increases.
How many workers can a 50 CFM air compressor support?
Three to four workers using moderate-demand tools with typical work patterns. If everyone uses impact wrenches and blow guns intermittently (automotive repair), four technicians work comfortably.
For sustained high-CFM tool use (grinding, sanding, painting), two workers maximum before cycling becomes excessive. Calculate worst-case concurrent demand: three 1/2" impacts (18 CFM) plus two blow guns (6 CFM) plus one sander (10 CFM) totals 34 CFM—within 50 CFM capacity with buffer.
If your shop regularly maxes out capacity, upgrade to 60-80 CFM or add a secondary compressor. Tank size amplifies CFM—a 120 gallon tank with 50 CFM handles demand spikes better than 60 gallons at same CFM.