PSI to CFM Calculator

Volume (V) in cubic feet:

Change in Pressure (ΔP):

Time (T):

Calculated CFM:

To calculate the CFM output of an air compressor using the tank pump-up time method, use the following formula:

CFM = (V × ∆P) ÷ (T × 14.7)

Where:

CFM: Cubic Feet per Minute (output of the air compressor)
V: Volume of the air receiver (tank) in cubic feet
ΔP: Change in pressure during the pump-up time (ending pressure - starting pressure) in PSI
T: Time it takes for the air compressor to fill the tank from the starting pressure to the ending pressure, in seconds
14.7: Atmospheric pressure in PSI at sea level

Use the form above to input the values, and the calculator will provide the required CFM.

Horsepower (HP)	CFM at 100 PSI	CFM at 120 PSI	CFM at 150 PSI
5	17	14	13
10	34	28	26
15	51	42	39
20	68	56	52
25	85	70	65
30	102	84	78
40	136	112	104
50	170	140	130
60	204	168	156
75	255	210	195
100	340	280	260

https://fluidairedynamics.com/pages/cfm-calculator-for-compressed-air

Favorite

Horsepower (HP)	CFM at 100 PSI	CFM at 120 PSI	CFM at 150 PSI
5	17	14	13
10	34	28	26
15	51	42	39
20	68	56	52
25	85	70	65
30	102	84	78
40	136	112	104
50	170	140	130
60	204	168	156
75	255	210	195
100	340	280	260

Horsepower (HP)	CFM at 100 PSI	CFM at 120 PSI	CFM at 150 PSI
5	17	14	13
10	34	28	26
15	51	42	39
20	68	56	52
25	85	70	65
30	102	84	78
40	136	112	104
50	170	140	130
60	204	168	156
75	255	210	195
100	340	280	260

Horsepower (HP)	CFM at 100 PSI	CFM at 120 PSI	CFM at 150 PSI
5	17	14	13
10	34	28	26
15	51	42	39
20	68	56	52
25	85	70	65
30	102	84	78
40	136	112	104
50	170	140	130
60	204	168	156
75	255	210	195
100	340	280	260