If your tank is not listed in the table, use the following formula to calculate the tank size (gallons) and then estimate the cubic feet tank capacity at a given pressure from the table above.

Tank Gallons = (Tank Height x (Tank Radius)²) / 73.53

Height and Radius are in inches.

Tank Size (inches)	Tank Size (gallons)	Gauge Pressure on Tank (PSI)
		0	100	150	200
		Cubic Feet Tank Capacity
12 x 24	10	1.3	11	15	19
14 x 36	20	2.7	21	30	39
16 x 36	30	4	31	45	59
20 x 48	60	8	62	90	117
20 x 63	80	10.7	83	120	156
24 x 68	120	16	125	180	234
30 x 84	240	32	250	360	467