Cylinder Capacities

This table shows the calculated capacities of popular cylinders, in cubic feet, at various pressures.

• Pressures are expressed in pounds per square inch (psi).
• Tanks are listed in ascending order according to actual internal size (not rated capacity when full). For example an aluminum 80 (actually 78.8 cubic feet) is listed before a steel 72 (71.2), as its capacity at the same pressure is actually less. Also note that the actual capacity of a high-pressure steel 100 is substantially less than that of a low-pressure steel 85.
• Actual capacities vary slightly from manufacturer to manufacturer. Additionally, this chart assumes linear compressibility and does not account for the fact gasses tend to resist compressibility as pressure rises. Nevertheless, these factors are not sufficient to affect the validity of this table in any material fashion.
• Links appearing at the bottom of this page will enable you to download this chart as a Microsoft Excel file.

 

Type	Alum	Alum	HP Steel	LP Steel	Alum	LP Steel	HP Steel	LP Steel	LP Steel	LP Steel	LP Steel
Capacity (cu ft)	71.2	78.8	100	71.2	100	85	120	95	104	112	120
Rated Pressure	3000	3000	3500	2475	3300	2640	3500	2640	2640	2640	2640
psi per cu ft	42	38	35	35	33	31	29	28	25	24	22
100	2	3	3	3	3	3	3	4	4	4	5
200	5	5	6	6	6	6	7	7	8	8	9
300	7	8	9	9	9	10	10	11	12	13	14
400	9	11	11	12	12	13	14	14	16	17	18
500	12	13	14	14	15	16	17	18	20	21	23
600	14	16	17	17	18	19	21	22	24	25	27
700	17	18	20	20	21	23	24	25	28	30	32
800	19	21	23	23	24	26	27	29	32	34	36
900	21	24	26	26	27	29	31	32	35	38	41
1000	24	26	29	29	30	32	34	36	39	42	45
1100	26	29	31	32	33	35	38	40	43	47	50
1200	28	32	34	35	36	39	41	43	47	51	55
1300	31	34	37	37	39	42	45	47	51	55	59
1400	33	37	40	40	42	45	48	50	55	59	64
1500	36	39	43	43	45	48	51	54	59	64	68
1600	38	42	46	46	48	52	55	58	63	68	73
1700	40	45	49	49	52	55	58	61	67	72	77
1800	43	47	51	52	55	58	62	65	71	76	82
1900	45	50	54	55	58	61	65	68	75	81	86
2000	47	53	57	58	61	64	69	72	79	85	91
2100	50	55	60	60	64	68	72	76	83	89	95
2200	52	58	63	63	67	71	75	79	87	93	100
2300	55	60	66	66	70	74	79	83	91	98	105
2400	57	63	69	69	73	77	82	86	95	102	109
2500	59	66	71	72	76	80	86	90	98	106	114
2600	62	68	74	75	79	84	89	94	102	110	118
2700	64	71	77	78	82	87	93	97	106	115	123
2800	66	74	80	81	85	90	96	101	110	119	127
2900	69	76	83	83	88	93	99	104	114	123	132
3000	71	79	86	86	91	97	103	108	118	127	136
3100	74	81	89	89	94	100	106	112	122	132	141
3200	76	84	91	92	97	103	110	115	126	136	145
3300	78	87	94	95	100	106	113	119	130	140	150
3400	81	89	97	98	103	109	117	122	134	144	155
3500	83	92	100	101	106	113	120	126	138	148	159
3600	85	95	103	104	109	116	123	130	142	153	164
3700	88	97	106	106	112	119	127	133	146	157	168
3800	90	100	109	109	115	122	130	137	150	161	173

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