Pipes' Relative Capacity

Relative capacity between larger and smaller pipes.

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Pipes relative capacity - the capacity of the larger pipe versus the smaller pipe:

The diagram above and table below are for steel pipes schedule 40.

For full table with larger sizes - rotate the screen!

Relative Capacity (Area Larger Pipe/Area Smaller Pipe)
Larger Pipe		Smaller Pipe
Larger Pipe		Nominal Size (inches)
Nominal Size (inches)	Inside Area (sq. inches)	1/8	¼	3/8	½	¾	1	1 ¼	1 ½	2	2 ½	3	3 ½	4	5	6	8
		Inside Area (sq. Inches)
		0.06	0.1	0.19	0.3	0.53	0.86	1.5	2.04	3.36	4.79	7.39	9.89	12.73	20	28.89	50.02
1/8	0.06	1
¼	0.1	1.67	1
3/8	0.19	3.17	1.9	1
½	0.3	5	3	1.58	1
¾	0.53	8.83	5.3	2.79	1.77	1
1	0.86	14.33	8.6	4.53	2.87	1.62	1
1 ¼	1.5	25	15	7.89	5	2.83	1.74	1
1 ½	2.04	34	20.4	10.74	6.8	3.85	2.37	1.36	1
2	3.36	56	33.6	17.68	11.2	6.34	3.91	2.24	1.65	1
2 ½	4.79	79.83	47.9	25.21	15.97	9.04	5.57	3.19	2.35	1.43	1
3	7.39	123.17	73.9	38.89	24.63	13.94	8.59	4.93	3.62	2.2	1.54	1
3 ½	9.89	164.83	98.9	52.05	32.97	18.66	11.5	6.59	4.85	2.94	2.06	1.34	1
4	12.73	212.17	127.3	67	42.43	24.02	14.8	8.49	6.24	3.79	2.66	1.72	1.29	1
5	20	333.33	200	105.26	66.67	37.74	23.26	13.33	9.8	5.95	4.18	2.71	2.02	1.57	1
6	28.89	481.5	288.9	152.05	96.3	54.51	33.59	19.26	14.16	8.6	6.03	3.91	2.92	2.27	1.44	1
8	50.02	833.67	500.2	263.26	166.73	94.38	58.16	33.35	24.52	14.89	10.44	6.77	5.06	3.93	2.5	1.73	1

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