CONDUIT CAPACITY CHART

Conduit Trade Size		½"	¾"	1"	1¼"	1½"	2"	2½"	3"	3½"	4"
I.D.Inches		0.622	0.824	1.049	1.38	1.61	2.067	2.731	3.356	3.834	4.334
Internal Area Inches²		0.304	0.533	0.864	1.495	2.035	3.354	5.855	8.841	11.539	14.745
40% Fill Inches²		0.121	0.213	0.346	0.598	0.814	1.342	2.342	3.536	4.616	5.898
Cable O.D.Inch	Cable Area IN²	Numbers listed below are based on 40% fill rate for 3 or more cables
0.100	0.008	15	27	44	76	104	171	298	450	588	751
0.125	0.012	10	17	28	49	66	109	191	288	376	481
0.150	0.018	7	12	20	34	46	76	133	200	261	334
0.175	0.024	5	9	14	25	34	56	97	147	192	245
0.200	0.031	4	7	11	19	26	43	75	113	147	188
0.225	0.040	3	5	9	15	20	34	59	89	116	148
0.250	0.049	2	4	7	12	17	27	48	72	94	120
0.275	0.059	2	4	6	10	14	23	39	60	78	99
0.300	0.071	2	3	5	8	12	19	33	50	65	83
0.325	0.083	1	3	4	7	10	16	28	43	56	71
0.350	0.096	1	2	4	6	8	14	24	37	48	61
0.375	0.110	1	2	3	5	7	12	21	32	42	53
0.400	0.126	1	2	3	5	6	11	19	28	37	47
0.425	0.142	1	2	2	4	6	9	17	25	33	42
0.450	0.159	1	1	2	4	5	8	15	22	29	37
0.475	0.177	1	1	2	3	5	8	13	20	26	33
0.500	0.196	1	1	2	3	4	7	12	18	24	30
0.525	0.216	1	1	2	3	4	6	11	16	21	27
0.550	0.237	1	1	1	3	3	6	10	15	19	25
0.575	0.260	0	1	1	2	3	5	9	14	18	23
0.600	0.283	0	1	1	2	3	5	8	13	16	21
0.625	0.307	0	1	1	2	3	4	8	12	15	19
0.650	0.332	0	1	1	2	2	4	7	11	14	18
0.675	0.358	0	1	1	2	2	4	7	10	13	16
0.700	0.385	0	1	1	2	2	3	6	9	12	15
0.725	0.413	0	1	1	1	2	3	6	9	11	14
0.750	0.442	0	0	1	1	2	3	5	8	10	13
0.775	0.471	0	0	1	1	2	3	5	7	10	13
0.800	0.502	0	0	1	1	2	3	5	7	9	12
0.825	0.534	0	0	1	1	2	3	4	7	9	11
0.850	0.567	0	0	1	1	1	2	4	6	8	10
0.875	0.601	0	0	1	1	1	2	4	6	8	10
0.900	0.636	0	0	1	1	1	2	4	6	7	9
0.925	0.672	0	0	1	1	1	2	3	5	7	9
0.950	0.708	0	0	0	1	1	2	3	5	7	8
0.975	0.746	0	0	0	1	1	2	3	5	6	8
1.000	0.785	0	0	0	1	1	2	3	5	6	8
1.025	0.825	0	0	0	1	1	2	3	4	6	7
1.050	0.865	0	0	0	1	1	2	3	4	5	7
1.075	0.907	0	0	0	1	1	1	3	4	5	7

The reader is cautioned to consult the NEC for specific information regarding conduit fill.
This Conduit Capacity Chart should only be used as a guide when attempting to estimate conduit fill.