Conduit Fill Chart: EMT, PVC, Rigid (THHN, XHHW, THW)

By Blissom · Updated 2026-10-23

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Use the table for your conduit type and wire insulation. Every conductor in the raceway counts, including the equipment ground. For mixed sizes, use the conduit fill calculator. These charts show conduit fill capacity only, not allowable circuit ampacity: with more than three current-carrying conductors in a raceway, NEC 310.15(C)(1) generally requires ampacity adjustment, and equipment grounding conductors count for fill but not as current-carrying.

EMT fill chart, THHN

EMT with THHN conductors, maximum per trade size
Wire	1/2"	3/4"	1"	1-1/4"	1-1/2"	2"	2-1/2"	3"	3-1/2"	4"
#14	12	22	35	61	84	138	241	364	476	608
#12	9	16	26	45	61	101	176	266	347	443
#10	5	10	16	28	38	63	111	167	219	279
#8	3	6	9	16	22	36	64	96	126	161
#6	2	4	7	12	16	26	46	69	91	116
#4	1	2	4	7	10	16	28	43	56	71
#3	1	1	3	6	8	13	24	36	47	60
#2	1	1	3	5	7	11	20	30	40	51
#1	1	1	1	4	5	8	15	22	29	37
#1/0	1	1	1	3	4	7	12	19	25	32
#2/0	—	1	1	2	3	6	10	16	20	26
#3/0	—	1	1	1	3	5	8	13	17	22
#4/0	—	1	1	1	2	4	7	11	14	18

PVC Sch 40 fill chart, THHN

PVC Sch 40 with THHN conductors, maximum per trade size
Wire	1/2"	3/4"	1"	1-1/4"	1-1/2"	2"	2-1/2"	3"	3-1/2"	4"
#14	11	21	34	60	82	135	193	299	401	517
#12	8	15	25	43	59	99	141	218	293	377
#10	5	9	15	27	37	62	89	137	184	238
#8	3	5	9	16	21	36	51	79	106	137
#6	1	4	6	11	15	26	37	57	77	99
#4	1	2	4	7	9	16	22	35	47	61
#3	1	1	3	6	8	13	19	30	40	51
#2	1	1	3	5	7	11	16	25	33	43
#1	1	1	1	3	5	8	12	18	25	32
#1/0	1	1	1	3	4	7	10	15	21	27
#2/0	—	1	1	2	3	6	8	13	17	22
#3/0	—	1	1	1	3	5	7	11	14	18
#4/0	—	1	1	1	2	4	6	9	12	15

PVC Sch 80 fill chart, THHN

PVC Sch 80 with THHN conductors, maximum per trade size
Wire	1/2"	3/4"	1"	1-1/4"	1-1/2"	2"	2-1/2"	3"	3-1/2"	4"
#14	9	17	28	51	70	118	170	265	358	464
#12	6	12	20	37	51	86	124	193	261	338
#10	4	7	13	23	32	54	78	122	164	213
#8	2	4	7	13	18	31	45	70	95	123
#6	1	3	5	9	13	22	32	51	68	89
#4	1	1	3	6	8	14	20	31	42	54
#3	1	1	3	5	7	12	17	26	35	46
#2	1	1	2	4	6	10	14	22	30	39
#1	—	1	1	3	4	7	10	16	22	29
#1/0	—	1	1	2	3	6	9	14	18	24
#2/0	—	1	1	1	3	5	7	11	15	20
#3/0	—	1	1	1	2	4	6	9	13	17
#4/0	—	—	1	1	1	3	5	8	10	14

Rigid (RMC) fill chart, THHN

Rigid (RMC) with THHN conductors, maximum per trade size
Wire	1/2"	3/4"	1"	1-1/4"	1-1/2"	2"	2-1/2"	3"	3-1/2"	4"
#14	13	22	36	63	85	140	200	309	412	531
#12	9	16	26	46	62	102	146	225	301	387
#10	6	10	17	29	39	64	92	142	189	244
#8	3	6	9	16	22	37	53	82	109	140
#6	2	4	7	12	16	27	38	59	79	101
#4	1	2	4	7	10	16	23	36	48	62
#3	1	1	3	6	8	14	20	31	41	53
#2	1	1	3	5	7	11	17	26	34	44
#1	1	1	1	4	5	8	12	19	25	33
#1/0	1	1	1	3	4	7	10	16	21	27
#2/0	—	1	1	2	3	6	8	13	18	23
#3/0	—	1	1	1	3	5	7	11	15	19
#4/0	—	1	1	1	2	4	6	9	12	16

IMC fill chart, THHN

IMC with THHN conductors, maximum per trade size
Wire	1/2"	3/4"	1"	1-1/4"	1-1/2"	2"	2-1/2"	3"	3-1/2"	4"
#14	14	24	39	68	91	149	211	326	436	562
#12	10	17	29	49	67	109	154	238	318	410
#10	6	11	18	31	42	69	97	150	200	258
#8	3	6	10	18	24	39	56	86	115	149
#6	2	4	7	13	17	28	40	62	83	107
#4	1	3	4	8	11	17	25	38	51	66
#3	1	2	4	6	9	15	21	32	43	56
#2	1	1	3	5	7	12	17	27	36	47
#1	1	1	2	4	5	9	13	20	27	35
#1/0	1	1	1	3	4	8	11	17	23	29
#2/0	1	1	1	3	4	6	9	14	19	24
#3/0	—	1	1	2	3	5	7	12	16	20
#4/0	—	1	1	1	2	4	6	9	13	17

Flex (FMC) fill chart, THHN

Flex (FMC) with THHN conductors, maximum per trade size
Wire	1/2"	3/4"	1"	1-1/4"	1-1/2"	2"	2-1/2"	3"	3-1/2"	4"
#14	13	22	33	52	76	135	202	291	396	518
#12	9	16	24	38	56	98	147	212	289	378
#10	6	10	15	24	35	62	93	134	182	238
#8	3	6	9	14	20	35	53	77	105	137
#6	2	4	6	10	14	25	38	55	76	99
#4	1	2	4	6	9	16	24	34	46	61
#3	1	1	3	5	7	13	20	29	39	51
#2	1	1	3	4	6	11	17	24	33	43
#1	1	1	1	3	4	8	12	18	24	32
#1/0	1	1	1	2	4	7	10	15	20	27
#2/0	—	1	1	1	3	6	9	12	17	22
#3/0	—	1	1	1	2	5	7	10	14	18
#4/0	—	1	1	1	1	4	6	8	12	15

EMT fill chart, XHHW

EMT with XHHW conductors, maximum per trade size
Wire	1/2"	3/4"	1"	1-1/4"	1-1/2"	2"	2-1/2"	3"	3-1/2"	4"
#14	8	15	25	43	58	96	168	254	332	424
#12	6	11	19	33	45	74	129	195	255	326
#10	5	8	14	24	33	55	96	145	190	243
#8	2	5	8	13	18	30	53	81	105	135
#6	1	3	6	10	14	22	39	60	78	100
#4	1	2	4	7	10	16	28	43	56	72
#3	1	1	3	6	8	14	24	36	48	61
#2	1	1	3	5	7	11	20	31	40	51
#1	1	1	1	4	5	8	15	23	30	38
#1/0	1	1	1	3	4	7	13	19	25	32
#2/0	—	1	1	2	3	6	10	16	21	27
#3/0	—	1	1	1	3	5	9	13	17	22
#4/0	—	1	1	1	2	4	7	11	14	18

EMT fill chart, THW

EMT with THW conductors, maximum per trade size
Wire	1/2"	3/4"	1"	1-1/4"	1-1/2"	2"	2-1/2"	3"	3-1/2"	4"
#14	6	10	16	28	39	64	112	169	221	282
#12	4	8	13	23	31	51	90	136	177	227
#10	3	6	10	18	24	40	70	106	138	177
#8	1	4	6	10	14	24	42	63	83	106
#6	1	3	4	8	11	18	32	48	63	81
#4	1	1	3	6	8	13	24	36	47	60
#3	1	1	3	5	7	12	20	31	40	52
#2	1	1	2	4	6	10	17	26	34	44
#1	1	1	1	3	4	7	12	18	24	31
#1/0	—	1	1	2	3	6	10	16	20	26
#2/0	—	1	1	1	3	5	9	13	17	22
#3/0	—	1	1	1	2	4	7	11	15	19
#4/0	—	—	1	1	1	3	6	9	12	16

Worked example: four #10 and three #12 THHN

Conductor area: 4 × 0.0211 + 3 × 0.0133 = 0.1243 in².
1/2" EMT allows 40% of 0.304 in² = 0.1216 in²: too full, by a small margin.
3/4" EMT allows 0.2132 in², so the same seven conductors use 58% of what is allowed. Use 3/4".

For a single wire size, read the count straight from the tables below; mixed sizes always need the area math.

Raceway internal areas (NEC Chapter 9, Table 4)

Total internal area, square inches
Trade size	EMT	IMC	Rigid (RMC)	PVC Sch 40	PVC Sch 80	Flex (FMC)	ENT
3/8"	—	—	—	—	—	0.116	—
1/2"	0.304	0.342	0.314	0.285	0.217	0.317	0.285
3/4"	0.533	0.586	0.549	0.508	0.409	0.533	0.508
1"	0.864	0.959	0.887	0.832	0.688	0.817	0.832
1-1/4"	1.496	1.647	1.526	1.453	1.237	1.277	1.453
1-1/2"	2.036	2.225	2.071	1.986	1.711	1.858	1.986
2"	3.356	3.630	3.408	3.291	2.874	3.269	3.291
2-1/2"	5.858	5.135	4.866	4.695	4.119	4.909	—
3"	8.846	7.922	7.499	7.268	6.442	7.069	—
3-1/2"	11.545	10.584	10.010	9.737	8.688	9.621	—
4"	14.753	13.631	12.882	12.554	11.258	12.566	—

Conductor areas (NEC Chapter 9, Table 5)

Approximate area including insulation, square inches
Size	THHN / THWN-2	XHHW-2	THW / THHW
#14	0.0097	0.0139	0.0139
#12	0.0133	0.0181	0.0181
#10	0.0211	0.0243	0.0243
#8	0.0366	0.0437	0.0437
#6	0.0507	0.0590	0.0726
#4	0.0824	0.0814	0.0973
#3	0.0973	0.0962	0.1134
#2	0.1158	0.1146	0.1333
#1	0.1562	0.1534	0.1901
#1/0	0.1855	0.1825	0.2223
#2/0	0.2223	0.2190	0.2624
#3/0	0.2679	0.2642	0.3117
#4/0	0.3237	0.3197	0.3718
250 kcmil	0.3970	0.3904	0.4596
300 kcmil	0.4608	0.4536	0.5281
350 kcmil	0.5242	0.5166	0.5958
400 kcmil	0.5863	0.5782	0.6619
500 kcmil	0.7073	0.6984	0.7901
600 kcmil	0.8676	0.8709	0.9729
750 kcmil	1.0496	1.0532	1.1652

Dimensional data per NEC 2023, Chapter 9. The THW area column reproduces NEC Chapter 9, Table 5. The THW counts follow the conservative published Annex C (Table C.1) counts, which for #14 to #8 are lower than a direct calculation from those Table 5 dimensions; the conduit fill calculator uses the same conservative basis. Always follow the edition your jurisdiction has adopted.

Sources: NEC 2023: Chapter 9, Tables 1, 4 and 5, Note 7, and Annex C; Conductor areas for THHN/THWN, XHHW and THW from Chapter 9, Table 5. Method.

Questions electricians ask

How many 10 AWG THHN wires fit in 3/4 EMT?

Ten #10 THHN conductors fit in 3/4" EMT. In 1/2" EMT it is 5, and in 1" EMT it is 16.

How many wires can go in 1/2 PVC?

In 1/2" PVC Schedule 40, 8 #12 THHN or 11 #14 THHN. Schedule 80 has thicker walls and holds fewer: 6 #12 or 9 #14.

Do these tables include the ground wire?

Yes, count the ground as one of the wires. The tables assume every conductor is the same size and insulation; for a mix, use the conduit fill calculator.

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