Conduit Fill Chart (EMT)
Maximum number of THHN/THWN-2 conductors at the 40% fill allowance for three or more conductors, computed from the NEC Chapter 9 tables. Use the conduit fill calculator for other conduit types and conductor counts.
| EMT trade size | 14 | 12 | 10 | 8 | 6 | 4 | 2 | 1/0 | 2/0 | 4/0 | 250 | 500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2 in | 12 | 9 | 5 | 3 | 2 | 1 | 1 | 0 | 0 | 0 | 0 | 0 |
| 3/4 in | 21 | 16 | 10 | 5 | 4 | 2 | 1 | 1 | 0 | 0 | 0 | 0 |
| 1 in | 35 | 25 | 16 | 9 | 6 | 4 | 2 | 1 | 1 | 1 | 0 | 0 |
| 1-1/4 in | 61 | 44 | 28 | 16 | 11 | 7 | 5 | 3 | 2 | 1 | 1 | 0 |
| 1-1/2 in | 83 | 61 | 38 | 22 | 16 | 9 | 7 | 4 | 3 | 2 | 2 | 1 |
| 2 in | 138 | 100 | 63 | 36 | 26 | 16 | 11 | 7 | 6 | 4 | 3 | 1 |
| 2-1/2 in | 241 | 176 | 111 | 64 | 46 | 28 | 20 | 12 | 10 | 7 | 5 | 3 |
| 3 in | 364 | 266 | 167 | 96 | 69 | 42 | 30 | 19 | 15 | 10 | 8 | 5 |
| 3-1/2 in | 476 | 347 | 218 | 126 | 91 | 56 | 39 | 24 | 20 | 14 | 11 | 6 |
| 4 in | 608 | 443 | 279 | 161 | 116 | 71 | 50 | 31 | 26 | 18 | 14 | 8 |
Values are computed from tables pending review against the current NEC edition. Verify before use.