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In a box fill calculation, each 12 AWG conductor counts as how many cubic inches?

2.25 cubic inches for each 12 AWG conductor.

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  1. 2.0 cubic inches
  2. 3.0 cubic inches
  3. 2.25 cubic inches ✔

Why: Larger wire takes more room. A 12 AWG conductor counts as 2.25 cubic inches in Table 314.16(B).

Huh, didn't know that: An unbroken conductor looped at least 12 inches long counts as two conductor volumes.

The dad joke
Why was the 12 AWG wire the big shot? It took up more space.
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References

Answer: 2.25 cubic inches. Larger wire takes more room. A 12 AWG conductor counts as 2.25 cubic inches in Table 314.16(B).

  1. EC&M: NEC Requirements for Sizing Outlet Boxes www.ecmweb.com/code-basics/nec-requirements-sizing-outlet-boxes
    12 AWG, 2.25 cu. in. each
    Checked 2026-10-10.

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