NEC fill calculators.
Live math engines wired to Article 314.16 volume allowances and Chapter 9 fill tables. Every result shows the work so you can defend it to an inspector.
Article 314.16
Box fill
Conductors
Device yokes
Yoke 1
Equipment grounding conductors
PASSED
22.50 in³ required · 22.50 in³ available
0.00 in³ remaining
- 6 × #12 AWG conductor6 × 2.25 in³ — 314.16(B)(1)13.50 in³
- Internal clamps (1)One allowance at largest conductor #12 AWG — 314.16(B)(2)2.25 in³
- Device yoke 1 (#12 AWG)2 × 2.25 in³ — 314.16(B)(4)4.50 in³
- Equipment grounding conductors (2)One allowance at largest EGC #12 AWG — 314.16(B)(5)2.25 in³
Chapter 9, Table 1
Conduit fill
Conductors
COMPLIANT
0.0399 in² wire · 0.1216 in² allowed
3 or more conductors — 40% (Chapter 9, Table 1) — raceway internal area 0.3040 in² × 40% · 13.1% used
- 3 × #12 THHN / THWN-23 × 0.0133 in² — Chapter 9, Table 50.0399 in²