Calculation worksheet
Box fill
Check common insulated conductors, yokes, clamps, and equipment grounds.
Enter your values and select Calculate to see a step-by-step result.
Reference2023 NEC 314.16(B)(1), (2), (4), (5) and Table 314.16(B)
Assumes all counted conductors and grounds use the chosen AWG. Support fittings, terminal blocks, mixed conductor sizes, and other allowances are not included.