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Box Fill Calculator
Calculate NEC electrical box fill volume and conductor allowances
NEC Standards (Article 314.16):
• 14 AWG = 2.00 cu in | 12 AWG = 2.25 cu in | 10 AWG = 2.50 cu in | 8 AWG = 3.00 cu in
• 14 AWG = 2.00 cu in | 12 AWG = 2.25 cu in | 10 AWG = 2.50 cu in | 8 AWG = 3.00 cu in
Conductor & Box Parameters
Calculation Results
⚠️ NEC box fill calculations account for wire fill, device yokes, internal clamps, and grounding conductors. Always verify box volume markings stamped inside the electrical box.