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Junction Box Sizing Calculator
Calculate minimum required electrical box volume per NEC standards
NEC Box Fill Standard (NEC 314.16): Box volume is determined by conductor size volumes (14 AWG = 2.0 cu in, 12 AWG = 2.25 cu in, 10 AWG = 2.5 cu in), plus allowances for internal clamps, grounding wires, and switches/outlets.
Conductor & Device Parameters
Calculation Results
⚠️ NEC regulations require adequate box capacity to prevent overheating and insulation damage. Always verify standard box volume stamp ratings before installation.