All Tools
Box Fill Calculator
Junction box volume check per NEC 314.16.
Box Type
Custom (enter volume below)
3x2x2-1/4 Device Box (10.5 in³)
3x2x2-1/2 Device Box (12.5 in³)
3x2x2-3/4 Device Box (14.0 in³)
3x2x3-1/2 Device Box (18.0 in³)
4x2x2-1/8 2-Gang (22.0 in³)
4" Square x 1-1/4 (18.0 in³)
4" Square x 1-1/2 (21.0 in³)
4" Square x 2-1/8 (30.3 in³)
4-11/16" Square x 1-1/4 (25.5 in³)
4-11/16" Square x 1-1/2 (29.5 in³)
4-11/16" Square x 2-1/8 (42.0 in³)
4" Octagonal x 1-1/2 (15.5 in³)
4" Octagonal x 2-1/8 (21.5 in³)
3-1/2" Round (6.0 in³)
Largest Gauge
14 AWG
12 AWG
10 AWG
8 AWG
6 AWG
Conductors
Ground Wires
Clamps
Devices (switches/receptacles)
Check Box Fill