Box Selector
NEC 2020Enter your fill — see which boxes from Table 314.16(A) legally fit.
Fill
§314.16(B)
Conductors
14 AWG2.00 in³ ea.
12 AWG2.25 in³ ea.
Pigtails under 6" that don't leave the box are not counted per NEC 314.16(B)(1).
Other Fill — §314.16(B)
Ring / Extension — §314.16(A)
in³
Volume marked on plaster ring or extension ring.
Required Volume
Add at least one conductor to calculate required volume.
Passing Boxes
§314.16(A)
Enter conductor fill above to see which boxes fit.