📐 NEC Chapter 9 · Free

Conduit Fill Calculator

Add conductors, pick conduit, see fill percent vs. NEC 2023 Chapter 9 Table 1 limits. Uses Table 5 conductor dimensions and Table 4 conduit areas.

Conductors
SizeInsulationQty
🛠
Conduit
Result
Fill %
Limit (NEC T1)
Conductor Area
Conduit Area
Trace
Add conductors and click Calculate Fill.