Conduit Fill Calculator (AVIXA / NEC)
This calculator finds how many same-size cables fit inside a conduit within the AVIXA fill limits: 53 percent of the cross-section for one cable, 31 percent for two, 40 percent for three or more, keyed to the number actually installed. The limits originate in NEC Chapter 9 Table 1, and the calculator holds the flat maxima, so its answer satisfies both authorities. Enter the conduit inner diameter and the cable outer diameter to get the most cables of that size the conduit legally holds, with the planned-count fit check alongside.
This runs on the same engine as the agents
On the calculator the math stands alone. Inside Avria it runs across a whole room, cites the clause behind every call, and lands in a complete BOM you can check line by line.
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