Conduit Fill Calculator (NEC)
This calculator finds how many same-size cables fit inside a conduit within the standard fill limits. It applies the accepted fill ratios (53 percent for one cable, 31 percent for two, 40 percent for three or more) to the conduit and cable cross-sections. Enter the conduit inner diameter and the cable outer diameter, then toggle the case (1 cable, 2 cables, or 3+ cables) to apply its fill limit and see the most cables of that size the conduit holds.
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 build-ready BOM.
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