Calculate conduit fill percentage per NEC Chapter 9 Table 1 (EMT, IMC, RMC, PVC, HDPE) or IEC practice. Instant pass/fail against code limits.
// INPUTS
// Results update automatically as you type
// CONDUIT
// CABLE GROUPS
inches (NEC)
Conduit Internal Area—in²
Total Cable Area—in²
Fill Percentage—%
Permitted Fill Limit—%
Status—
Disclaimer: For reference and preliminary estimation only. Verify results against the applicable code, project specification, and equipment data before use in design documents.
// EXCEEDS LIMIT — RECOMMENDATIONS
Please check inputs — all values must be positive.
// RELATED TOOL
Ductbank-LMX
DUCTBANK‑LMX is a two-part toolkit that provides fast, consistent, defensible duct bank dimensions for early-stage design, routing studies, and field coordination. It includes an Excel workbook for generating dimensions and an AutoCAD LISP/FAS utility that draws duct bank cross-sections with a single command.