Our NEC Conduit Fill Chart calculates THWN and THHN wire fill for EMT, IMT, rigid metal, or flexible metal conduit pipe using conduit trade size and AWG or MCM wire size.

Get accurate conduit fill percentages with Southwire's Conduit Fill Calculator. Perfect for electricians, engineers, and contractors.

Oct 27, 2025 · Master conduit fill calculations with our complete NEC guide including fill charts, wire capacity tables, and step-by-step examples. Learn proper conduit sizing for electrical installations.

The NEC sets standards for the percent of volume that can safely be put into conduit. The below chart is from Table 1 in Chapter 9 of the National Electric Code.

Find the right conduit size with our Conduit Fill Table. Easily calculate NEC-compliant fill limits for safe, efficient wiring. Perfect for electricians and contractors.

Aug 2, 2025 · Discover NEC-compliant conduit fill charts for EMT, IMC, Rigid, and Flexible Metal Conduits. Downloadable tables, size-by-size breakdowns, and manufacturer-supplied resources for …

Calculate conduit fill percentages and find the right conduit sizing per NEC Chapter 9 requirements. Works with EMT, PVC, and RMC conduits with accurate wire area calculations for safe installations.

Calculate wire fill percentages, conduit sizing, and electrical installation requirements based on NEC Chapter 9 Tables 1, 4 & 5. Instant results for EMT, PVC, rigid conduit and more.

Calculate conduit fill capacity based on wire size, type, and conduit dimensions. NEC-compliant. Free, fast, and perfect for electricians & engineers.

Explore our conduit wire fill chart to determine the correct number and size of wires to ensure compliance with NEC guidelines and safe electrical installations.