WireFillChart

What is WireFillChart?

WireFillChart is a free, browser-based NEC 2023 wire fill chart and conduit fill calculator for US electricians, inspectors, engineers and students. Pick a conduit type (EMT, IMC, RMC, PVC Schedule 40/80, FMC, LFNC, ENT), add THHN, THWN-2, RHH, RHW-2 or TW conductors, and read the live fill percentage, the NEC Chapter 9 Table 1 status (53/31/40% budgets, including Note 7 rounding) and a geometric jamming-risk hint; on overfill it recommends the next trade size. The site also has fill charts by conduit and wire type, box fill, pull box, conduit bend offset, voltage drop and wire size calculators, AWG/kcmil converters, and guides to NEC Chapter 9 Tables 4 and 5 and Table 310.16. No signup. Supported by advertising (Google AdSense) and uses Google Analytics. Reference only: verify against the adopted code and your AHJ. Independent; not affiliated with NFPA.

WireFillChart features

• Live conduit fill percentage against NEC Chapter 9 Table 1 limits (53/31/40%)
• Supports EMT, IMC, RMC, PVC Schedule 40/80, FMC, LFNC and ENT conduit
• Recommends the next trade size when a conduit is overfilled

Who uses WireFillChart and for what

• Electricians checking conduit fill before a pull
• Inspectors and students verifying NEC Chapter 9 Table 1 and Note 7 results

WireFillChart FAQ

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