WireFillChart
VerifiedFree NEC 2023 conduit fill calculator and wire fill charts for EMT, PVC, IMC, RMC and flex. Runs in the browser, no signup.
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About
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.