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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 and the NEC Chapter 9 Table 1 status. Also box fill, pull box, voltage drop and wire size calculators. No signup. Reference only; independent, not affiliated with NFPA.
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