WireMath
Free wire size, voltage drop, ampacity and conduit fill calculators based on NEC tables.
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Estimates for planning only, based on NEC 2023 Table 310.16 (≤3 current-carrying conductors, 30 °C ambient) and Chapter 9 resistance values. Local codes, terminal ratings, derating and inspection requirements govern. Electrical work can be dangerous - hire a licensed electrician. © 2026 WireMath.