Observed arrival · 2026-08-25
AmpSizer: Wire Size & Ampacity
A browser-based set of electrical calculators for wire sizing, ampacity, voltage drop, and conduit fill.
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The calculators expose the arithmetic behind a recommendation, including the published table value, ambient-temperature factor, conductor-count adjustment, and the requirement that governs the result. The reference surface lists 21 conductor sizes from 14 AWG through 750 kcmil, 123 copper and aluminum ampacity values, and 324 worked load-and-distance scenarios. The page attributes its figures to 2023 NEC tables and cautions that local jurisdictions may enforce a different or amended edition.
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