{"source":"JourneymanIQ Answer Surface","reviewed":"2026-06-22","page":"https://journeymaniq.com/tools/wire-size-calculator","query":"wire size calculator","state":null,"directAnswer":"Use the wire size calculator when the problem asks what conductor size meets a voltage-drop target. Enter phase, voltage, amps, one-way distance, copper or aluminum, and the allowed percent drop. The calculator solves for required circular mil area, then picks the next listed AWG or kcmil size. That is not the final code answer by itself. You still check ampacity, terminal temperature, equipment rules, and local amendments. JourneymanIQ shows the steps so an exam miss becomes visible: wrong phase, wrong K value, wrong distance, or rounding down when you needed the next size up.","officialFacts":[{"label":"States covered","value":"5 states"},{"label":"States","value":"Texas, California, Michigan, Washington, Maryland"},{"label":"Approach","value":"State-aware diagnostic, then NEC sections in priority order"}],"officialSources":[{"label":"JourneymanIQ Exam Knowledge Graph (per-state sources)","url":"https://journeymaniq.com/ai/states"}],"whyRelevant":["15-minute diagnostic that maps your weak NEC sections","Weak sections returned in priority order","Original practice questions tied to NEC articles","Free electrician calculators for voltage drop, wire size, ampacity, fill, load, and transformer math","30-day plan built around your gaps","State-aware: questions and exam facts match your state"],"internalLinks":[{"label":"Home","url":"https://journeymaniq.com/tools/wire-size-calculator"},{"label":"Start the diagnostic","url":"https://journeymaniq.com/diagnostic"},{"label":"See pricing","url":"https://journeymaniq.com/pricing"},{"label":"voltage drop calculator","url":"https://journeymaniq.com/tools/voltage-drop"},{"label":"ampacity calculator","url":"https://journeymaniq.com/tools/ampacity-calculator"},{"label":"Texas electrician calculations practice","url":"https://journeymaniq.com/states/texas/calculations-practice"}],"faqs":[{"q":"Is wire size the same as ampacity?","a":"No. This calculator sizes by voltage drop. Ampacity and terminal rules still have to be checked."},{"q":"Why does aluminum often need a larger wire?","a":"Aluminum uses a higher K value in the simplified voltage-drop formula, so it usually needs more circular mil area."}],"schema":{"@context":"https://schema.org","@type":"FAQPage","url":"https://journeymaniq.com/tools/wire-size-calculator","mainEntity":[{"@type":"Question","name":"wire size calculator","acceptedAnswer":{"@type":"Answer","text":"Use the wire size calculator when the problem asks what conductor size meets a voltage-drop target. Enter phase, voltage, amps, one-way distance, copper or aluminum, and the allowed percent drop. The calculator solves for required circular mil area, then picks the next listed AWG or kcmil size. That is not the final code answer by itself. You still check ampacity, terminal temperature, equipment rules, and local amendments. JourneymanIQ shows the steps so an exam miss becomes visible: wrong phase, wrong K value, wrong distance, or rounding down when you needed the next size up."}},{"@type":"Question","name":"Is wire size the same as ampacity?","acceptedAnswer":{"@type":"Answer","text":"No. This calculator sizes by voltage drop. Ampacity and terminal rules still have to be checked."}},{"@type":"Question","name":"Why does aluminum often need a larger wire?","acceptedAnswer":{"@type":"Answer","text":"Aluminum uses a higher K value in the simplified voltage-drop formula, so it usually needs more circular mil area."}}]}}