{"source":"JourneymanIQ Answer Surface","reviewed":"2026-06-22","page":"https://journeymaniq.com/tools/transformer-sizing-calculator","query":"transformer sizing calculator","state":null,"directAnswer":"Use a transformer sizing calculator when the problem asks for kVA from volts and amps, or amps from kVA and volts. Single phase uses volts x amps divided by 1,000. Three phase adds the 1.732 multiplier. The exam trap is side selection: primary current uses primary voltage, and secondary current uses secondary voltage. The calculator gives the arithmetic result, not the breaker or conductor answer. JourneymanIQ shows the formula and substitution so you can see whether the miss was phase, voltage side, kVA-to-VA conversion, or confusing current with overcurrent protection.","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/transformer-sizing-calculator"},{"label":"Start the diagnostic","url":"https://journeymaniq.com/diagnostic"},{"label":"See pricing","url":"https://journeymaniq.com/pricing"},{"label":"wire size calculator","url":"https://journeymaniq.com/tools/wire-size-calculator"},{"label":"ampacity calculator","url":"https://journeymaniq.com/tools/ampacity-calculator"},{"label":"Maryland electrician exam calculations practice","url":"https://journeymaniq.com/states/maryland/calculations-practice"}],"faqs":[{"q":"How do I find transformer current from kVA?","a":"Multiply kVA by 1,000, then divide by volts for single phase or volts times 1.732 for three phase."},{"q":"Is transformer current the breaker size?","a":"No. It is the arithmetic result. Overcurrent protection depends on the code rule in the question."}],"schema":{"@context":"https://schema.org","@type":"FAQPage","url":"https://journeymaniq.com/tools/transformer-sizing-calculator","mainEntity":[{"@type":"Question","name":"transformer sizing calculator","acceptedAnswer":{"@type":"Answer","text":"Use a transformer sizing calculator when the problem asks for kVA from volts and amps, or amps from kVA and volts. Single phase uses volts x amps divided by 1,000. Three phase adds the 1.732 multiplier. The exam trap is side selection: primary current uses primary voltage, and secondary current uses secondary voltage. The calculator gives the arithmetic result, not the breaker or conductor answer. JourneymanIQ shows the formula and substitution so you can see whether the miss was phase, voltage side, kVA-to-VA conversion, or confusing current with overcurrent protection."}},{"@type":"Question","name":"How do I find transformer current from kVA?","acceptedAnswer":{"@type":"Answer","text":"Multiply kVA by 1,000, then divide by volts for single phase or volts times 1.732 for three phase."}},{"@type":"Question","name":"Is transformer current the breaker size?","acceptedAnswer":{"@type":"Answer","text":"No. It is the arithmetic result. Overcurrent protection depends on the code rule in the question."}}]}}