Voltage drop, conduit fill, box fill, ampacity, load and motor calculators — worked instantly, with the formula and the NEC article shown. Then drill the questions behind them in Loomi until the math is automatic.
Every category the journeyman exam pulls from.
The NEC journeyman exam is heavy on math. Voltage drop, conduit fill, box fill, and load calculations appear on nearly every state's journeyman test, drawn directly from Chapter 9 tables and Articles 210–430. Getting these right quickly under time pressure is what separates a first-time pass from a re-test — and each calculator here shows the formula and the NEC article, not just the answer.
Every calculator on this page is scoped to the journeyman license exam — not the master exam, not the contractor exam. Results are cross-referenced to the NEC edition so you can look up the rule, understand why the formula works, and use Loomi to drill the underlying questions until the math is second nature.
Loomi turns these calcs into 9,000+ timed, NEC-referenced exam questions, with spaced repetition that hammers your weak spots. Reserve your founders' seat before launch.
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