WireHint

Fast, offline calculators for electricians: Ohm's Law, voltage drop, wire gauge, ampacity, box fill, NEC tap rules & more. No account, no ads.

WireHint is a fast, offline calculator toolkit built for electricians, apprentices, and anyone who works with wiring, panels, and circuits. No account, no ads, no internet required - just accurate math and code references in your pocket.

DAILY TOOLS (free) • Ohm's Law • Voltage Drop • Wire Gauge (AWG ↔ mm²) • Power Calculator • Unit Converter • Decimal ↔ Fraction • Transformer • Battery Runtime • LED Load • Lighting Layout

CODE & TABLES (Pro) • Ampacity Lookup • Conduit Fill • Box Fill • Motor FLC • Conduit Bending • Breaker Sizing • Dwelling Load (NEC Art. 220) • Grounding Sizing • Tap Rules (NEC 240.21) • EV Charger Circuit

REFERENCE (Pro) • Wire Color Code Reference • NEC Quick Reference

WHY WIREHINT • Built for the field - clean, fast, no clutter or sign-in walls • Works completely offline, on the job site or in the basement • Favorites and saved results so your go-to calculators and past jobs are one tap away • Optional AI Insight button gives plain-language explanations of a result, powered by on-device Apple Intelligence where available • One-time Pro unlock - no subscription

Unlock every Code & Tables and Reference calculator with a single one-time purchase. Daily Tools are free forever.

WireHint is a reference and estimation tool. Always verify final designs and installations against the current National Electrical Code and your local Authority Having Jurisdiction (AHJ).