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Electrical calculators: cable sizing, voltage drop, Zs, RCD, PV — fully offline
Electro Master is a professional electrical calculator app for electricians, electrical engineers and students. Instant, accurate results — no internet connection required. FREE CALCULATORS: ⚡ Ohm's Law — voltage, current, resistance and power. Fill any 2 values. 📉 Voltage Drop — drop in volts and percent, single and three-phase, with 3% / 5% warnings. 📏 Cable Size — cross-section from current, installation method, length and material. 🔐 Fuse / Breaker — protection size from power or current. 🔋 Power — active, apparent and reactive power. ALSO FREE: ✓ Projects — notes, photos and a circuit list for every job ✓ Calculation history — reopen any calculation with its values ✓ Search across calculators, reference tables and projects ✓ Light and dark theme ✓ Works completely offline PRO CALCULATORS: Cables and installation • Cable sizing to IEC 60364-5-52 — temperature and grouping derating, PVC/XLPE, up to 240 mm² • Conduit fill — fill percentage and the smallest suitable conduit Protection • Loop impedance Zs — automatic disconnection for TN and TT, plus maximum cable length • RCD selection — type, sensitivity, standing leakage and selectivity • Selectivity — between breakers or gG fuses • Short circuit current — Isc at the transformer Motors and power • DOL and star-delta starters • Power factor correction • Transformer, generator and UPS sizing Solar • PV string design — modules per string at cold and hot extremes, string fuses, DC cable • Battery bank sizing Plus grounding resistance and lighting (lux) calculators. PRO ALSO INCLUDES: ✓ Offline reference tables — ampacity, AWG, wire colours, breaker curves, IP ratings and more ✓ Branded PDF reports with your company logo ✓ Circuit schedule — every calculation in a project exported as one PDF ✓ No ads ✓ Auto-renewing monthly subscription — cancel anytime AVAILABLE IN 5 LANGUAGES: 🇬🇧 English | 🇧🇬 Bulgarian | 🇷🇴 Romanian | 🇷🇸 Serbian | 🇪🇸 Spanish DISCLAIMER: Calculations are for guidance only and do not replace the judgment of a qualified electrician. Verify results against the national edition of the applicable standard.