Electro Master

Electro Master is a professional electrical calculator app designed for electricians, electrical engineers, and students. Get instant, accurate results — no internet connection required.

FREE CALCULATORS:

⚡ Ohm's Law

Calculate voltage, current, resistance and power. Fill any 2 values and get the rest instantly.

📉 Voltage Drop

Calculate cable voltage drop in volts and percentage for single-phase and three-phase systems. Get warnings when drop exceeds 3% or 5%.

📏 Cable Size

Find the recommended cable cross-section based on current, installation method (conduit, wall, buried), cable length and material (copper or aluminum).

🔐 Fuse / Breaker

Get the recommended circuit breaker size by entering power or current, voltage and system type.

🔋 Power Calculator

Calculate active, apparent and reactive power for single-phase and three-phase systems.

PRO CALCULATORS (€2.99/month):

🔧 Power Factor Correction — Calculate the required capacitor bank to improve cos φ

⚠️ Short Circuit Current — Estimate Isc at transformer secondary

🌍 Grounding Resistance — Single rod estimation with soil resistivity

💡 Lux / Lighting — Calculate the number of lamps needed for any room

PRO PLAN INCLUDES:

✓ 4 advanced calculators

✓ No ads

✓ Auto-renewing monthly subscription — cancel anytime

AVAILABLE IN 4 LANGUAGES:

🇬🇧 English | 🇧🇬 Bulgarian | 🇷🇴 Romanian | 🇷🇸 Serbian

DISCLAIMER:

Calculations are for guidance only and do not replace the judgment of a qualified electrician.