Online Calculators for Electricians
Cable cross-section calculation, breaker selection, voltage drop, phase balancing, and RCD selection — according to IEC 60364 standards.
Cable cross-section calculation
Cable cross-section selection by power, current and installation method per the app's reference table.
MCB selection by load
Breaker rating and trip curve selection (B/C/D) with coordination and selectivity check.
Voltage drop calculator
Voltage drop calculation in cable with visualization and cross-section comparison.
Phase load balancing
Consumer distribution across phases L1/L2/L3 to minimize imbalance in a three-phase grid.
RCD / RCBO selection
RCD or RCBO type, rating and differential current selection per IEC 60364.
House power calculator
Total load calculation by appliance list. Recommendations for incoming MCB, cable and connection type (1ph/3ph).
Illuminance calculator
Lamp count calculation per EN 12464-1. Floor area, room type, ceiling height, lamp type.
Converter W ↔ A ↔ V
Convert watts to amps for 1ph, 3ph and DC grids. Cos φ, recommended MCB and cable cross-section.
Converter AWG ↔ mm²
American Wire Gauge to metric cross-section reference table. Diameter, ampacity, metric equivalent.
IP Protection Ratings
Interactive IP code reference per IEC 60529. Decode by code or installation location. IP44, IP54, IP65, IP67.
Wire Colors
Wire color marking table per IEC 60445 (formerly IEC 60446). Comparison with legacy and North American standards.
Electricity Cost
Daily and monthly electricity cost calculation. Appliance list, tariff, top consumers and saving tips.
Sticker Generator for Panel
Create and print labels for MCBs, RCDs, RCBOs. Multiple rails, phase colors, exact DIN size. Logo and QR code when printing.
Full Panel Builder
All calculations in one place — with visual editor, drag & drop, and PDF export.
All tools are free. If helpful, I'd appreciate a coffee 🙏
Which calculator to choose for your task
Here are 13 free online tools for designing residential and commercial electrical wiring. All calculators comply with current standards: IEC 60364, IEC 60364 and IEC 60364. No registration, no limits.
🔌 Cable and Wiring Calculations
If you are planning new wiring or replacing a line, start with the cable cross-section calculator (selection by power and current, considering installation method). For long lines, be sure to check voltage drop (IEC 60364 standard: up to 5%). If working with American catalogs — AWG ↔ mm² converter.
⚡ Load, MCBs and protection
For a new panel, first do load calculation for an apartment or house — you will get recommended incoming supply and cable. Then for group circuits — MCB selection (B16 for sockets, C20 for boiler, C25 for electric stove) and RCD or RCBO selection (30 mA for wet areas, 10 mA for children's rooms). For three-phase panels — mandatory phase balance L1/L2/L3 (IEC 60364 standard — imbalance up to 15–20%).
💰 Tariffs, power and consumption
Want to calculate how much appliance operation costs — use electricity calculator 2026 (current tariff — 4.32 UAH/kWh, extended until 31.10.2026). If you need to convert power to current or vice versa — amps ↔ kilowatts converter (1ph, 3ph, DC, with cos φ).
📐 Reference books and standards
For verification during installation: wire colors (phase, neutral, earth per IEC 60445 and IEC), IP protection ratings (IP20, IP44, IP54, IP65 — which to choose for bathroom, outdoors, panel), illuminance calculator (according to IEC 60364) and label generator for panel (print labels for DIN rail).
For complete electrical panel design, use ElectroBoard — a visual constructor with 22 types of modular devices, drag & drop placement, automatic validation per IEC 60364, real-time load calculation, and PDF export. Free, no registration required.