Free Electrical Calculators for Electricians & Homeowners
Wire size, voltage drop, breaker size, solar and energy cost tools based on the National Electrical Code. Instant results, no sign-up.
- ✓ NEC 2023, the most-adopted edition
- ✓ 55+ free calculators
- ✓ No sign-up
Wire & Cable Sizing
12 toolsNEC-compliant wire sizing, voltage drop, conduit fill, and ampacity tools
Power & Electrical
10 toolsOhm's law, watts/amps conversion, power factor, and 3-phase calculations
Energy Cost & Consumption
8 toolsElectricity costs, appliance running costs, and energy usage calculators
Solar & Renewable
7 toolsSolar panel sizing, ROI, battery bank, inverter, and charge controller tools
Lighting
5 toolsLumens, watts, lighting levels, and cost calculators
Circuit & Panel
7 toolsBreaker sizing, load calculations, grounding, transformers, and motor starters
Unit Converters
6 toolsQuick conversions between electrical and energy units
Featured Tools
5 toolsTrending calculators for home electrification, solar, and electrical projects
Latest from the Blog
Guides, tutorials, and electrical calculadora tips in English and Spanish
Calculadora de Calibre de Cable Eléctrico: Guía NOM 2026
Tablas NOM-001-SEDE, fórmulas de caída de tensión, comparación cobre vs aluminio.
ES Tarifas CFECosto de Electricidad en México por Estado: Tarifas CFE 2026
Precios por kWh, cómo evitar tarifa DAC, ejemplos de recibo real.
ES SolarPaneles Solares en México: Costo y Calculadora 2026
Costo de instalación, ROI, mejores marcas y financiamiento.
ES Autos EVCargador de Auto Eléctrico en Casa: Costo e Instalación 2026
Tipos de cargadores, costos, requisitos eléctricos y tiempos de carga.
ES Energía¿Cuánto Consume un Aire Acondicionado? Calculadora 2026
Consumo por tonelada, costo mensual, comparación inverter vs convencional.
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Guides in English, Spanish, German & French
Built for the Job Site
Every calculator is designed for mobile-first use. Get accurate, NEC-compliant results on your phone while you work. Bookmark your favorites for quick access on every job.