Professional Electrical Tools
Electrical Calculatorsfor Professionals
Free, practical electrical calculators for electricians, engineers, students, and technical teams working with U.S.-focused workflows.
125
Public calculators
NEC
U.S.-focused reference
Free
Access model
Most Used Calculators
Start with the calculators that support the most common day-to-day electrical workflows.
Basic
Ohm's Law Calculator
Calculate voltage, current, resistance, and power relationships.
Wire
Wire Size Calculator
Check conductor sizing for safe and code-aware installations.
Circuit
Voltage Drop Calculator
Review conductor voltage drop across distance and load conditions.
Power
Power Calculator
Work through AC and DC power calculations for common scenarios.
Safety
Breaker Sizing Calculator
Estimate breaker sizing against load and protection needs.
Cost
Electricity Cost Calculator
Estimate energy cost and operating expense for electrical loads.
Solar
Solar Planning Hub
Start solar PV production, sizing, storage, inverter, and ROI workflows.
Find Tools for Your Work
Choose an entry point that matches how you use electrical calculations in practice.
For Electricians
Field-ready tools for conductor work, protection checks, and everyday installation planning.
For Engineers
Reference tools for design review, fault screening, coordination planning, and system checks.
For Students
Clear starting points for formulas, circuit behaviour, and calculator-driven study.
Browse by Category
Jump into the category that best matches the calculation family you need.
Basic Electrical
Core voltage, current, resistance, power, and energy formulas.
Circuit Analysis
Series, parallel, divider, RC, and voltage-drop workflows.
Wire & Cable
Wire sizing, ampacity, gauge conversion, and raceway fill.
Power Systems
Transformer, power factor, harmonic, and distribution tools.
Safety
Breaker, fault-current, grounding, and arc-flash screening.
Testing
Megger, shunt, relay, and field-testing support.
Motors
Motor current, starting, branch protection, starter, and load checks.
Lighting
Lighting load, illuminance, LED, and fixture-planning tools.
Cost Analysis
Electricity cost, appliance energy, and savings estimates.
Residential
Dwelling load, panel load, outlet, and service sizing.
Renewable Energy
Solar, storage, inverter, and EV charging sizing.
Conversion Tools
Unit conversion and component-marking lookups.
NEC Code Compliance
Box fill and pull-box sizing under NEC 314 for U.S. rough-in work.
Conduit Bending
Offset, kick, saddle, segmented, and rolling-offset conduit layout.
Components
Capacitor and inductor calculation workflows.
Business
Quote, ROI, and contractor planning tools.
What is EleCalculator?
EleCalculator.com brings together electrical calculators, formulas, field references, and learning resources for common technical checks.
The goal is to make common electrical calculations easier to find, easier to reuse, and easier to pair with supporting guidance when users need more than a single numeric output.
Why teams use it
Electricians, engineers, and learners use these tools for fast answers, reliable references, and repeatable workflows.
U.S. Market
NEC-Oriented Workflows
Use calculators, references, and learning paths for common U.S. electrical work and NEC-based decision making.
Connected Tools
Easy Tool Handoffs
Move from a quick calculation to a related chart, guide, or reference without losing the task context.
Daily Access
Built for Repeated Use
Whether you need a fast field answer or a tool you return to every week, the workflow stays clear, fast, and easy to reuse.
Need personalized help?
Reach out if you want to report an issue, request a calculator, or ask a question about the public tool library.