About WireGaugePro
Free, professional-grade wire sizing tools built by electrical engineers for electricians, engineers, and anyone working with electrical wiring.
Our Story
WireGaugePro was built by a team of electrical engineers and licensed electricians who saw a clear need: existing wire sizing resources were either outdated reference tables buried in PDFs, or oversimplified tools that ignored critical factors like voltage drop and temperature derating.
We set out to create a modern, web-based calculator that applies the same engineering formulas professionals use in the field -- but makes them accessible to anyone, whether you are a master electrician sizing a commercial service entrance or a homeowner wiring a garage subpanel.
Every calculation on this site follows industry-standard methods referenced in the National Electrical Code (NEC/NFPA 70) and uses conductor data from recognized standards. The tool is free, requires no registration, and stores no personal data.
Editorial Standards
All technical content on WireGaugePro is developed and reviewed by licensed Professional Engineers (PE) and Master Electricians. Our editorial process ensures accuracy and reliability:
- Calculation formulas are verified against NEC (NFPA 70) tables and IEEE standards
- Blog articles and guides are fact-checked by team members with hands-on field experience
- Content is updated when new NEC editions or industry standards are published
- External references link to authoritative sources including NFPA and UL
Our Team
The WireGaugePro Editorial Team combines expertise in electrical engineering, software development, and technical education. Our contributors include licensed Professional Engineers (PE) and Master Electricians with over 20 years of combined industry experience spanning residential, commercial, and industrial projects.
Engineering Team
Licensed Professional Engineers who develop and verify our calculation algorithms against NEC standards and real-world field conditions.
Field Electricians
Master Electricians who review content for practical accuracy and ensure our tools reflect real job-site requirements and best practices.
Technical Writers
Specialists in electrical education who translate complex engineering concepts into clear, actionable guides for all experience levels.
Who Uses Our Tools
Professional Electricians
Licensed electricians use our tools for quick on-site wire sizing verification, ensuring compliance with local electrical codes before pulling wire.
Electrical Engineers
Engineers rely on our calculators when designing electrical systems, conducting load calculations, and specifying appropriate conductor sizes for projects.
DIY Enthusiasts
Homeowners and DIYers use our tools for home improvement projects, from wiring a workshop subpanel to installing EV chargers and solar panel systems.
Students & Educators
Electrical engineering students and instructors use our calculators and guides as learning resources to understand wire sizing principles and NEC requirements.
Key Features
Comprehensive AWG Support
Supports wire sizes from AWG 20 to AWG 0000 (4/0), covering virtually all residential, commercial, and industrial applications.
Copper & Aluminum Support
Calculate wire gauge for both copper and aluminum conductors, accounting for each material's different conductivity and ampacity characteristics.
Imperial & Metric Units
Enter wire length in feet or meters. Results display in both unit systems for international compatibility.
Detailed Results
View voltage drop percentage, wire resistance, maximum ampacity, and safety recommendations for every calculation.
Export & Share
Export calculation results as a text file or share them via clipboard for documentation and team collaboration.
Mobile Friendly
Fully responsive design works on desktop, tablet, or smartphone -- use it on the job site or at your desk.
Our Commitment
Free Forever: All tools on this site are free to use with no registration, hidden fees, or usage limits.
Privacy Focused: We do not store your calculation data. Your wire sizing information stays private and secure.
Continuously Improved: We regularly update our tools when new NEC editions are published and add features based on user feedback.
Educational Resource: Beyond calculations, we provide in-depth guides and articles to help you understand the engineering behind wire sizing.
Important Disclaimer
While our calculators provide accurate results based on standard engineering formulas and NEC reference data, they should be used as a guide only. Always consult with a licensed electrician or electrical engineer for critical installations. Verify all wire gauge selections against local electrical codes and regulations before implementation.