About WirePhase
WirePhase is a free collection of fast, mobile-friendly electrical calculators built for the people who actually do the work: electricians, contractors, engineers, trade students and serious DIYers across the United States and Canada.
Who We Are
WirePhase is an independent online project that publishes free electrical calculators and learning resources. It is not affiliated with NFPA, CSA Group or any government body.
Our Mission
Make accurate, code-aware electrical calculations instant and accessible on any phone, at the job site or the classroom, with no sign-ups, no paywalls and clear explanations of the math behind every result.
Engineering Accuracy
- Code-based: Calculators use published NEC (NFPA 70) tables and formulas and cite the relevant articles, such as 310.16, 430.248/250 and Chapter 9.
- Transparent: Every tool shows its formula, assumptions and a worked example so you can verify results yourself.
- Open to corrections: Table values are transcribed from published NEC tables and may contain errors or differ from your adopted edition. Please report anything that looks wrong so we can fix it.
- Honest limits: Results are estimates for education and planning. See our Electrical & Legal Disclaimer; always confirm with a licensed electrician and your local authority.
Content and Corrections
Our guides are intended to explain the reasoning behind common electrical calculations, not to replace the adopted code or a professional review. We aim to identify formulas, assumptions and relevant references, and we welcome reports of mistakes or unclear explanations. A reference to a code article is a starting point for verification, not a guarantee that a result complies with every local amendment or installation condition.
When a tool or article changes, we update its explanation where practical. Please include the page URL, the inputs used and the source or code edition you believe is relevant when reporting a correction.
Privacy and Advertising
Your calculator inputs stay in your browser. The Site is supported by advertising; ads are clearly separated from content. Details are in our Privacy Policy.
Found an Error?
Corrections make the tools better. Send the inputs you used, the result you saw and the reference you expected; we review reports promptly.
Contact Us
Email: admin@wirephase.net · Typical response time: 2 to 3 business days. We cannot provide electrical design advice or code rulings; contact your local AHJ or a licensed electrician.