About ElecCalcs

What this site is

Every result shows the formula, the substituted values and the code table or article it comes from, so the working can be checked rather than taken on trust.

How it is built

The calculations live in a small, dependency-free core with its own test suite. Each constant carries a reference to the code table it came from and a review status, and the methodology page is generated from that registry rather than written by hand — so it cannot drift from the code.

Calculations run in your browser. The values you type are not sent to our servers.

Review status

Reference values are based on NEC 2023 and are being checked by a licensed professional. 27 constants are still marked as pending. The NEC table values on this site reflect NEC 2023. The 2026 edition and local amendments have not been verified.Until that review is complete, treat results as unreviewed and confirm anything you rely on for construction against the edition your authority enforces.

Found an error?

Please tell us. Corrections to a reference value or a formula are the most useful thing you can send. Email [email protected] with the page and what you expected.

Contact

[email protected] — see also our terms and privacy policy.