VoltageDrop is a voltage drop calculator that works out the drop for copper or aluminum wire, suggests the smallest wire size for your amps and distance, and shows how far a wire can run — with no account.
It was built to be fast and private. There are no accounts and no uploads; every calculation happens in your browser. The site may be supported by unobtrusive advertising, which never appears inside the tool itself.
Spotted a bug or want a new feature? Get in touch.