OhmCalc is an Ohm's law calculator that solves volts, amps, ohms and watts from any two values, adds series and parallel resistors and designs voltage dividers — 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.