Ohm’s Law Calculator

Here is a simple calculator for power, current, voltage and resistance (actually there are 6 different calculators, use the one relevant to the values you know and the values you need to know.


For a better understanding of what all this means, read the articles on the What is Electrical Power and The Dreaded Ohm’s law.

Here is a quick reference with all the possible formula combinations. You may like to print it out and stick it to your multi-meter case or workshop wall for handy future reference.

Please Note: During the Covid-19 pandemic I'm busy with a number of streaming projects, and have very limited time to attend to this website. I'm currently taking up to a week to answer questions. Sorry for any inconvenience.

Disclosure: If you buy through this Amazon USA link Geoff receives a small commission from each sale.
European and Australian readers can use the links on the side panel - Thanks for the support

Submit a question or comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.