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Fill this in and it lands in an inbox read by a human. Corrections get read first, and if you leave an address we will reply to it.

A few words. This becomes the subject line, so name the calculator if there is one.
For a correction, the useful three things are: which calculator, what you entered, and what you expected to see.

Your name, address and message are used to answer you and nothing else. See the privacy policy.

What gets answered fastest

  • A formula looks wrong. Tell us which calculator, what you entered and what you expected. These jump the queue.
  • A figure is out of date. Appliance wattages, EV battery capacities and product prices all drift. A link to a spec sheet helps enormously.
  • A calculator you wish existed. Tell us the question you were trying to answer, not just the tool name. The question is the useful part.

What we cannot do

We cannot design your electrical system, approve a plan, or tell you whether a specific installation meets your local code. Those need a licensed professional who can see the actual site. We also do not accept paid placements or sponsored recommendations.