Contact

Questions about the site or a calculator? Send a short email. Use it to report a wrong number, suggest a calculator, or ask a general question about the site.

Messages are read by a person, and replies go to the address you wrote from. Your email address is used only to reply and is never shown publicly.

What to include

• For a calculator: the calculator name, the numbers you entered, and the result you expected.
• For anything else: a short description and, if relevant, the page address.

We cannot provide installation quotes, electrical inspections, or recommendations for specific contractors.