Contact

Report an error or request a calculator

The fastest way to reach this site is to submit a calculator request or error report through the request form below. For factual corrections, include the page URL, the inputs you used, the result you saw, and what you believe is wrong.

If you are reporting a finance issue, include whether the problem is in the formula, the assumptions, the wording, or the disclaimer language. If you are reporting a map issue, include whether the problem is in the image workflow, the Leaflet interaction, or the Bing Hybrid basemap display.

Missing something?

Request a new calculator

If the tool you want is not here yet, describe it. This creates a clean request you can copy, share, or email in one tap.

Describe the calculator and send the request.

What happens when you submit

  • The form submits to the site’s `/api/calculator-request` endpoint.
  • If you choose follow-up, your email address is included with the request.
  • Requests are delivered through the site’s configured email processor so the maintainer can review them.
  • Do not send passwords, payment-card details, or other sensitive data through this form.

Last reviewed: July 23, 2026