Contact

Report a correction or site issue

A reproducible report helps distinguish a formula error from a difference in units, product assumptions, local requirements, or project conditions. Use the template below and avoid sending private customer, account, or payment information.

Email reporting is not enabled on this deployment. The site owner must configure and verify a public contact mailbox before an email link will appear. You can still prepare the report below so the details are ready when a contact method is published.

Correction report template

Include units and the exact values entered. Link to an authoritative code, manufacturer label, standard, or agency page when one is relevant. Do not include passwords, access tokens, financial account details, or information you are not authorized to share.

Page or calculator name:
Page URL:

Issue type (formula, source, content, accessibility, privacy, or other):
What were you trying to do?

Inputs entered (include units):
Result shown:
Expected result or behavior:

Why you believe it should change:
Supporting source or product-label URL, if available:

Browser/device, if relevant:
Anything else needed to reproduce the issue:

Report a formula or source issue

Share reproducible inputs, the result shown, the result you expected, and any source that supports the report.

Report a usability or accessibility issue

Describe what you were trying to do, where you got stuck, and the browser, device, or assistive technology involved if relevant.

Suggest a calculator or improvement

Explain the job, decision, or quantity you need to estimate and the inputs or reference method you would expect it to use.

Correction handling is documented in the editorial & corrections policy. For information about saved inputs, shared links, and third-party services, see privacy & calculator data.