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What to Write About

• Report a calculation issue

  Tell us the tool, the inputs you used, the result you got, and the result you expected (with a reference if you have one). Confirmed errors are fixed and pinned with a regression test.

• Suggest a calculator or standard

  Missing a tool you reach for weekly, or need an existing tool to support another code edition? Requests directly shape what gets built next.

• Content corrections

  Spotted an outdated reference, a typo in a formula writeup, or a misleading explanation? Send the page and the correction.

• Anything else

  Questions about the site, advertising, licensing, or data — including anything covered by the privacy policy or terms of use.

Before You Ask

Wondering how your data is handled? See the privacy policy. Wondering whether you can use results in client work? See the terms of use — short answer: yes, but verify against your governing codes first. Curious how the calculators are built and tested? That is on the about page.