Corrections log
When we get something wrong, we fix it and record it here: what was wrong, which results it affected, and when.
No corrections yet. The site launched in October 2026. This page will list every substantive error we fix, with the date, the page, what was wrong, the inputs affected and the engine version that fixed it.
Report a problem
Use the “report a problem” link under any calculator (it sends us your exact inputs), or the contact form. We aim to acknowledge reports within 72 hours. Serious errors are also flagged on the affected page for 90 days after the fix.
What we log
- Any wrong result, table value or worked example, however small.
- Any wrong code citation or edition.
- Any misleading explanation that could lead to an unsafe choice.
Typos and wording changes that don’t change meaning are not logged.
Last updated 2026-10-14.