Accuracy matters

Corrections policy

If a formula, source, or instruction is wrong or unclear, we correct the page and reassess related tools.

Report an issue

Send the page URL, the value or wording in question, the expected result, and any primary source that supports the correction through the contact page.

What happens next

Material calculation or safety issues are reviewed first. Affected results can be temporarily disabled. Confirmed corrections update the page’s review date and are checked across related pages.