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Corrections policy

Accuracy matters more than preserving a clean record. We investigate reproducible calculator errors and material editorial issues promptly.

Report an issue

Use the contact page and include the page URL, inputs used, expected result, observed result, and any supporting source.

What happens next

We reproduce the issue, check the governing formula or source, add a regression test when appropriate, and publish the correction. Material changes update the page review date and are described in the relevant methodology or source note.