Corrections
If you find a calculation error, an outdated source, or a confusing explanation, you can report it so the content can be reviewed.
How to report an error
Use the contact form and include the affected URL, the result you observed, the result you expected, and the input values you used if the issue involves a calculator.
What we review
We check whether the problem involves the formula, assumptions, wording, a source, a current rate, a link, or an interpretation that could confuse readers.
When a date changes
The update or review date changes only after a substantial correction, source verification, or meaningful editorial revision. Minor corrections may be resolved without changing those dates.
Significant corrections
If a correction changes the meaning of an explanation, formula, warning, or important source, it should be documented in the page or in the internal editorial record.
Send a report
You can send your report through the contact page .