Last updated: November 12, 2026
Accuracy is the reason CentMath exists. If a calculator gives a wrong result, uses an outdated fee or explains something incorrectly, we want to know and fix it quickly.
How to Report an Error
Use the contact form and choose "Report a calculator error" as the topic. To help us check the problem quickly, please include:
- The name or link of the calculator
- The values you entered
- The result you received and the result you expected
- A link to the source that supports the expected result, if you have one
How Reports Are Handled
- Acknowledgement. Every report is read, and you receive a reply, usually within two business days.
- Verification. The calculator is tested again against its cited source and the example you provided.
- Fix. Confirmed errors are corrected as a priority, and the calculator is retested before the fix goes live.
- Follow-up. You are told what was changed, or why the original result was correct.
How Corrections Are Shown
When a correction changes a calculator's result or a stated figure, the page's last-updated date is changed and a short note describing the correction is added to the page. Minor fixes, such as typos or layout changes, update the date without a note.
Suggestions and Missing Features
If a calculator is correct but missing an option you need, such as another currency, a reverse calculation or a different fee type, please let us know. Requests are reviewed and added where they help other users too.