Help us keep every calculation accurate

Report a calculator issue

We make every reasonable effort to verify each published formula, input, unit conversion, assumption, rounding rule, and displayed result. Even a very small discrepancy matters to us.

What to include

A useful report tells us enough to reproduce the issue safely:

• The calculator name and its public page URL, without query parameters
• Synthetic or redacted replacement inputs that reproduce the issue
• The result shown for those safe replacement inputs
• The expected result and a public source, when available
• The approximate date and browser or device, if relevant

What happens next

Reports are reviewed for reproducibility, formula scope, and source currency. A confirmed material issue may cause the calculator to be corrected, marked for review, or removed from publication. No response time is promised.