Corrections policy.
Cost data changes and mistakes can happen. We make it straightforward to report and correct material errors.
Report an issue
Send the page URL, the statement or figure you believe is incorrect, and a reliable supporting source through our contact form. The destination email remains hidden from the public page.
Our review
We compare reports with primary or authoritative sources and review any calculation configuration involved. Commercial requests do not receive special treatment.
What happens next
Material errors are corrected promptly. When a change affects a calculator model, we update its version or freshness date and retest the calculation logic. Minor spelling or formatting fixes may be made without a notice.