Last updated: August 26, 2026
We welcome feedback about calculators, content, translations and the user experience.
When to contact us
You can report an unexpected result, formula issue, broken page or link, translation problem, or suggest a new calculator.
Useful information for bug reports
Please include the calculator name, page URL, values entered, result shown and expected result when possible.
Responses
We aim to review important messages about errors and content, but cannot guarantee a reply to every message or provide individual professional advice.