What to include in your message
Helpful feedback usually includes the page you were using, the exact value you entered, the output you received, and the output you expected. For conversion tools, small examples are better than broad descriptions because they make it easier to reproduce the issue and decide whether the problem is input validation, formatting, calculation, or page copy.
You can also suggest new calculator pages. Good suggestions are specific search questions or repeated conversion tasks, such as a common fraction-to-decimal query, an additional base conversion, or a clearer explanation for a term that appears in programming classes and technical documentation.