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This is the most valuable thing you can send us. Use the report an error form — it asks for the calculator, what you entered and what you expected, which is exactly what we need to reproduce the problem.

Tell us what you were trying to work out and where you looked for it. Requests that describe the underlying problem are far more useful than a bare calculator name, because they often reveal that an existing tool nearly does the job and just needs an extra input.

Include the page, what you were trying to do, and your browser or assistive technology. See the accessibility page for what is already known.

See the advertising page first — it sets out what we will and will not accept, which saves everyone time.

Email mokshtech6@gmail.com.

We read everything. We cannot promise a reply to every message, but reports of genuine calculation errors are prioritised over everything else.