Contact

Write to [email protected] and include the calculator name plus the inputs you used. Concrete reports get fixed fastest.

A calculation looks wrong

This is the report we most want. Send the calculator name, the exact values you entered, what it showed and what you expected. A wrong number is treated as a bug: reproduced, fixed in the engine, and pinned with a test so it cannot come back.

Suggest a calculator

Tell us the question you were trying to answer, not just the tool name — the question is what decides whether it belongs here and how it should work. We build far fewer tools than we are asked for, and we would rather have one page that answers a real question well than five that half-answer it.

An outdated source or method

If a page implements a method that has since been superseded, or cites a source that has been revised, say which page and which source. Health and finance pages carry a "Method reviewed" line precisely so this is checkable from the outside.

Email: [email protected]

Replies usually go out within a few business days.