Worth telling us about
- A wrong result. The most useful message we can get. Include the numbers you entered and the answer you expected — that turns a bug report into a test case.
- A missing calculator. If you came looking for something and left without it, we would rather know.
- Something that reads wrong for your country. The site is written for a global audience and occasionally slips. See the about page on why that matters to us.
- Privacy, licensing or press. Covered by the privacy policy and terms, but ask if something is unclear.
We read everything and reply to most things, usually within a few days. What we will not do is add you to a mailing list — there isn't one.