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Reporting a calculation error

To help us check it quickly, please include:

the page, for example the Concrete Volume Calculator;
the inputs you used (you can paste the text from "Copy results");
the result you expected, and where it comes from (a textbook, a standard, a supplier's data sheet).

Other messages

Ideas for new calculators are welcome.
Security issues: please email the address above. Our security.txt has the details.
Privacy requests: see the privacy policy.

We read every message but cannot promise a reply time, and we cannot give advice on specific projects. Please do not send sensitive personal information by email.