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What to write about

Calculation errors, broken pages, accessibility barriers, embedding and licensing, and press enquiries. There is no ticketing system between your message and the person who can act on it, so it helps to put the specifics in the first email — the sections below say what makes a report quick to act on.

Reporting an error in a calculation

This is the most valuable thing anyone sends. If a figure looks wrong, please include the calculator's name, the exact inputs you used, the result you got, the result you expected, and — if you have one — the standard or table you are checking against.

Every calculator carries pinned test cases. A confirmed error becomes a new test case as well as a fix, so the same mistake cannot return.

Reporting a broken page or an accessibility barrier

Please include the page address, your browser and device, and what happened compared with what you expected. For an accessibility barrier, the assistive technology you were using helps a great deal.

What cannot be answered

Project-specific engineering questions cannot be answered. Whether a particular beam suits a particular span, or a circuit satisfies a local amendment, needs somebody who can see the job and take responsibility for the answer. That is a qualified professional, not a calculator and not its authors.