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There is no contact form, because a form on a site with no server would either not work or would send your message through somebody else's. Email goes straight to the person who can act on it.

Reporting a figure that looks wrong

This is the message worth sending. There are 181 constants across 60 calculators; sources get revised, prices move, and a figure that was right when it was checked can stop being right. Somebody standing in front of the real thing will notice before any test does.

Four things make a report actionable, and the first two are enough on their own:

• Which calculator, and what you entered. The link that reopens your calculation is best: press Copy link to this calculation under the results and paste it in. It carries the inputs, so the exact figures can be reproduced.
• What you expected instead, and why. A measurement, a quote, a product label, a supplier's figure. Even "the tin says 320 sq ft, not 350" is enough to start.
• Where you are, roughly. Most cost figures are national averages and most material figures are not, so knowing whether a gap is regional saves a round trip.
• Anything that reads wrong even if the number is right. An assumption that does not apply to your job, a sentence that misleads, a source that no longer says what it did.

What happens to a correction

The figure is checked against the source it claims. If the source has changed, the constant changes with it and its record is updated with the new publication and retrieval date. If the source never said it, that is a worse problem and the number is either re-derived or removed.

A change that alters an answer is published rather than quietly deployed, so a reader who used the old figure can see that it moved and why. Every correction made so far is on the corrections page. How constants are chosen and re-checked is set out in the methodology, and the process is in the editorial policy.

Other things worth writing about

• A calculator that does not exist yet. Say what you were trying to work out and what you had to hand; that is more useful than a name, because it says what the tool would need to ask for.
• Something that does not work. A control you could not operate, a result you could not read, a page that broke on your phone. Which browser and roughly which device helps.
• Using a calculator elsewhere. Linking to one from a publication or a course is welcome and needs no permission. Embedding or reproducing the tools themselves does; write and ask.

What will not get a useful answer: requests for a quote, for a recommendation of a contractor, or for a professional opinion on whether a specific job is safe or compliant. Nest Quantum produces planning estimates and is not qualified to answer any of those.