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Contact

Found a mistake or have a suggestion? We would like to hear from you.

Email us

What to write to us about

A mistake in a calculation, a table or a guide.
A suggestion for a calculator, a material or a project type we do not cover yet.
A problem using the site on your phone or browser. Please tell us which device and browser you use.
A privacy request, as described in our privacy policy.

What we cannot help with

We are not a supplier or a contractor, so we cannot give quotes, sell gravel or recommend a contractor for your project. For quantities specific to your site, ask your local supplier, who knows the material they sell.

We read every message, but we may not be able to reply to all of them.