Contact

The fastest way to reach us is email: [email protected].

What we most want to hear

• Formula corrections. If a calculator's number doesn't match a product's stated coverage, tell us the product, the page and the figure you expected. Verified corrections are published.
• Manufacturer coverage data. If you publish coverage or yield data for a material we calculate, we would rather use your tested numbers than industry averages.
• Calculator requests. If a project quantity has ever sent you to the store twice, tell us which one — the request list drives what we build next.

We read everything and reply to correction reports first. Please don't send project measurements expecting a personal estimate — the calculators on the site will give you the same numbers we would, instantly.