QUESTIONS & FEEDBACK
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Have a question about the website, noticed a calculator problem, or found an article that needs correcting? We welcome useful feedback about our material-planning tools and guides.
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Report a Calculator Problem
If a calculator gives an unexpected result, share the calculator name, inputs, selected units (feet, inches, cubic yards or US tons), expected result if known, and the result displayed. Note whether your figures describe loose or compacted material and any density or allowance assumptions.
For example: “The drain rock estimate changes when I switch from inches to feet, even though I entered equivalent measurements.” Avoid sending your home address or other personal project details.
Suggest a Correction
Found an incorrect formula, outdated source, broken link, unclear material explanation, typo, accessibility barrier or other website problem? Include the page title or URL, what appears to be wrong, and a reliable source when available. Suggestions are reviewed as resources permit; not every change can be adopted.