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The calculators and guides on this site are provided free, as estimates only. Coverage, weight and bag sizes vary by supplier, moisture and how well material is compacted, and project conditions differ. Always confirm quantities, depths and any local requirements with your supplier or a qualified professional before you order or build. We are not liable for the quantities you buy.

We may change or remove content at any time. Links to other sites, including affiliate links, are provided for convenience and we are not responsible for third-party content, prices or availability.

Last updated 7 November 2026.