Last updated: 2026-09-26
Estimates only
The calculators give estimates based on your inputs and on general published densities. Real quantities depend on the actual material, moisture, compaction, site conditions and measuring accuracy. Confirm quantities, densities and prices with your supplier before ordering.
No professional advice
Nothing on this site is engineering, construction, legal or financial advice. For structural, drainage-critical or commercial work, consult a qualified professional.
No warranty
The site is provided “as is”, without warranties of any kind. To the extent permitted by law, we are not liable for losses arising from use of the calculators or content, including over- or under-ordering.
Use of the site
You may use the calculators freely for personal and commercial planning. Please don't copy the site's content wholesale or interfere with its operation.
External links
We link to external sources for reference. We are not responsible for their content.