Disclaimer

Last updated 9 November 2026.

Estimates for planning

The calculators give estimates to help you plan a purchase. Real materials vary: stone and soil weigh more when wet, one quarry's gravel differs from the next, and ground is rarely as flat or square as the numbers assume. Confirm weights, bag yields and coverage with your supplier, and add a margin for waste, before you order.

Nothing on the site is engineering advice. For footings, retaining walls, drainage channels and anything a building code covers, follow your local code and a qualified engineer or contractor.

Prices and sources

Prices are typical figures from online store listings, public bid tabulations and price indexes, dated on each page. They will differ where you buy. Each page names its sources, so you can check the figures yourself.

Affiliate links

Some pages list the tools a job needs, and those links go to Amazon. As an Amazon Associate I earn from qualifying purchases. We choose the tools ourselves, for what the job calls for, and buying through a link costs you nothing extra. No one pays to be listed, and the calculators, prices and sources are never affected by these links.

More on how the site works is in the terms of use and the privacy policy.