Disclaimer

Gravel Calculator results are estimates for planning an order. Check your measurements and your supplier's figures before you buy stone.

Weights and volumes

The calculator uses one planning weight per stone, taken from published agency figures where they exist. Real loads vary with the quarry's rock, the grading and how wet the stone is, so a ticket can differ from the estimate. If your quarry quotes its own weight per yard or per cubic meter, use it.

Depths, codes and structures

Depth and layer guidance comes from codes, highway guides and makers' instructions. It is not engineering advice. Slabs, retaining walls, drainage near foundations and anything that carries a building need your local building department's rules, and sometimes an engineer.

No affiliation

No transportation department, code body, government office, quarry or maker mentioned in the guides runs, funds or endorses Gravel Calculator. They are named only so you can see where a figure started.

External links

A link out points to the agency or maker document behind a figure. Those documents are revised by their owners, and Gravel Calculator has no control over what they say later.