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Landscaping

Landscaping Rock Coverage Calculator

How far a ton of decorative rock goes, and how much a bed needs.

Your numbers

ft
ft
sq ft
%
Extra for cuts, breakage and offcuts.
$

Result

Tons needed 4
Area 240.0 Square feet
Area including waste 259.2
Estimated material cost $380
For 240.0 sq ft plus 8% waste you need 4 tons, costing about $380.

Coverage depends on stone size and depth. Smaller stone covers more ground per ton than larger, and at two inches deep a ton of 3/4 inch rock covers roughly 80 to 100 square feet. Coverage figures on a bag or a box are laboratory numbers measured on a flat, prepared surface. Real surfaces are rougher, more absorbent and more awkward than that, so the honest allowance is always higher than the label suggests.

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Questions

About this calculator

How deep should decorative rock be?

Two inches over fabric for most beds. Three or more if it is a path being walked on, because thin rock migrates.

Does stone size change coverage?

Considerably. Larger stone has bigger voids, so a ton of 2 inch rock covers noticeably less area than a ton of pea gravel at the same depth.

The formula

tons = area / coverage per ton

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Estimating is the easy part

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