Calculate decomposed-granite need from the finished compacted layer, then use the supplier's loose-to-compacted or density basis for ordering. Do not apply an undocumented universal compaction factor.
Start with finished compacted volume = area × specified compacted depth. Convert that requirement to loose delivery volume or tons only with the selected decomposed-granite supplier's compaction/density basis; do not assume a universal factor.
Published: September 28, 2026
Last reviewed: September 28, 2026
Published by BuildYard. The guide reflects BuildYard's calculation methodology and editorial standards and does not replace project-specific professional advice.
Finished volume = area × specified compacted depth.
Convert inches to feet before multiplying by square feet.
Delivered loose volume can exceed finished compacted volume.
Use the quarry or supplier's material-specific conversion where available.
Irregular edges, low spots, and grading corrections can add quantity beyond pure geometry.
Record these as explicit allowances.
Decomposed granite products differ in fines, color, stabilization, and recommended installation.
Use supplier instructions for the selected material and application.
Estimate river rock or decorative landscape stone from bed area, target depth, rock size, and supplier-specific bulk density or bag coverage.
Read guide →Gravel & StoneCalculate pea gravel volume and tons from area and depth, then convert to bulk or bagged procurement using verified product data.
Read guide →Gravel & StoneCompare crushed-stone and limestone base quantities using compacted volume, supplier density, gradation, and project specification rather than material name alone.
Read guide →Shows finished compacted geometry before supplier-specific loose-order conversion.
| Step | Calculation | Result |
|---|---|---|
| Depth | 2÷12 | 0.1667 ft |
| Compacted volume | 600×0.1667 | 100 cu ft |
| Cubic yards | 100÷27 | 3.70 yd³ |
| Loose order | Supplier compaction basis | Verify |
Current manufacturer data, supplier specifications, drawings, field measurements, applicable codes, permit requirements, and qualified professional guidance can take priority over a general-purpose planning estimate.