Plumbing & Drainage
Estimate the stone quantity occupying the space between a measured dry-well excavation and a known chamber or structure displacement. The tool handles volume arithmetic only; infiltration capacity, storage sizing, setbacks, overflow and soil suitability remain project-design decisions.
Change the defaults to match your project and the product you plan to buy.
Project result
Review excavation envelope, entered chamber displacement, net stone volume and allowance-adjusted bulk volume.
At a glance
Planning estimate only. Verify product coverage, package size, supplier specifications and project requirements before purchasing.
Budget scenario
Use a current supplier subtotal or reuse a priced calculator result, then add optional delivery, tax and contingency. Home Measure Lab does not fetch or guess live prices.
Enter a current supplier subtotal or reuse a priced calculator result.
Budget values are local planning inputs, not live quotes. Verify tax treatment, delivery, labor and supplier pricing before purchasing.
Methodology
length × width × stone-filled depth
Uses the measured stone envelope.
excavation volume − entered chamber displacement
Displacement must be supplied from actual geometry/product data.
net stone space × (1 + placement allowance)
Does not represent hydraulic storage capacity.
stone target ÷ 27
Material volume only; not effective water-storage capacity.
Measure only the excavation zone intended to contain stone and separate any soil cover, topsoil or non-stone layers. Use the actual chamber, tank or structure displacement from geometry or manufacturer documentation. If the excavation is stepped or irregular, divide it into simpler volumes instead of forcing one rectangle. Keep inlet/outlet trenches separate unless they use the same stone section.
Aggregate type and gradation, geotextile, chamber configuration and compaction/placement method must come from the actual drainage design. This calculator does not determine whether a dry well is appropriate for the site or how large it should be. The result is a material-volume estimate after the project geometry is already known. Convert cubic yards to supplier weight only with a material-specific density.
Reference
| Layer | Record | Not decided here |
|---|---|---|
| Stone envelope | excavation dimensions | Required system size. |
| Displacement | actual chamber/structure volume | Product suitability. |
| Allowance | placement reserve | Hydraulic storage factor. |
| Bulk order | net stone target | Supplier density/weight conversion. |
Questions
No. Hydrologic sizing and infiltration design are outside the quantity calculator.
No. Enter the physical chamber displacement so the tool subtracts the space not occupied by stone.
No. Stone and chamber void space require separate hydraulic analysis.
Planning guides
Plumbing & Drainage
Separate the measured stone envelope from chamber displacement so aggregate quantity is not confused with hydraulic storage.
Read guide →Plumbing & Drainage
Add a visible stone placement reserve after chamber displacement, then convert net aggregate volume to the supplier unit.
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