Construction · drainage
Retaining-wall drainage stone quantity.
Estimate stone for the behind-wall drainage zone and the base layer, with a supplier density, waste allowance, and a breakdown you can print or copy.
Wall and stone zones
Stone estimate
Method and limits
Source / method · 2026-09-29: local rectangular-prism volume formulas only; no prices, live catalog data, or external service is used. Density comes from your quarry or supplier specification.
Limitations: This is a material quantity estimate, not a retaining-wall, footing, drain-pipe, filter-fabric, reinforcement, slope, groundwater, or code design. Confirm the drainage detail with the project professional and local authority where required.