Retaining-wall takeoff is not just wall area divided by block face area. Count whole units by course, separate cap units, and calculate base and drainage aggregate from their actual cross-sections.
Count retaining-wall units course by course, calculate caps separately by linear coverage, and estimate base/drainage aggregate from each specified cross-section. Curves, corners, steps, embedment, and reinforcement must follow the selected wall system.
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.
Courses = exposed wall height ÷ installed block course height, rounded according to the selected system.
Stepped grades require course-by-course geometry rather than one average height.
Units per course depend on wall length, block length, corners, curves, and manufacturer pattern rules.
Caps are a separate linear takeoff and may have different dimensions.
Aggregate volume = length × width × compacted depth for each specified zone.
Keep compacted requirement separate from supplier conversion and delivery allowance.
Unit type, setback, reinforcement, drainage, embedment, and maximum wall geometry come from the selected system and project design.
Quantity arithmetic does not design a retaining wall.
Brick Calculator estimates brick, pallets, and mortar allowance for general brick walls with openings.
Open calculator →FoundationsFoundation Calculator estimates concrete for foundation wall or footing runs for early continuous-foundation material planning.
Open calculator →Estimate crawl-space footing, wall, pier, vapor-retarder, and excavation quantities by separating each foundation component.
Read guide →MasonryEstimate concrete masonry units from net wall area, nominal module, openings, special units, and a project-specific waste allowance.
Read guide →Cement & MasonryEstimate face brick and fire brick separately from wall or lining geometry, actual unit size, joint module, openings, cuts, and project-specific waste.
Read guide →Illustrative unit takeoff using 18-in-long wall units and 12-in cap coverage; verify the selected system's actual dimensions and design.
| Step | Calculation | Result |
|---|---|---|
| Wall units/course | 30÷1.5 | 20 |
| 3 courses | 20×3 | 60 units |
| Caps | 30÷1 | 30 caps |
| Base/drainage | L×W×D | Separate volume |
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.