Construction
Retaining Wall Block Calculator
Calculate wall blocks, cap blocks, and cost for a segmental retaining wall.
Inputs
Live estimate
Wall blocks needed
126
- Rows
- 6
- Blocks per row
- 20
- Cap blocks
- 20
- Material cost
- $750
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How it's calculated
Rows = ceil(wall height × 12 ÷ block height in inches).
Blocks per row = ceil(wall length × 12 ÷ block length in inches).
Wall blocks = ceil(rows × blocks per row × (1 + waste %)).
Cap blocks = blocks per row (when enabled).
Material assumptions
- Common block: 12 in long × 6 in tall × 8 in deep.
- First course goes on 6 in of compacted base and 1 in of bedding sand.
- Backfill with drain rock behind the wall and wrap in filter fabric.
Frequently asked questions
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Related calculators
Retaining walls over 3–4 ft usually require engineering, drainage design, permits, and geogrid reinforcement.