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Retaining Wall Calculator - Calculate materials for retaining wall construction
Calculate materials for retaining wall construction
Formulas and edge cases are reviewed against authoritative references before publication. For methodology, editorial standards, or corrections, use the links below.
Frequently asked questions
Do I need a permit?
Walls over 4 feet typically require permits and possibly engineering. Check local codes.
Why use setback blocks?
Setback creates a slight lean into the hillside, using soil weight to stabilize the wall.
Is drainage necessary?
Absolutely. Water pressure behind the wall is the main cause of failure. Use gravel and drain pipe.
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About this tool
This Retaining Wall Calculator turns your inputs into practical results. Provide Wall Height, Wall Length, and Block Size to calculate Blocks Needed and Cap Blocks Needed.
Adjust values to compare scenarios and see how sensitive the result is. The calculation uses the numbers as entered, so double-check units and expect small differences from rounding in the displayed totals.