Retaining Wall Calculator
Calculate materials needed for your retaining wall
Wall Specifications
Walls over 4' may require engineering
Important Notes
• Excavate and compact base
• Use 6" gravel base
• Install drainage behind wall
• Check local codes for walls over 4'
Materials Needed
Wall Coverage
80 sq ft
Standard Block
240
Cap Blocks
20 blocks
Base Gravel
1.04 tons
0.74 cubic yards
Backfill Gravel (drainage)
4.15 tons
2.96 cubic yards
Drain Pipe (4")
20 feet
Estimated Total Cost
$1075.56
Materials only, labor not included
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: Standard Mathematical References
by Various
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.