Retaining Wall Block Calculator
Calculate retaining wall blocks (4x12, 6x16, 8x18), buried base courses, cap blocks, and drainage gravel backfill.
Input Parameters
Enter dimensions and specifications to estimate materials.
Total Wall Blocks Needed
Wall Courses
10 courses (1 buried)
Blocks per Course
30
Cap Stones
32caps
Drainage Gravel (3/4")
3.3cu yds
Material estimates include recommended trade waste buffer. Always confirm dimensions on site prior to ordering.
How The Calculation Works
Formulas, material coverage assumptions, waste buffers, and rounding standards.
Wall height is divided by block height to calculate the number of courses.
At least one base course must be buried beneath grade for shear stability.
Computes drainage gravel volume behind the wall (1-foot gravel chimney) to prevent hydrostatic pressure buildup.
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Frequently Asked Questions
Practical installation guidance and purchasing tips for retaining wall block calculator.