Retaining Wall Calculator
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Formula
Blocks = (Length ÷ Block Width) × (Height ÷ Block Height). Base Gravel = Length × 2' × 0.5'. Drainage = Length × 1' × Height.
Frequently Asked Questions
How deep should the base be for a retaining wall?
Dig a trench about 6 inches deep and twice the width of the blocks. Fill with compacted gravel for a stable base.
Do I need drainage behind a retaining wall?
Yes. Place drainage gravel and a perforated drain pipe behind the wall to prevent water pressure buildup.