Retaining Wall Materials for a 20' × 2' Wall
A 20-foot wall 2 ft high is 40 sq ft of face — about 60 standard blocks plus caps and base gravel. Switch the material above for poured concrete, timber, or natural stone.
You'll need
60 blocks
Wall face area
40 sq ft20' long × 2' high
Wall blocks
60Concrete block — standard (≈16×6" face)
Cap blocks
20~12" cap units
Gravel base / backfill
1.0 tons6"-deep leveling base + drainage backfill
Block cost (est.)
$300~$5/block material
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Want the full guide — tools, step-by-step, common mistakes and FAQ? See the Retaining Wall Calculator.