Retaining Wall Materials for a 30' × 3' Wall
A 30-foot wall 3 ft high is 90 sq ft of face — about 135 standard blocks plus caps and base gravel. Switch the material above for poured concrete, timber, or natural stone.
You'll need
135 blocks
Wall face area
90 sq ft30' long × 3' high
Wall blocks
135Concrete block — standard (≈16×6" face)
Cap blocks
30~12" cap units
Gravel base / backfill
1.5 tons6"-deep leveling base + drainage backfill
Block cost (est.)
$675~$5/block material
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