Retaining Wall Materials for a 40' × 3' Wall
A 40-foot wall 3 ft high is 120 sq ft of face — about 180 standard 16×6" blocks plus caps and base gravel. Pick a different block size, a custom block, or poured/timber/stone above.
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Want the full guide — tools, step-by-step, common mistakes and FAQ? See the Retaining Wall Calculator.