Example: Wall length: 40 ft · Wall height: 3 ft · Block face: 12×4 in → Wall blocks: 378.
Cap blocks: 40
Gravel backfill (12 in): 4.4 cu yd
Frequently asked questions
How do I calculate retaining wall? Enter your numbers above and the result updates instantly. For example: Wall length: 40 ft · Wall height: 3 ft · Block face: 12×4 in → Wall blocks: 378.
Is this Retaining Wall Calculator free? Yes — completely free with no sign-up or paywall. It runs entirely in your browser and keeps working offline; the numbers you enter never leave your device.
How accurate is it? It uses the standard published formula for retaining wall. Results are estimates for planning — not financial, tax, medical, engineering, or legal advice.