Free Retaining Wall Calculator. Enter wall dimensions to calculate the number of blocks, cubic yards of fill, and total estimated cost for your retaining wall project.
🧱 Retaining Wall Calculator
💡 Pro Tip
Proper drainage is the most critical factor in retaining wall longevity. Install a perforated drain pipe behind the wall and use 3/4-inch gravel backfill to prevent hydrostatic pressure buildup.
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Frequently Asked Questions
Q: How do I calculate blocks for a retaining wall?
Divide the total wall area (length × height) by the face area of one block. Add 10% for waste and cuts at corners.
Q: How high can a retaining wall be without engineering?
In most areas, retaining walls under 3–4 feet high can be built without an engineer's approval. Taller walls may require permits and professional engineering drawings.
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