Retaining Wall Calculator

Size a retaining wall before you order materials. Enter the wall length, height, and block dimensions to get the block count and base gravel volume.

ft
ft
in
in
in
in

🚀 Course math

Blocks per course = wall length ÷ block length, rounded up.

🔋 Drainage

Walls over 2 ft should add a gravel backfill and drain pipe.

🔎 5% waste

Adds a standard breakage allowance to the order.

🔒 Private

All calculations run locally in your browser.

More landscaping tools

Walls that hold their ground.

Stone Calculator → Gravel Rip Rap

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