Retaining Wall Calculator

Calculate the number of blocks and capstones needed for a retaining wall.

Wall Dimensions

Wall Length (ft) (ft)

Wall Height (ft) (ft)

Block Dimensions

Block Length (in) (in)

Block Height (in) (in)

Material List

Building a Wall?

Enter dimensions to find the exact block count.

Overview

This calculator estimates the materials for a segmental retaining wall. It determines the number of standard blocks for the main body and capstones for the top row based on your project dimensions.

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Pro Tips

Burry the first course of blocks (about 1 inch of depth for every 8 inches of wall height) for stability.
Capstones are typically wider and flatter than standard wall blocks and are glued in place.
Always order 5-10% extra blocks to account for breaking and cutting.

Fun Facts

"Retaining walls taller than 3-4 feet usually require engineering and permits."
"Most retaining wall blocks have a lip on the bottom back edge to lock them into the course below."
"Proper drainage behind the wall (gravel and drain pipe) is essential to prevent failure from hydrostatic pressure."

Formula: Blocks = Wall Area / Block Face Area

Used with this

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