Retaining Wall Blocks Calculator
Count blocks for a retaining wall face, with a waste allowance.
Quick answer: enter your details below and click Count Blocks — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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Enter your details below.
How to use
- Measure the wall length and height in metres.
- Enter the face area of one block.
- Click Count Blocks.
About this tool
Enter the wall length and height and the face area of one block, and the tool works out the face area, divides by block face area, adds a 10 percent allowance for cuts and breakage, and rounds up. The allowance is shown separately.
Frequently asked questions
Do tall walls need engineering?
Walls above about a metre often need professional design and local approval, so check rules before building.
What about cap blocks?
Cap blocks are counted separately by wall length, not by face area.
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