Construction · Calculator
Block Calculator
Calculate the number of concrete blocks needed for a wall.
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Block Calculator
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Estimate concrete blocks (CMU) required for your wall project.
Formula
Blocks = (Wall Area / Block Area) × 1.05Step-by-step
- Compute wall area in sq inches
- Compute block area with mortar joint
- Divide and add 5% waste
Example
30×10 ft wall with standard 16×8 blocks = ~213 blocks.
FAQ
What is a standard CMU size?+
A standard concrete block is 16 × 8 inches (nominal).
Why add 5% extra?+
To account for cuts and breakage during installation.
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