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Construction Calculators

Concrete Block Calculator

Calculate how many standard concrete blocks (CMUs) are needed to build a wall from its length and height.

ft
ft
Standard 8x16in block with mortar joints averages about 1.125 blocks per square foot.
%
Wall area —
Blocks needed —
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About the Concrete Block Calculator

This calculator estimates the number of standard concrete masonry units (CMUs) needed to build a block wall. Standard blocks measure 8in × 16in on the face, and once mortar joints are factored in, roughly 1.125 blocks cover each square foot of wall.

Formula: Wall Area = Length × Height; Blocks Needed = Wall Area × Blocks per Sq Ft × (1 + Waste %)

Add 5-10% extra for cutting, breakage and corner blocks. This estimate doesn't subtract openings for doors or windows, so subtract those areas first for a tighter estimate.

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