Block Wall Calculator

CMU (concrete masonry unit) count for a wall.

BLOCKS NEEDED
blocks
CMU count

Usage Tip

Standard CMU block is 8 x 8 x 16 inches. Add extra for cuts and broken blocks when ordering.

THE MATH
Blocks = Area × 144 ÷ (BL × BH) × 1.05
Where: BL × BH = nominal block face (in)
• Includes 5% for cuts and breakage
• Standard CMU is 8 x 8 x 16 inches
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The calculators and tools on Formula Factory are provided for general guidance and informational purposes only. Results are estimates based on standard formulas and the values you enter — they do not constitute professional engineering, electrical, or architectural advice. Always verify calculations with a qualified professional before making decisions for any safety-critical, code-compliance, or commercial application. Formula Factory makes no representations or warranties as to the accuracy or completeness of any result, and accepts no liability for errors, omissions, or any outcomes arising from reliance on this information.