Concrete Block (CMU) Calculator
Concrete masonry unit (CMU) walls: calculates the number of blocks and the mortar, and additionally gives the **grout / core-fill concrete** quantity — the item that most distinguishes blockwork from brickwork.
Disclaimer：Results are produced by deterministic formulas and are intended for quantity estimating and option comparison only. A qualified engineer must verify them against the project specification, design documents and actual site conditions before use. The author accepts no liability for any loss arising from their use.
ASSUMPTIONS
RESULT
CALCULATION
METHOD
Blocks are counted as for brickwork; wall volume
V = A × Wblock; core fill Vg = V × void ratio × grouted percentage.- The void ratio varies widely between block types; 0.40–0.50 is typical, but take the value from the manufacturer data.
- Core fill must be self-compacting or fine-aggregate concrete placed and compacted in lifts; its wastage is measured separately.
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