ToolnozaCONSTRUCTION TOOL
Concrete Block Calculator
Estimate concrete blocks for a wall from net area, nominal block dimensions and a waste allowance. Includes an optional block purchase cost.
Concrete Block Calculator
FREE ONLINE TOOLSTEP BY STEP
How to use concrete block calculator
- Review the calculated output and assumptions.
- Compare with the example and the stated limits.
IN PRACTICE
Example
A 10 × 2 m wall minus 2 m² of openings is 18 m². With 40 × 20 cm nominal blocks and 5% waste: 237 blocks.
GOOD TO KNOW
What does this tool include and exclude?
Count = ceil(net wall area / nominal face area × (1 + waste / 100)). An area estimate, not a course layout or structural design. Corner blocks, lintels, mortar, grout, reinforcement and labor are excluded.