Concrete Block Calculator
Estimate concrete masonry blocks, mortar allowance and block purchase cost for a rectangular wall.
Concrete Block Calculator
Estimate the number of concrete masonry units (CMUs) needed for a rectangular wall.
Wall dimensions
Your estimate
Calculation details
Nominal module sizes include typical mortar joints. This is a block quantity estimate, not structural or mortar design.
Net wall area = length × height − openings. Blocks = net area ÷ nominal face module area, rounded up. Nominal dimensions include the intended mortar joint. Confirm block and joint dimensions with your supplier.
Concrete block FAQs
Does this calculate mortar bags?
No. Mortar consumption depends on block type, wall thickness, joint dimensions and workmanship.
Can this design a load-bearing wall?
No. Structural walls require appropriate engineering and local code review.
How MaterialMetrik works
Enter project dimensions in your preferred unit system.
Choose realistic allowances, yields, densities and supplier prices.
See transparent quantities, whole packaging units and costs.
Frequently asked questions
Are prices live supplier prices?
No. All prices are entered by you; the tool does not fetch local prices or currency exchange rates.
Does changing units change the project size?
No. Existing dimensions are converted to equivalent values when switching between imperial and metric.
Are these engineering calculations?
No. These are preliminary material quantity estimates. Structural design, foundations and local code compliance require appropriate professional review.
Can I share an estimate?
Yes. The share button creates a URL containing the calculator's input values. It does not upload your project data.