Calculate mortar bags for brick or concrete block from total masonry units, estimated units per bag and waste allowance. Adjust the coverage to your product.
Enter your measurements and material details.
Joint width, block type, workmanship and bag size all affect the number of units one bag can lay.
Mortar coverage is best entered as a units-per-bag rate for the exact masonry unit and mortar package. The calculator divides total units by that rate, adds waste and rounds to full bags.
First estimate brick or block quantity. Then find a realistic coverage rate for your mortar package and joint dimensions. The default is only a planning value and should be replaced when product guidance is available.
The number varies by block size, joint dimensions and bag size; enter the rate you expect.
Yes if you use a brick-specific units-per-bag coverage.
A modest allowance accounts for dropped mortar and variability.
No. Masonry grout and setting mortar serve different purposes.
No. It estimates packaged mortar bags.
Using the example inputs shown in the calculator — Masonry units = 500, Units per bag = 35, Extra allowance (%) = 10 — the result is 16 bags. This demonstrates the formula with a complete set of numbers rather than a hidden assumption.
The result breakdown also shows Masonry units: 500; Coverage rate: 35 units/bag. Replace the example values with field measurements and the exact product coverage, yield or package size you plan to buy.
For this mortar calculator, the inputs with the greatest practical effect are masonry units, units per bag and extra allowance. Recalculate when any of those change; do not reuse a result from a different room, run, layer depth or product specification.
Mortar Calculator is intended to help with quantity planning and arithmetic. It does not inspect the site, choose structural dimensions, determine code compliance or replace manufacturer installation instructions. Conditions such as slope, substrate quality, moisture, soil, framing, access and workmanship can change the final amount required.
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