Pro calculator
Mortar Calculator
Estimate bags of mortar for brick and block projects.
How the mortar calculator works
Mortar coverage depends on the unit. Rule of thumb: one 70 lb bag of pre-mix type S covers about 125 modular bricks or 30 standard CMU blocks.
Frequently asked questions
How much mortar do I need per block?
About 3/4 to 1 lb of mixed mortar per CMU face-shell joint — plan on 1 bag per 30 blocks.
What is type S mortar?
A medium-strength mortar (~1800 psi) suitable for load-bearing walls, brick, block and stone above and below grade.
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