Mortar Calculator
Estimate bags of mortar for brick and block projects.
Mortar is estimated per unit laid: about 1 standard 80 lb bag of mortar mix per 30–35 bricks, or per 12–15 concrete blocks, laying 3/8 inch joints. One cubic foot of mortar sets roughly 30 bricks. Count your units, divide by that yield and add 10% for waste. Enter your wall details for bags of mortar and sand.
How does the mortar calculator work?
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.
Which guide explains this in more depth?
- How inspectors check brick and mortar counts on a single-wythe wall. Read the inspector-approved brick calculator method guide for the full worked example.
What else do people ask about this calculator?
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.
Which related calculators should I use next?
Where can I learn more about these materials?
Weights, coverage, types and buying tips for the materials this calculator estimates.
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