Mortar quantity is more reliable when tied to the selected mortar product and masonry unit rather than a generic volume factor. Establish the brick or block count first, then use manufacturer coverage for that unit and bag size.
Complete the brick or block count first, then divide masonry-unit quantity by the selected packaged mortar's published approximate units-per-bag coverage. Adjust for actual joint and field conditions, then round up to whole bags.
Published: September 18, 2026
Last reviewed: September 18, 2026
Published by BuildYard. The guide reflects BuildYard's calculation methodology and editorial standards and does not replace project-specific professional advice.
Complete the brick or CMU takeoff before estimating packaged mortar.
Keep different unit sizes and joint profiles separate when their mortar demand differs.
Packaged mortar data can state approximate units laid per bag for standard brick or block.
Keep the assumption visible so it can be replaced when project or product data is available.
Joint thickness, tooling, waste, block geometry, filling, and workmanship can change actual consumption.
Treat published coverage as an estimating basis rather than a guaranteed yield on every wall.
Apply any justified allowance before rounding the total to complete bags.
Do not round each small wall independently if material will be shared across the project.
Mortar type and suitability are specification decisions, not quantity outputs.
Verify the required mortar system for the masonry application before purchasing.
BuildYard example uses QUIKRETE's published approximate coverage of 37 standard bricks per 80 lb bag before a field allowance.
| Step | Result |
|---|---|
| Standard bricks | 740 |
| Published coverage | 37 bricks / 80 lb bag |
| Net mortar bags | 20 bags |
| With 10% field allowance | 22 bags |
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Read guide →Current manufacturer data, supplier specifications, drawings, field measurements, applicable codes, permit requirements, and qualified professional guidance can take priority over a general-purpose planning estimate.