Mortar & Grout Calculator — ft, bags, cost
How to use this calculator
Choose a mode: mortar for brick walls, mortar for block walls, grout for CMU fill, or custom volume entry. Enter wall dimensions and the calculator estimates bags of mortar or grout needed, total volume, and weight.
Mortar Types — Type M (2 500 psi, below-grade), Type S (1 800 psi, structural), Type N (750 psi, general), Type O (350 psi, interior).
Bag Sizes — 60 lb and 80 lb pre-mixed mortar bags.
Waste — 10–15% typical for mortar, 5–10% for grout.
Saved Calculations
| Time | Mode | Area ft² | Vol ft³ | Bags | Weight lbs | Cost |
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How to Calculate Mortar and Grout
This calculator estimates mortar and grout quantities for masonry construction. Choose from four modes: mortar for brick walls (accounts for brick size and joint thickness), mortar for CMU block walls, grout for block cell fill, or direct volume entry. Mortar types per ASTM C270 include Type M (below-grade), S (structural), N (general), and O (interior).
Mortar Coverage
Standard brick with ½″ joints uses approximately 7 bags (80 lb) of mortar per 100 ft² of wall. CMU 8×8×16″ block walls use approximately 3–4 bags per 100 ft². Grout fill for 8″ CMU requires approximately 0.5 ft³ per block when all cells are filled.
Bag Coverage
80 lb bag ≈ 0.5 ft³ mixed. 60 lb bag ≈ 0.38 ft³ mixed. Coverage varies by manufacturer — check bag labels for exact yield.
