Mortar Calculator
Calculate how many bags of mortar or Type S masonry mortar you need for brick, block, or stone work. Get exact bag counts for walls, patios, and retaining walls based on area and joint size.
Formula & Reference
| Variable | Formula | Units |
|---|---|---|
| Mortar Calculator | Bags = Wall Area / Coverage per Bag | bags |
Step-by-Step Examples
160 sq ft brick wall, 3/8-inch joints, Type S.
- Bags (60 lb) = 160/30 = 5.33 -> 6 bags
- Or 80-lb bags: 160/35 = 4.57 -> 5 bags
- Type S is the standard exterior mortar for most brick work
240 sq ft CMU wall, Type S.
- 60-lb bags: 240/30 = 8 bags
- 80-lb bags: 240/35 = 6.86 -> 7 bags
50 sq ft stone wall, wider joints (0.75 in).
- Stone uses more mortar due to irregular shapes and wider joints
- Estimate 50% more mortar than for brick: ~10 bags (60-lb)
- Actual qty varies greatly by stone type and joint width
Real-World Applications
Common Mistakes to Avoid
Type S (Portland + masonry cement) for exterior and below-grade work. Type N for interior. Type M for foundations and driveways. Never use interior mortar outdoors - it will fail.
Tuck-pointing existing joints requires more mortar than new work because you're grinding out and refilling existing joints. Add 25-50% extra for repointing projects.
Mortar consistency should resemble peanut butter - it should hold a thumbprint but not slump. Too wet = weak joints. Too dry = poor bonding.