Mortar is the bonding material between bricks, blocks, and stones. This calculator estimates how much mortar you'll need for your masonry project based on wall dimensions and brick type.
Standard bricks measure 8 inches long by 4 inches high, requiring about 7 bricks per square foot with standard 0.5-inch joints. Modular bricks are slightly smaller at 7.5x3.5 inches. Joint thickness affects both appearance and mortar quantity - thicker joints require more mortar but are easier for beginners.
Pre-mixed mortar comes in 80-pound bags that yield approximately 0.6 cubic feet when mixed. Type N mortar is best for general purpose use, while Type S provides higher strength for below-grade applications. Always mix only what you can use in 90 minutes.
For tuckpointing or repointing old mortar joints, you'll need much less material. The calculator assumes new construction. When repointing, estimate 1 bag per 50-75 square feet of wall depending on joint depth.
Quick Tips
- Always order 10-15% extra materials for waste
- Check local building codes before starting
- Measure twice, cut once — verify all inputs
Frequently Asked Questions
Type N for general use above grade, Type S for structural walls and below grade applications.
Standard is 0.5 inches (1/2 inch). Thinner joints (3/8 inch) look cleaner but are harder to achieve.
Initial set in 24-48 hours, full cure in 28 days. Keep newly laid brick damp for 3 days.
No, this weakens it. Mix fresh mortar instead. Mortar should be workable but not runny.
Add 10-15% extra for waste, spillage, and uneven joints.