Brick calculator: bricks, mortar bags and veneer ties

Add the joint to each face dimension, multiply, and divide into 144: bricks per sq ft = 144 ÷ ((length + joint) × (height + joint)). For a modular brick, 7⅝ × 2¼ inches with a ⅜ joint, that is 144 ÷ (8 × 2.625) = 6.86.

The Brick Industry Association publishes 6.75 for modular brick because modular coursing is laid three courses to 8 inches — a slightly fatter bed joint than a strict ⅜. Either is defensible; the difference on a 1,000 sq ft wall is about 110 bricks, less than the waste allowance.

Worked example: a 30 × 8 ft wall with 30 sq ft of windows is 210 sq ft net. 210 × 6.86 = 1,440 bricks, plus 5% waste = 1,512. At about 37 per bag that is 41 bags of mortar, and a veneer wall needs 79 ties.

Net of waste. Sizes are the specified face dimensions; check the manufacturer’s sheet for your unit.

The mortar count starts from the typical 37 modular bricks per 80-lb premixed bag and scales by joint area: a bigger brick has more joint per unit, so fewer bricks per bag. It is a planning number — the bag’s coverage chart and your crew’s actual use beat it.

For veneer over framing, the IRC limits each tie to 2.67 square feet of wall. Confirm spacing and any wind or seismic requirements in the code edition your jurisdiction has adopted.

Backup walls in block come from the concrete block calculator. To price labor per thousand brick alongside material, use masonry estimating software or send these quantities to the free estimate builder — and see how to estimate a construction job for the rest of the bid.