About this brick calculator
With 3/8 in mortar joints, a modular brick (7⅝ × 2¼ in) covers 1/6.86 of a square foot, so a wall needs about 6.86 bricks per sq ft. A 20 × 8 ft wall is 160 sq ft: 1,097 bricks, 1,152 with 5% waste. Plan roughly 7 bags of mortar mix per 1,000 bricks.