Brick Calculator
Work out how many bricks or concrete blocks you need for a wall, including openings and waste.
For a single-skin (half-brick) wall. Double the count for a solid one-brick-thick wall, and buy all bricks from the same batch so the colour matches.
About this tool
Enter the wall length and height, subtract windows and doors, and choose your brick or block size. The calculator adds the mortar joint to each brick, works out how many fit in each square metre or square foot, and adds a waste allowance so you order enough.
Frequently asked questions
About 60 UK standard bricks (215 × 65 mm face) per m² of single-skin wall with 10 mm mortar joints, because each brick plus mortar covers 225 × 75 mm. Australian 230 × 76 mm bricks work out at about 48.5 per m².
US modular bricks (7⅝ × 2¼ in) laid with ⅜ in joints cover 8 × 2⅝ in each, so you need about 6.86 per ft². Queen bricks (7⅝ × 2¾ in) need about 5.76 per ft².
Around 5% covers cuts and breakages on a simple wall; allow 10% for walls with many corners, openings or cut bricks. Buying a few spare from the same batch also helps with later repairs.
Standard 440 × 215 mm blocks with 10 mm joints cover 450 × 225 mm each, which is about 10 blocks per m². US 8 × 16 in CMUs (15⅝ × 7⅝ in actual) need 1.125 blocks per ft².
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