Brick Calculator
Estimate how many bricks a wall needs, with a wastage allowance.
Single-skin estimate including mortar joints. Double walls roughly double the count; mortar is a separate calculation.
Counting bricks by area
Each brick covers its face area plus the mortar joint around it. Divide the wall area by that effective brick size and you have the number of bricks for a single-skin wall.
bricks = area ÷ ((length + joint) × (height + joint)) × (1 + wastage)
Entering the brick size with the joint included keeps the estimate honest. A standard format works out to roughly sixty bricks per square metre, but the calculator adapts to whatever size you give it.
A 10 m² single-skin wall with bricks 22.5 × 7.5 cm including mortar (about 59 bricks per m²) needs roughly 593 bricks bare, or about 652 with 10% added for cuts and breakages.
Ordering with confidence
Bricks are bought in packs and run as one batch for colour consistency, so it pays to order enough — including wastage — in a single go. A small surplus also leaves matching bricks for future repairs.
On-site notes
- Include the joint. Mortar is part of each brick’s footprint.
- Double for two leaves. Cavity walls need roughly twice the count.
- Match the batch. Ordering together keeps the colour even.