Brick and block calculator
Calculate how many bricks, concrete blocks or clay blocks to buy for a wall, minus doors and windows, with waste and mortar.
How many bricks to buy?
Available in: 
Brick and block calculator: what it is for
Enter the wall size and the area of doors and windows. Choose the type of brick or block and the calculator shows how many pieces go per m², the total with waste and an estimate of the laying mortar.
It has the most common sizes, like the 9 × 19 × 19 clay block, the 14 × 19 × 39 concrete block and solid brick, and accepts custom sizes.
How to use
- Type the wall and opening measurements.
- Choose the brick and the joint.
- See how many to buy.
When to use it
- Budget walls and fences.
- Compare clay and concrete blocks.
- Plan a renovation or addition.
Frequently asked questions
How many bricks go in 1 m²?
It depends on the size and the joint. With a 1 cm joint: a 9 × 19 × 19 clay block gives 25 per m², a 14 × 19 × 39 concrete block gives 12.5 per m² and a 5 × 10 × 20 solid brick laid flat gives about 45 per m².
How much waste should I allow?
5% to 10%, for breakage in transport and cutting.
Is it really free?
Yes, 100% free. No sign-up, no subscription and no usage limits. All Tools123 tools are free and run right in your browser.