Brick calculator
Brick counts come from the area a brick plus its mortar joint occupies, not from the brick alone.
%
Bricks needed
1494
- Bricks per square metre
- 59.3
- Wall area
- 24.00
- Number of courses
- 32
- Mortar volume
- 0.480
- Sand needed
- 960
- Cement bags at 1:4
- 9.6
Show the working
- Wall length = 10
- Wall height = 2.4
- Brick length = 215
- Brick height = 65
- Mortar joint = 10
- Number of leaves = 1
- Waste allowance = 5
- Wall area = 10 * 2.4 = 24
- brick_area = (215 + 10)/1000 * (65 + 10)/1000 = 0.016 875
- Bricks per square metre = 0.016 875 > 0 ? 1 / 0.016 875 : 0 = 59.2593
- Bricks needed = ceil(24 * 59.2593 * 1 * (1 + 5/100)) = 1494
- Mortar volume = 24 * 1 * 0.02 = 0.48
- Sand needed = 0.48 * 1.25 * 1600 = 960
- Cement bags at 1:4 = 960 / 4 / 25 = 9.6
- Number of courses = floor(2.4 * 1000 / (65 + 10)) = 32
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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The formula
- bricks per square metre = 1 / ((brick length + joint) x (brick height + joint))
- a standard UK brick at 215 x 65 mm with a 10 mm joint gives 60 per square metre per leaf
Mortar volume is taken as about 0.02 m3 per square metre of single-leaf wall, which suits a 10 mm joint.