Example 1
- 15 m² − 2 m² openings
- face 0.09 m² + 5% waste
152 bricks
This is a good starting point for a simple wall or partition when you want a quick sense of the material scale.
Brick calculator
Type wall area and the brick face including the joint. The calculator divides net area by the face, adds waste, and rounds up. A 15 m² wall minus 2 m² at 0.09 m² and 5% is 152 bricks. A 10 m² wall at 0.08 m² and 10% is 138. The 20 m² chart at 0.1 m² shows 210 / 220 / 230 at 5 / 10 / 15%.
Quick estimate: net area ÷ brick face, plus waste for cuts. Still need wall square footage? Wall area. Painting? Paint. Floors? Floor area.
Results
Wall area, Brick face area incl. joint, Waste (%) and Openings. The result shows up here.
How the results are calculated
Brick requirement counts pieces from area. The formula is ceil(((area minus openings) divided by face) times (1 plus waste)). Face is one brick plus joint in m².
A 15 m² wall minus 2 m² openings at a 0.09 m² face and 5% waste is 152 bricks. A 10 m² wall at 0.08 m² and 10% is 138. On 20 m² and a 0.1 m² face the chart shows 210, 220, and 230 at 5%, 10%, and 15% waste; the calculator at 10% stays on 220.
Type wall area and brick face including the joint. Waste, openings, and price are optional. Empty openings deduct nothing. A comma in 0.09 works like 0,09. Take 15 m² from wall area instead of guessing.
Wall area for a 4 by 3 by 2.6 m room is next door: 36.4 m². Paint for that wall lives on paint requirement. Floor area does not turn into bricks.
Five percent waste for cuts at openings is often enough on a straight wall; corners and many holes sit nearer 10%. 151.7 pieces is 152, because you buy whole bricks. Typing face 9 instead of 0.09 understates the count a hundred times.
Type 15, 0.09, 5%, and openings 2, click Calculate, and match 152. Then 20 and 0.1 at 10%: 220 bricks.
How to use this calculator
- Type wall area in m², for example 15, or 20 from a larger wall.
- Enter brick face including the joint in m², for example 0.09 or 0.1. That is one piece area, not side centimeters.
- Deduct openings and set waste, usually 5-10% for cuts.
- Click Calculate. 15 minus 2 at 0.09 and 5% is 152. 20 m² at 0.1 and 10% is 220.
- Wall square meters belong on wall area. This calculator stays brick count.
Bricks for a 15 m² wall
Net area divided by the face including the joint, plus waste. A 15 m² wall minus 2 m² at 0.09 m² and 5% is 152 bricks.
- m²
- Wall area. 15 − 2 = 13 m² net. At a 0.09 face and 5% that is 152 bricks. A 10 m² wall at 0.08 and 10% is 138.
- face
- One brick including the joint. 0.09 m² on 13 m² plus 5% is 152. The 20 m² chart at 0.1 m² shows 210 / 220.
Usage examples
Example 2
- 10 m² / 0.08 m²
- +10% waste
138 bricks
After adding reserve, the result reflects real purchasing more accurately because some bricks may be damaged, cut, or lost during the work.
Example 3
- 20 m² / 0.1 m²
- chart: 5/10/15% → 210/220/230
220 bricks (10%)
On a larger wall, even a small change in dimensions or reserve can noticeably increase the required brick count.
Related calculators
Frequently asked questions
How many bricks at 15 m² minus 2 m², face 0.09 m², and 5%?
152 pieces. Net area is 13 m², 13 / 0.09 × 1.05 rounds up because a fraction of a brick is not on the pallet.
How many bricks at 10 m², 0.08 m², and 10%?
138 pieces. That is the second card: 10 / 0.08 × 1.10, then ceil. A smaller face raises the count.
How many bricks for 20 m² at 0.1 m² and 10% waste?
220 bricks. The same 20 m² wall is 210 at 5% waste and 230 at 15%.
What waste should I add for bricks?
A straight wall often uses 5%. Corners and many openings sit nearer 10%. The 5 / 10 / 15% chart on 20 m² is 210 / 220 / 230.
Where do I get 15 m² of wall?
From wall area. A 4×3×2.6 m room is 36.4 m² with no openings.
Does brick format multiply the 152?
No, while the face stays 0.09 m². Type a new face for a different format.
How do I type a 25×12 cm brick with a joint?
Compute face in m², for example 0.27×0.13 = 0.0351, and type that number. The field does not take side centimeters.
Can I buy 151 when the result is 151.7?
Round up to 152. A fraction of a brick is not on the pallet.
Where is paint for this wall?
On paint requirement. 36.4 m² at 12 m²/L and two coats is another calculator.
How many bricks for 20 m² at 0.1 m² with no waste?
200 bricks. Ten percent waste adds 20 and gives 220 on the same face.
Knowledge sources
Volume and waste come from the sizes you type. Below are volume and NIST SI units.
Page updated in 2026.