Brick and block calculator
Bricks or blocks needed for a single-leaf wall.
Fill in the fields and the result will appear here automatically.
This calculator works out how many bricks or blocks cover a wall built as a single leaf. Every unit owns one joint to its right and one above it, so the working module is the unit size plus the joint thickness on each side. The area of openings is subtracted from the wall area, and the waste allowance is reported on its own line so you can see exactly how many units it costs.
How it works
Formula and logic
This counts one masonry leaf over the visible wall face. Area = length × height or an entered area, minus total opening area. One unit module is (unit length + joint) × (unit height + joint)/1,000,000 m²: add a joint once in each direction. Counts without and with reserve are separately rounded up from their respective areas/module area. Reserve, unit dimensions and joint thickness are user inputs; no universal joint thickness is selected. If openings occupy the entire wall, an explanatory no-masonry message appears. Price is per unit in RUB. Wall thickness, bonding, multiple leaves, lintels, mortar and strength are not modeled. This estimates element count and is not a structural design.
Example
A 6 by 2.8 m wall with no openings, built from 250 by 65 mm bricks with a 10 mm joint, gives a module of 0.26 by 0.075 = 0.0195 m², so 16.8 m² needs 862 bricks, or 905 with a 5% allowance.
Fields and units
- Mode — By dimensions / By area
- Wall length — m
- Wall height — m
- Known area — m²
- Total opening area — m²
- Unit length — mm
- Unit height — mm
- Joint thickness — mm
- Reserve — %. Chosen non-negative percentage; no universal rate is prescribed. Blank means 0.
- Price per unit — RUB. Price in RUB; no currency exchange. Blank or 0 hides cost.
How to use
- — Describe the wall by its dimensions, or enter its area directly if you already know it.
- — Enter the total area of window and door openings — it is subtracted from the masonry area.
- — Enter the length and height of the unit in millimetres and the mortar joint thickness.
- — Add a waste allowance for breakage and cutting, and a price per unit if you need the cost.
Method and limitations
- Calculation method
- Formula and logic
- Limitation
- Wall thickness, bonding, multiple leaves, lintels, mortar and strength are not modeled. This estimates element count and is not a structural design.
FAQ
Is the mortar joint taken into account?
Yes. Every unit owns one joint to its right and one above it; the neighbouring joint already belongs to the next unit. So the joint thickness is added once to the length and once to the height, not twice. With a 10 mm joint a 250 by 65 mm brick occupies 260 by 75 mm in the wall.
What wall thickness does this cover?
A single leaf, measured on the visible face of the wall. Walls one brick thick, one and a half bricks, cavity walls and walls with a separate facing leaf need bonding geometry rather than just an area, and are not modelled here. For a multi-leaf wall, calculate each leaf separately.
Why is the number rounded up?
You cannot buy part of a brick, and one unit fewer will not cover the whole area. When the area divides into the module exactly, no extra unit is added: the rounding is protected against binary noise and will not turn an exact number into that number plus one.
How much waste should I allow for breakage and cutting?
Choose brick waste allowance from cuts around openings, expected breakage and spare units. The model increases the unrounded requirement for one wall leaf and then rounds to whole pieces. The separate reserve row shows added pieces; geometry does not establish a universal percentage.
How do I handle openings?
Add up the areas of all windows and doors and enter the total in the openings field. It is subtracted from the wall area. If the openings fill the whole wall, no calculation is produced — there is nothing to build.
Does it work for aerated and foam blocks?
The same geometry applies to rectangular blocks, but use actual unit sizes and joint thickness from the project and product instructions. A 2–3 mm joint is a possible example, not a universal requirement.
Does it include mortar consumption?
No. The calculator counts units, not mortar volume: that depends on the wall thickness and the bonding pattern, neither of which is modelled here. Work the mortar out separately from your drawings.