How many bricks do I need per square meter?

A standard brick (single course, 10 mm joints) typically needs about 50 bricks per m². Concrete blocks (e.g., 200×400 mm) need about 13 per m². Always add 5% for waste and breakage.

How much mortar do I need for a brick wall?

A rough estimate for standard brickwork is 0.3 bags of cement (25 kg) and 1 bag of sand (30 kg) per m² with a 1:4 mix. This varies by brick size and joint thickness.

What is the difference between a brick and a concrete block?

Standard bricks are smaller (typically 215×102×65 mm) and are used for both structural and decorative walls. Concrete blocks (e.g., 400×200×200 mm) are larger, faster to lay and commonly used for structural walls where appearance is less critical.

How do I calculate the number of bricks for a wall?

Multiply wall length × height to get the area in m². Multiply by bricks per m² for your brick size (typically 50 for standard bricks). Add 5% for waste and cuts.

Brick Wall Calculator

Calculate the number of bricks or concrete blocks, cement bags and sand required for a masonry wall.

What this calculates

Calculates wall area, number of bricks or blocks (with waste), cement bags and sand bags for the mortar.

Formula used

Area = length × height. Units = area × bricks/m² × (1 + waste). Cement and sand are estimated from the wall area using standard ratios for a 1:4 mortar mix.

Worked example

A wall of 5 m × 2.5 m = 12.5 m². Standard brick at 50/m² + 5% waste = 657 bricks. Cement: 4 bags of 25 kg. Sand: 13 bags of 30 kg.

Bricks per m² reference

Standard brick (215×102×65 mm, 10 mm joint): ~50/m² per course. Concrete block (400×200×200 mm): ~13/m². Double-brick walls: multiply by 2. Always confirm with your specific brick dimensions.

When not to use this calculator

Structural walls, retaining walls, arched openings and walls with complex bonding patterns require engineering design. This calculator gives quantities for simple single-leaf walls.

How to use this calculator

Enter the wall length and height in meters (or switch to feet with the imperial toggle).
Select the type of masonry unit — standard brick, concrete block (CMU) or face brick.
Set the waste factor — 5% for bricks (cutting and breakage), 3% for concrete blocks.
Click "Calculate" to see unit count, mortar bags and sand quantity. Optionally enter a unit price for a cost estimate.

Masonry units worldwide — dimensions and coverage

Brick dimensions vary significantly by country, which directly affects how many bricks you need per m²:

US standard brick (92×57×203 mm, 10 mm joint): ~45 bricks/m² (single wythe).
UK standard brick (65×102×215 mm, 10 mm joint): ~60 bricks/m² (half-brick wall).
Australian standard brick (76×110×230 mm): ~37 bricks/m².
Chilean ladrillo corriente (70×140×290 mm): ~25–30 ladrillo/m² (single leaf).
Concrete block / CMU (200×200×400 mm): ~13 units/m².

This calculator defaults to a common international standard. Enter the coverage from your supplier's data if your brick size differs.

Structural limits — when engineering is required

Unreinforced masonry has specific height and length limits before engineering becomes mandatory. General guidelines (always check local code):

Free-standing garden walls: maximum 1.5–1.8 m without engineering in most jurisdictions.
Load-bearing walls (supporting roof or floor): require an engineer's design for mix proportions, mortar class, wall ties and movement joints.
Retaining walls over 1.2 m: require engineering due to lateral earth pressure loads.
Seismic zones: unreinforced masonry has strict restrictions — consult local building code before proceeding.

Frequently asked questions

How many bricks do I need per m²?

About 50 for standard bricks with 10 mm joints. About 13 for concrete blocks (400×200 mm face). Add 5% for waste.

How much mortar for a brick wall?

Approximately 0.3 bags of cement (25 kg) and 1 bag of sand (30 kg) per m² for a 1:4 mix and standard brick. This varies by brick size and joint thickness.

Standard brick vs concrete block?

Bricks are smaller (215×102×65 mm), slower to lay, often used for face/decorative walls. Concrete blocks are larger, faster to lay, used for structural walls where appearance is less critical.

How do I calculate bricks for a wall?

Area (m²) × bricks per m² × (1 + waste%) = total bricks needed. Round up.

Assumptions

Standard brick: ~50 units/m² (single leaf, 10 mm joints).
Concrete block: ~13 units/m² (400×200 mm face, 10 mm joints).
Mortar: based on 1:4 cement:sand ratio.
Does not include lintels, reinforcement, wall ties or DPC.
Single-leaf wall only — double for cavity walls.

Technical warning

Load-bearing walls, walls with openings, retaining walls and foundation walls require engineering design. Confirm brick density and mortar specifications with your engineer.

Common mistakes

Not accounting for openings (doors, windows) — measure and deduct them from total wall area.
Using the wrong brick count per m² for your specific brick size.
Forgetting to include mortar materials in the budget.

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