Brick Calculator — South Africa
Calculate bricks, mortar, cement and sand for any SA wall. Covers maxi, face and stock bricks — single and double skin.
Quick answer: For a single-skin wall, maxi bricks (290×140×90mm) require approximately 45 bricks per m², while standard stock or face bricks (222×106×73mm) require approximately 55 bricks per m². Double-skin walls need double these figures. Always add 5–10% for wastage, cutting and breakage when ordering.
⚠️ For planning purposes only. Consult a registered contractor or quantity surveyor before ordering materials.
How to Use This Calculator
Enter your wall length and height in metres — the calculator computes the gross wall area automatically. Then enter the combined area of any doors and windows to deduct from the gross figure. If there are no openings, leave that field at zero.
Select your brick type (maxi or stock/face), wall type (single or double skin), and a wastage factor. Use 10% for most projects and 15% for complex layouts with many openings. Results include total bricks, cement bags, and sand volume based on a standard 1:4 mortar mix.
SA Brick Sizes — What You Need to Know
Getting your brick quantity right before ordering is one of the most important steps in any building project. Order too few and you risk a batch mismatch from the next delivery — bricks fired in different batches often vary slightly in colour and tone, which is visible on face brick or unpainted work. Order too many and you are paying for material that sits on site. This calculator gives you an accurate starting point based on actual SA brick sizes and a standard 10mm mortar joint.
| Brick Type | Dimensions (L×W×H) | Single Skin per m² | Double Skin per m² | Best Use |
|---|---|---|---|---|
| Maxi Brick | 290×140×90mm | ~45 bricks | ~90 bricks | Load-bearing walls, boundary walls, faster laying |
| Stock Brick | 222×106×73mm | ~55 bricks | ~110 bricks | General construction, plastered walls |
| Face Brick | 222×106×73mm | ~55 bricks | ~110 bricks | Exposed decorative brickwork, no plaster needed |
Coverage rates assume a 10mm mortar joint — the SA standard. Rates include mortar joints both horizontally (bed joints) and vertically (perpend joints).
The Brick Calculation Formula
Net Wall Area (m²) = (Length × Height) − Opening Area
Bricks (no waste) = Net Area × Bricks per m² × Skin multiplier
Bricks (with waste) = Bricks (no waste) × Wastage factor
Mortar volume (m³) = Net Area × Joint volume constant
Cement bags (50kg) = Mortar volume ÷ (mix ratio + 1) ÷ 0.033
Sand (m³) = Cement bags × mix ratio × 0.033
Mortar Quantities for SA Brickwork
Mortar is one of the most underestimated costs in brickwork. Many first-time builders calculate bricks accurately but forget to budget properly for cement and sand. The standard mortar mix for general brickwork in South Africa is 1 part cement to 4 parts building sand (1:4 by volume). For every 1,000 standard stock bricks you should budget approximately:
- 3–4 bags of 50kg cement (using 1:4 mix)
- 0.45–0.55 m³ of building sand (approximately 1 bulk bag)
- Important: Use building sand (coarse, angular) not plaster sand (fine, rounded) — plaster sand produces weak mortar
Single Skin vs Double Skin Walls
A single-skin wall is one brick wide — for maxi bricks this is 140mm thick, for stock bricks it is 106mm thick. Single skin is used for internal partition walls, garden walls, and boundary walls where structural load is limited. A double-skin wall (also called a cavity wall or solid double-brick wall) is two bricks wide and is used for external walls of habitable rooms in most SA construction, providing better thermal and sound insulation. Double-skin walls use exactly twice the bricks and mortar of a single-skin wall of the same face area.
For habitable rooms, SANS 10400 generally requires walls that meet minimum thermal performance standards. In most South African climates, a double-skin brick wall with appropriate cavity treatment satisfies this requirement. Always confirm the wall specification with your architect or building inspector before ordering materials.
Why Brick Prices Vary Across SA Provinces
Brick prices in South Africa vary significantly by province, primarily because of transport costs from manufacturing centres. The Gauteng region has the highest concentration of brick manufacturers and generally the most competitive pricing. KwaZulu-Natal and the Western Cape tend to be 10–20% more expensive due to transport. Always get quotes from at least two local suppliers and confirm whether the price is ex-works (you collect) or delivered to site.
The type of brick also affects price significantly. Stock bricks and maxi bricks are the most affordable and widely available. Face bricks — which require no plastering and are suitable for exposed architectural use — are considerably more expensive, often two to three times the price of a standard stock brick. If you are using face brick for aesthetic reasons, factor this premium into your budget early.
When budgeting for a large brickwork project, also account for wastage. A 5% wastage factor is standard for straightforward rectangular walls; complex shapes, arches, window surrounds and corners typically require 8–10%. Cutting bricks on-site generates waste beyond the bare area calculation. Always round up to the nearest full pallet when placing your order, as returning part-pallets is rarely possible with most SA brick suppliers.
Want the full build budget, not just brick quantities? Read the Build Cost Planning Guide →