Brick Calculator
About the Brick Calculator
Estimate how many bricks you need for a wall from its length, height, and the brick size you are using, with an allowance for mortar joints and wastage. Built for homeowners planning a boundary wall as well as contractors preparing a quote.
This tool works in your browser: the files and text you use are processed on your device and are not uploaded.
How to use it
- Enter the wall length and height to get the wall area.
- Select or enter your brick dimensions (standard sizes are pre-filled).
- Add a wastage allowance — 5–10% covers breakage and cuts on most jobs.
Frequently asked questions
How many bricks are needed per square metre?
With a standard metric brick (215 × 102.5 × 65 mm) and 10 mm mortar joints, a single-skin (half-brick) wall needs about 60 bricks/m². A double-skin (one-brick) wall needs about 120/m². South Asian standard bricks (9" × 4.5" × 3") come out near 50 bricks/m² for a 4.5-inch wall.
How much extra should I order for wastage?
Add 5% for simple straight walls and 10% or more for walls with many openings, corners, or cut bricks. Ordering everything in one batch also keeps the colour consistent between firing lots.
How much mortar do I need?
Roughly 0.02–0.03 m³ of mortar per m² of single-skin wall — about one 50 kg bag of cement per 100–120 bricks at a 1:5 cement-to-sand mix. Openings (doors and windows) should be subtracted from the wall area first.