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Utilities

Brick Calculator

Enter your wall size and brick type to estimate bricks, mortar, cement and sand — including bond patterns.

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How the Brick Calculator Works

The count starts from the wall face: bricks per square metre = 1 ÷ ((brick length + joint) × (brick height + joint)). A standard UK clay brick (215 × 102.5 × 65 mm) with 10 mm joints works out at about 60 bricks per m² for a single skin; a double skin needs twice as many. Net wall area is length × height minus doors and windows, and 10% extra covers cutting and breakage.

Bond patterns decide how the wall is built. Stretcher bond lays bricks lengthwise and makes a half-brick (single skin) wall — the usual choice for garden and partition walls. English bond and Flemish bond alternate stretchers and headers to make a full one-brick wall: English bond alternates whole courses, Flemish bond alternates within each course for a decorative face. Both one-brick bonds use roughly double the bricks of a stretcher wall.

Clay brick sizes vary by country: UK standard 215 × 102.5 × 65 mm, US modular about 194 × 92 × 57 mm, and Indian modular 190 × 90 × 90 mm. Mortar, cement and sand figures here are estimates — mortar is roughly 0.3 m³ per 1,000 UK bricks before waste — so confirm large orders with your supplier.

Frequently Asked Questions

How many bricks do I need per square metre?
About 60 UK standard bricks per m² for a single-skin wall with 10 mm joints, or 120 for a double skin. Other brick sizes differ: the calculator works it out from the brick dimensions you pick.
How much waste should I add?
10% suits most straight walls; allow 15% for walls with many corners, arches, or openings that need cutting.
What is the difference between English and Flemish bond?
Both are one-brick bonds. English bond alternates entire courses of stretchers and headers, while Flemish bond alternates stretchers and headers within every course, giving a more decorative pattern.
Do I subtract doors and windows?
Yes — enter their total area and the calculator removes it from the wall area first, so you only buy bricks for the solid part of the wall.

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