Building materials calculators
Work out exactly how much you need for the job — then tap through to find the merchants near you, closest first. Free, no signup.
Brick calculator — how many bricks per m²?
A single-skin wall needs ~60 bricks/m², a double-skin ~120. Enter your wall area:
Concrete block calculator
Standard 440×215mm blocks work out at ~10 per m² of wall.
Concrete calculator — how much concrete do I need?
Enter your slab or footing dimensions for the volume plus bag estimates.
Paint calculator — how much paint do I need?
Based on surface area, number of coats and coverage per litre.
Plasterboard calculator
Sheets needed for a wall or ceiling area (standard board is 2.4m × 1.2m).
Tile calculator
Tiles needed for a floor or wall, including a cutting allowance.
Decking calculator
Boards needed for your deck, accounting for the gap between boards.
All results are estimates with a wastage allowance built in — always double-check quantities before ordering, especially for footings and structural work.