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Estimate paint, tile, flooring and wallpaper quantities from a room's length, width and height, with door/window deductions and a waste allowance. Everything stays in your browser.
Enter the room dimensions in metres or feet.
Choose what you are covering and subtract doors and windows.
Combined area of doors and windows (subtracted from the wall surface).
Pick the material and set its coverage, coats and waste.
Typical emulsion paint covers 10-12 m² per litre per coat.
Net area and how much to buy, rounded up to full units.
Estimates use standard coverage rates. Confirm with the coverage printed on the product and let a professional verify the final list.
This is a planning estimate only. Real quantities depend on the product's actual coverage, wall condition, pattern matching and the installer's method.
All calculations run locally in your browser. No data is uploaded.
Estimating renovation materials by eye usually ends in either three extra paint buckets in storage or a mid-project trip to the store. This free renovation calculator turns a room's length, width and height into concrete purchase lists: litres of emulsion paint for walls and ceiling, tile pieces for floors and walls, flooring packs, and wallpaper rolls. It subtracts doors and windows, applies a standard waste allowance, and rounds everything up to full buckets, boxes and rolls so you can buy once with confidence. All calculations run locally in your browser with no signup and no uploads.
A renovation calculator is a free tool that estimates how much paint, tile, flooring or wallpaper you need for a room from its length, width and height, deducting doors and windows and adding waste, so a typical 4 m by 5 m bedroom needs about 5 buckets of 5-litre paint for two coats.
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How much paint do I need for a 4m x 5m room?
A 4 m by 5 m room with 2.8 m walls, one door and one window has about 67 m2 of paintable surface. At the typical coverage of 10 m2 per litre, two coats need about 13 litres of emulsion paint, so buy 3 buckets of 5 litres (15 litres in total) to cover cuts and waste.
How many 600 x 600 mm tiles per square metre?
One 600 x 600 mm tile covers 0.36 m2, so you need about 2.78 tiles per square metre; for a 10 m2 floor add 10% waste and buy about 31 tiles.
How much extra material should I add for waste?
Add about 10% for wall and floor tiles, 5% to 8% for flooring planks, and 10% to 15% for wallpaper so cuts and breakage do not leave you short.
How much wallpaper do I need per wall area?
A standard roll covers about 5.3 m2 (0.53 m by 10 m); for 46 m2 of paintable wall area after door and window deductions you need about 10 rolls with a 10% waste allowance.
Is this calculator accurate enough to order materials?
The tool gives a reliable planning quantity using standard coverage rates, but always confirm with the paint, tile or flooring coverage printed on the product and let a contractor check the final list.