An 80x80 cm tile covers 0.64 m², so you need about 1.56 tiles per square metre. A 12 m² room takes 19 tiles, or 21 with 10% waste.
80x80 Tile Calculator
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About 80x80 Tile Calculator
An 80 by 80 centimetre tile covers 0.64 square metres, so a square metre needs 1.56 tiles. A 4 by 3 metre room of 12 square metres needs 19 tiles before waste and 21 with a 10 percent allowance. The size is preset on this page so you only enter the floor. At 80 centimetres you are firmly in large format territory, and the installation rules change. The floor has to be genuinely flat, not just level, because a rigid tile this size cannot follow a dip and will rock or show raised corners. Self levelling compound and a tile levelling clip system are normally needed. Adhesive coverage matters too: large tiles should be back buttered as well as laid on a notched bed, so there are no hollow spots that crack under a point load. A typical 10 millimetre porcelain tile of this size weighs around 14 to 15 kilograms, which is manageable for one person but awkward to place accurately. Waste is lumpier than with small tiles. An offcut from an 80 centimetre tile is often too large to throw away and too small to fit anywhere, so plan cuts so that pieces from one side of the room can finish the other. For a slightly smaller format see 60x60 Tile Calculator, and for larger ones 100x100 Tile Calculator.
How to use 80x80 Tile Calculator
Choose metric or imperial, then enter the floor, wall or shower dimensions
Enter tile length and width in centimetres or inches
See tile count and optional box count in metric and imperial
Frequently Asked Questions
How many 80x80 tiles per square metre?
About 1.56, since each tile covers 0.64 square metres. Multiply your area by 1.56, round up, and add the waste allowance.
How many 80x80 tiles for a 20 square metre room?
About 32 before waste and 35 with a 10 percent allowance. With so few tiles, one or two breakages make a real difference, so do not cut the allowance.
Do 80x80 tiles need a levelling system?
In practice yes. A tile this size cannot flex to follow small variations in the floor, so levelling compound and clips are used to keep the edges flush.
Should I back butter large tiles?
Yes. Spreading a thin coat of adhesive on the back of the tile as well as the floor gives full coverage. Hollow spots under a large tile are where cracks start.
How heavy is an 80x80 tile?
Around 14 to 15 kilograms for a typical 10 millimetre porcelain tile. Thicker outdoor tiles weigh more, so check the specification before carrying them upstairs.