A 45x45 cm tile covers 0.2025 m², so you need about 4.94 tiles per square metre. A 12 m² room takes 60 tiles, or 66 with 10% waste.
45x45 Tile Calculator
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About 45x45 Tile Calculator
A 45 by 45 centimetre tile covers 0.2025 square metres, which is 4.94 tiles per square metre. A 4 by 3 metre room of 12 square metres needs 60 tiles before waste and 66 with a 10 percent allowance. This page opens with the tile size already set, so you only enter the room. Forty five centimetres is close to the American 18 inch tile, which is why it is common in kitchens and living areas on both sides of the Atlantic. Check the actual size printed on the box rather than the name: tiles sold as 45x45 are sometimes 44.7 or 45.7 centimetres, and over a long room that difference adds up to a noticeably different number of rows. Enter the real dimensions in the calculator if they differ. The other figure on the box worth using is the coverage per box in square metres, since tiles are sold by the box and the number per box varies between manufacturers. Divide the area including waste by that coverage and round up to whole boxes. For a slightly smaller format see 40x40 Tile Calculator, and for a larger one 60x60 Tile Calculator.
How to use 45x45 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 45x45 tiles per square metre?
About 4.94, since each tile covers 0.2025 square metres. Multiply your area by 4.94 and round up, then add waste.
How many 45x45 tiles for a 20 square metre room?
About 99 before waste and 109 with a 10 percent allowance. Rooms with a kitchen island or several doorways need more.
Is a 45x45 tile the same as an 18x18 inch tile?
Nearly. Eighteen inches is 45.7 centimetres, so the two are often sold interchangeably, but the small difference adds up over a large floor. Use the size printed on the box.
How many 45x45 tiles are in a box?
It varies by manufacturer and thickness, so read the box. Most list the coverage in square metres, which is the more useful figure for ordering.
Should I order extra boxes?
Yes, at least one beyond the calculated amount with waste. It covers breakages and gives you spares for future repairs from the same batch, since shades vary between production runs.