Tile Calculator
Find out how many tiles to buy for a floor or wall. Enter the area size and your tile size, add a waste allowance for cuts and breakage, and see the number of tiles — and boxes — you need, calculated instantly in your browser with nothing uploaded.
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Enter the area size and tile size to estimate tiles.
How to estimate tiles for a room
The calculator works the way a tiler would. It finds the area you're covering, divides it by the size of one tile, adds a margin for the tiles you'll cut or break, and rounds up to whole tiles and whole boxes.
Area to cover. Multiply the length by the width. A 12 × 10 floor is 120 square feet. For a wall, use its width and height instead. For an L-shaped space, split it into rectangles, add up the areas, and enter the total.
Tile size. Enter the tile's nominal size from the box — 12 × 12 inches, 24 × 12 inches, 30 × 30 centimetres, and so on. The calculator converts that to the area one tile covers.
Waste allowance. Around 10% covers the off-cuts at edges and the odd cracked tile, and leaves a few spares for future repairs. Bump it to 15% for diagonal or herringbone layouts, fiddly rooms, or large-format tiles.
Everything runs in your browser — the numbers you type are never uploaded.
Tile calculator questions
How many tiles do I need? Divide the area you're covering by the area of one tile, add about 10% for waste, and round up. This page does it all as you type and can also work out the number of boxes.
How much waste should I add? Roughly 10% for a standard straight layout, 15% for diagonal or herringbone patterns, rooms with many cuts, or large-format tiles. The default is 10%.
How do I measure for tiles? Measure length and width (or wall width and height) and multiply for the area. Break odd shapes into rectangles and add the areas together.
Should the tile size include the grout gap? No — use the size printed on the box. The narrow grout joint is effectively absorbed by the waste allowance.
Why round up to whole boxes? Because tiles are sold by the box. Enter how many tiles a box holds and the calculator rounds the total up to the next full box, so you have enough to finish with a little spare.
This is a planning estimate. Keep a few spare tiles after the job for repairs, since dye lots can change between batches.