How many tiles do I need for a room?

Work out the floor or wall area, divide by the face area of one tile, then round up and add a margin for cuts. A 120 sq ft floor tiled in 12×12 inch tiles is 120 ÷ 1 = 120 tiles before waste; with a 10% margin you are buying about 132. In metric, 11 m² in 300 × 300 mm tiles is 11 ÷ 0.09 ≈ 122 tiles before waste, 135 with 10%. This tool does that division and rounds the boxes for you once you enter the room and the tile size.

How much extra should I buy for waste and breakage?

Ten percent is the usual starting point for a straight lay and it is the default here. A diagonal or herringbone layout wastes more off the cuts, so lift it to 15%. It is worth buying a spare box from the same batch anyway — dye lots shift, and matching a cracked tile two years later is close to impossible.

Should I subtract cabinets, islands or fixtures?

For a rough order you can leave the room whole and let the waste margin soak up the covered areas. If you are tiling an expensive stone and want a tight count, measure the true tiled area — floor minus the island footprint, wall minus the window — and enter that instead. This tool tiles exactly the area you give it.

How do I count tiles for a wall instead of a floor?

The same way — a wall is just a vertical area. Enter the wall length as one dimension and the height as the other, set the tile size, and read the count. For several walls, total their area first on the square footage calculator and bring that number back here.

Tile calculator

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This is a straight division of the area you type by the tile you pick, with a margin added for offcuts. It cannot see your layout, your pattern or the fiddly corners of the room, so treat the box count as a buying figure and lay a dry run before you commit the last box.

Enter the room size and the tile size, tell it how many tiles come in a box, and the tool totals the area, divides by one tile's face, adds waste and rounds up to whole boxes. That box figure is what you carry to the till.

Exemple détaillé

A 12 ft × 10 ft floor is 120 square feet. In 12 × 12 inch tiles each tile covers one square foot, so that is 120 tiles before waste. Add 10% and you need 132 tiles; at 10 tiles a box that rounds to 14 boxes. Move to 18-inch tiles and each covers 2.25 sq ft, dropping the count to about 59.

In metric: a 3.6 m × 3 m floor is 10.8 m². A 300 × 300 mm tile covers 0.09 m², so that is 120 tiles before waste; add 10% for 132 tiles, which at 10 a box is 14 boxes.

Sur le chantier

A bathroom floor in 12 × 24s. The floor tapes 8 ft × 6 ft = 48 ft² and the tile is 12 × 24 in, which is 2 ft² a piece: 24 tiles. With 10% that is 26.4 → 27 tiles, and in boxes of 8 you are buying 4 boxes, 32 tiles. Five spares — keep them. The vanity is staying, so its 3 × 2 footprint could come off, but on a floor this small the three tiles it saves are the same three you want in the basement when one cracks. In metric the same job is a 2.4 × 1.8 m floor, 4.32 m², in 300 × 600 mm tiles at 0.18 m² each: 24 tiles, 27 with 10%.

Shower walls in subway tile, sold by the square foot. Three walls to 7 ft: 3 ft, 5 ft and 3 ft wide, so (3 + 5 + 3) × 7 = 77 ft². Subway boxes are usually labelled by coverage, not count — say 5 ft² a box. Then 77 × 1.1 ÷ 5 = 16.9 → 17 boxes. If you want the tile count to plan the layout, a 3 × 6 is 0.125 ft²: 77 ÷ 0.125 = 616 tiles before waste, so put 1 in the tiles-per-box field and read the tile count straight.

A backsplash full of outlets. 18 ft of counter × 18 in high is 27 ft². In 4 × 4s (0.111 ft²) that is 243 tiles; but every outlet and the window stool is a cut, and the cuts are where the breakage is. Fifteen percent here, not ten: 243 × 1.15 = 280 tiles. (In metric: 5.5 m × 450 mm is 2.475 m²; in 100 × 100 mm tiles that is about 248, and 285 with 15%.)

What went wrong?

Quick referencefor tile

Tile face, in ft²: 12 × 12 = 1 · 12 × 24 = 2 · 18 × 18 = 2,25 · 24 × 24 = 4 · 6 × 6 = 0,25 · 3 × 6 = 0,125 · 4 × 4 = 0,111
Tiles per square foot: 144 ÷ (width × height in inches)
Tiles per 100 ft², straight lay, 10% waste: 12 × 12: 110 · 12 × 24: 55 · 18 × 18: 49
Tiles per 10 m², straight lay, 10% waste: 300 × 300: 123 · 300 × 600: 62 · 600 × 600: 31
Perte: straight 10% · diagonal or herringbone 15% · lots of cuts and outlets 15–20%
Metric faces: 30 × 30 cm = 0.09 m² (11.1 per m²) · 60 × 60 = 0.36 m² · 30 × 60 = 0.18 m²
Square feet in a square metre: 10,76

Waste & overagewhat to add, and why

Tile setters buy 10% over for a straight lay and 15% for a diagonal, herringbone or any pattern with lots of cuts — and up to 20% on large-format tile where one broken piece is a big piece. The waste field starts at 10%.
Keep a box for repairs from the same dye lot; a replacement box a year later will not match.
Boxes are the unit of purchase: the buy line rounds to whole boxes, so check the tiles-per-box figure on the label.

Mistakes to catchbefore you order

Typing the tile size in inches when the tool is set to metric — a 12 in tile is 30.5 cm, so typing 12 cm comes out about six and a half times too many.
Subtracting the island or the vanity to the inch on a small floor; the cuts around them waste more than the area saved, so most setters leave them in.
Measuring the wall for a backsplash but forgetting the return behind the range.

La formule

tiles = (area × (1 + waste)) ÷ (tile width × tile height)

Bring the tile size into the same unit as the area — inches become feet by dividing by twelve — so a 12-inch tile is a one-foot square; in metric, millimetres become metres by dividing by 1,000, so a 300 mm tile is 0.3 m and 0.09 m². Divide the room area by that face area for the raw tile count, lift it by the waste margin, then round the boxes up because you cannot buy part of one.

Questions

How many tiles do I need for a room?: Work out the floor or wall area, divide by the face area of one tile, then round up and add a margin for cuts. A 120 sq ft floor tiled in 12×12 inch tiles is 120 ÷ 1 = 120 tiles before waste; with a 10% margin you are buying about 132. In metric, 11 m² in 300 × 300 mm tiles is 11 ÷ 0.09 ≈ 122 tiles before waste, 135 with 10%. This tool does that division and rounds the boxes for you once you enter the room and the tile size.
How much extra should I buy for waste and breakage?: Ten percent is the usual starting point for a straight lay and it is the default here. A diagonal or herringbone layout wastes more off the cuts, so lift it to 15%. It is worth buying a spare box from the same batch anyway — dye lots shift, and matching a cracked tile two years later is close to impossible.
Should I subtract cabinets, islands or fixtures?: For a rough order you can leave the room whole and let the waste margin soak up the covered areas. If you are tiling an expensive stone and want a tight count, measure the true tiled area — floor minus the island footprint, wall minus the window — and enter that instead. This tool tiles exactly the area you give it.
How do I count tiles for a wall instead of a floor?: The same way — a wall is just a vertical area. Enter the wall length as one dimension and the height as the other, set the tile size, and read the count. For several walls, total their area first on the square footage calculator and bring that number back here.

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