How many tiles do I need for 100 square feet?

It depends on the tile: 100 sq ft of 12 × 12 inch tiles (1 sq ft each) is 100 tiles, 110 with 10% extra; of 12 × 24 inch tiles (2 sq ft) it is 50, so 55; of 6 × 6 inch tiles (0.25 sq ft) it is 400, so 440.

How much extra tile should I buy?

Daltile recommends about 10% more than the area needs, kept as attic stock so a broken tile can be replaced with one from the same batch. Diagonal patterns and rooms with many cuts need more.

How many tiles are in a square metre?

1 ÷ one tile's area in m². 60 × 60 cm tiles: 1 ÷ 0.36 = 2.8 a square metre. 30 × 30 cm: 11.1. 30 × 60 cm: 5.6. Then add the spare percentage.

Do I need to count grout lines?

No. Joints are a few millimetres wide, so leaving them out makes the count very slightly generous, which the spare tiles cover anyway.

How many tiles come in a box?

It varies with the tile and the maker; the box states the count and the area it covers. Divide the tile count from this page by the count per box and round up to whole boxes.

Tile Calculator: How Many Tiles Do I Need?

Tiles needed for a floor or wall from its area and the tile size, with spare tiles added.

Inputs

Room area(m²)

0.1 m²10,000 m²

Tile length(cm)

1 cm200 cm

Tile width(cm)

1 cm200 cm

Extra tile(%)

0 %50 %

Daltile recommends about 10% more than you need, kept as spares from the same batch.

Units

Include CalculateEveryday mark

Tiles needed

Working: 60 × 60 cm = 0.36 m² a tile; 12 m² ÷ 0.36 m² = 33.3 tiles, + 10% = 36.7 → 37
Tile area: 0.36 m²
Base count (no waste): 34
With waste: 36.7

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What each Tile input means

Room area: The area to tile, in m² or sq ft: length × width for a floor, width × height for each wall. Add the rectangles of an L-shaped room, and leave out anything you won't tile under.
Tile length: One tile's length, in centimetres or inches — the nominal size on the box, such as 60 or 24.
Tile width: One tile's width, in the same unit. A square tile has the same length and width.
Extra tile: Extra for cuts, breakage and spares. Daltile suggests about 10%; diagonal or herringbone layouts and small rooms with big tiles need 15% or more.
Units: Metric (metres, m², litres) or US units (feet, square feet, gallons). Change it at any point; the room area and tile sizes are converted for you.

Tile formula

tiles = (area ÷ one tile's area) × (1 + extra %), rounded up

n = \left\lceil \frac{A}{l \times w} \times \left(1 + \frac{p}{100}\right) \right\rceil

Work out one tile's face area — 60 × 60 cm is 0.36 m², a 12 × 24 inch tile is 2 sq ft — and divide the floor or wall area by it. That is the number of whole tiles the surface would take if nothing were ever cut or broken. Then add the extra: Daltile recommends buying about 10% more than you need, partly for cuts and breakage and partly as attic stock, so a cracked tile can be replaced later from the same batch (tiles from a later run can differ in shade). Round up, and round up again to whole boxes. Grout joints are a few millimetres and are ignored; they make the count very slightly generous.

Tile worked example

A 12 m² floor in 60 × 60 cm tiles: each tile is 0.36 m², so 12 ÷ 0.36 = 33.3 tiles to cover it. Add Daltile's 10%: 33.3 × 1.1 = 36.7, so 37 tiles. In US units, a 10 × 13 ft bathroom floor (130 sq ft) in 12 × 24 inch tiles (2 sq ft each) is 65 tiles, 72 with 10% extra.

More Tile examples

A 130 sq ft bathroom floor in 12 × 24 inch tiles: each is 2 sq ft, so 65 cover the floor, and 10% extra makes 71.5 — round up to 72 tiles.

A 6 m² shower wall in 30 × 60 cm tiles with 15% for the many cuts around the tray and the niche: 6 ÷ 0.18 = 33.3 tiles, plus 15% is 38.3, so 39.

Where the Tile calculator can give the wrong answer

Diagonal and herringbone layouts cut far more tiles than straight lay. Raise the extra percentage rather than trusting 10%.
Measure each rectangle of an L-shaped room separately and add the areas; subtract cabinets, a bath or a shower tray you are not tiling under.
Tiles are sold by the box. Divide the tile count by the box quantity and round up, and buy every box from the same batch.
Large tiles waste more per cut: a cut 60 cm tile loses more than a cut 30 cm one, so small rooms in big tiles can need well over 10%.

Spotted a mistake? Tell us

Tile reference table

Tiles per square metre and per 100 square feet, before extra
Tile size	Tiles per m²	Tile size (US)	Tiles per 100 sq ft
20 × 20 cm	25	6 × 6 in	400
30 × 30 cm	11.1	12 × 12 in	100
30 × 60 cm	5.6	12 × 24 in	50
45 × 45 cm	4.9	18 × 18 in	44.4
60 × 60 cm	2.8	24 × 24 in	25
60 × 120 cm	1.4	24 × 48 in	12.5

Source: Arithmetic: 1 m² ÷ one tile's area, and 100 sq ft ÷ one tile's area (144 sq in to the square foot)

Tile FAQ

: It depends on the tile: 100 sq ft of 12 × 12 inch tiles (1 sq ft each) is 100 tiles, 110 with 10% extra; of 12 × 24 inch tiles (2 sq ft) it is 50, so 55; of 6 × 6 inch tiles (0.25 sq ft) it is 400, so 440.
: Daltile recommends about 10% more than the area needs, kept as attic stock so a broken tile can be replaced with one from the same batch. Diagonal patterns and rooms with many cuts need more.
: 1 ÷ one tile's area in m². 60 × 60 cm tiles: 1 ÷ 0.36 = 2.8 a square metre. 30 × 30 cm: 11.1. 30 × 60 cm: 5.6. Then add the spare percentage.
: No. Joints are a few millimetres wide, so leaving them out makes the count very slightly generous, which the spare tiles cover anyway.
: It varies with the tile and the maker; the box states the count and the area it covers. Divide the tile count from this page by the count per box and round up to whole boxes.