handyfig
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How Many Tiles for 100 Square Feet?

100 square feet takes 100 tiles of 12 x 12 inches, or 110 with 10% for waste. The tile size changes the count a lot.

Try your own numbers

Area lengthArea widthThe floor or wallGrout jointTile lengthTile widthClose-up
Key The area to cover, and one tile with its grout joint.
Units
Work out by
Area to cover

Add a rectangle for each part of an L-shaped or split room.

Common tile sizes. 12 in, 16 in and 24 in squares, and 12 x 24 in rectangles. Use the size printed on the box. Editorial rule of thumb.
in
in
in
%
Area100 sq ft
Tiles with no waste100
Tiles to buy, with waste110 tiles
Boxes (10 per box)11 boxes (110 tiles)
Area the tiles cover110 sq ft

10 × 10 ft = 100 sq ft. 100 sq ft ÷ one 12 × 12 in tile = 100 tiles; with 10% waste = 110, rounded up to 110.

Diagonal or patterned layouts need more waste, commonly 15%. Grout and adhesive are not included.

Fig. 1 100 sq ft of 12 x 12 in tile.

Every formula is tested against worked examples. How we check

WasteTilesBoxes
5%105 tiles11 boxes
10%110 tiles11 boxes
15%115 tiles12 boxes

Fig. 2 The same floor at common waste allowances.

Last checked 11/10/2026. Defaults are editorial rules of thumb; each one is explained in the guide below.

Tile size changes the count

A 12 × 12 in tile covers exactly 1 sq ft, so 100 sq ft is 100 tiles before waste. A 6 × 6 in tile covers a quarter of that, so the same floor needs 400 tiles, or 440 with 10% waste. Larger tiles mean fewer to buy, but more cutting at the edges, so you may want a higher waste allowance.

The grout joint adds a little: with a 1/8 in joint, each 12 in tile covers 12.125 × 12.125 in, so you need about 2% fewer tiles. Set the joint in the calculator to see it.

Boxes. The tool rounds up to whole boxes using the tiles-per-box you enter (10 here is only an example, so check your box). Buy all boxes at once, as shades vary between production runs.

Common questions

How many 12x12 tiles are in a box?

It varies by product. Boxes commonly hold 10 to 15 tiles; enter the number printed on yours.

How much waste for a diagonal layout?

Diagonal layouts commonly need about 15% rather than 10%, because more tiles are cut at the edges.

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