Tile Calculator
Enter the size of the floor or wall, the tile size and the grout joint width. The calculator counts the tiles that cover it, adds your waste percentage and rounds up to a whole tile. Type how many tiles come in a box and it counts the boxes too.
As a decimal: 1/8 in is 0.125, 1/16 in is 0.0625. 0 for none.
Your own allowance for cuts and breakage. 0 for none.
Check your product's packaging. Leave empty to skip the box count.
Tiles with 10% waste
130
Tiles without waste
118
Boxes to buy
17
Tiles in those boxes
136
Spare tiles
6
Area to tile (sq ft)
120
One tile with its joint (sq in)
147.016
Tiles = area ÷ ((tile length + joint) × (tile width + joint)). The waste is added first, then the count is rounded up to a whole tile, and boxes are rounded up to a whole box. Areas are rounded to six significant figures. 1 in = 2.54 cm.
How to use the Tile Calculator
- Enter the area as length and width, or switch to "Area" and type a total. Pick feet or meters.
- Pick inches or centimeters for the tile, then type its length, its width and the grout joint width. A 1/8 in joint is 0.125.
- Type your waste percentage. Use 0 for none.
- For a box count, type the tiles per box from the packaging. Leave it empty to skip the boxes.
- Read the tiles with and without waste and, if you gave a box size, the boxes and the spare tiles. The results update as you type, so there is no button to press.
The tile count formula
Tiles = area × (1 + waste % ÷ 100) ÷ ((tile length + joint) × (tile width + joint)), rounded up Boxes = tiles ÷ tiles per box, rounded up
Each tile takes up its own size plus one joint width in each direction, so the calculator divides the area by that larger footprint instead of the bare tile. It adds the waste first, then rounds up to a whole tile, and rounds boxes up to a whole box. You can mix units, such as a floor in feet and tiles in centimeters. The calculator converts with 1 in = 2.54 cm and keeps every figure exact until the end. Areas are rounded to six significant figures. The count does not take out cabinets, tubs or anything else you won't tile, so subtract those from the area first.
Worked example
The fields start with these numbers, so you can check each result. A floor 12 ft by 10 ft is 120 sq ft, or 17,280 sq in. A 12 × 12 in tile with a 0.125 in joint takes up 12.125 × 12.125 = 147.015625 sq in, shown as 147.016. 17,280 ÷ 147.015625 = 117.54, so 118 tiles cover the floor without waste. With 10% waste it is 129.29, rounded up to 130 tiles. At 8 tiles per box that is 17 boxes, which hold 136 tiles and leave 6 spare.
Frequently asked questions
Why does the grout joint change the tile count?
Every tile takes up its own size plus a joint. A 12 × 12 in tile covers 144 sq in, but with a 0.125 in joint it takes up 147.016 sq in. On a 120 sq ft floor that is 118 tiles instead of 120, before waste. Wider joints and smaller tiles make the gap bigger.
How much waste should I allow for tile?
The calculator leaves that to you. It depends on the layout, the room and the tile, so check the tile maker's installation guide or ask your supplier. The 10 in the field is a starting value for the example, and 0 gives the bare count.
How many tiles come in a box?
That depends on the product, so check your product's packaging or its product page. Type the number into "Tiles per box" and the calculator rounds the boxes up and shows how many tiles are left over. The 8 in the field is a starting value for the example.
Does it work for walls and backsplashes?
Yes. Enter the height of the wall as the length. If a window or door breaks up the wall, work out the area to tile yourself and use the "Area" option.
Can I use metric tiles on a floor measured in feet?
Yes. Pick feet for the floor and centimeters for the tile. A 12 × 10 ft floor with 30 × 60 cm tiles and a 0.3 cm joint needs 62 tiles without waste and 68 with 10% waste. Each tile with its joint takes up 1,827.09 cm².