How many tiles do you need?
Pick your tile, add the floor or wall, get tiles, square feet and boxes instantly.
How do I calculate how many tiles I need?
Measure the floor or wall in square feet, add 10% for cuts, then divide by the area of one tile including its grout joint. A 10 by 10 ft floor is 100 square feet; with 10% extra that is 110. A 12 by 24 inch tile with a ⅛ inch joint takes up 12.125 × 24.125 ÷ 144 = 2.03 square feet, so you need 110 ÷ 2.03 = 54.2 — round up to 55 tiles.
How much extra tile should I buy?
About 10% for a straight layout in a simple room, 15% for a diagonal layout or a room with lots of corners, and 20% for herringbone. Keep a few spare tiles after the job: the same batch is hard to find later, and a cracked tile is easy to replace when you have a match.
How many square feet are in a box of tile?
It depends on the tile. Boxes of 12 by 24 inch tile usually hold 8 pieces, about 16 square feet; 12 by 12 inch tile often comes 10 to 15 to a box. The label or product page gives the square feet per box — add it with + Add a box size and the calculator counts boxes too.
Does the grout joint change how many tiles I need?
A little. Each tile covers its own area plus half the joint on every side, so wider joints mean fewer tiles. With small tiles the difference adds up: a 4 by 4 inch tile with a ¼ inch joint covers about 13% more than the tile alone. Enter your joint width and the count allows for it.
How much thin-set mortar do I need?
It depends on the trowel, and the trowel on the tile. A 50 lb bag covers about 90 square feet with a ¼ × ¼ inch square-notch trowel (tiles up to 8 inches), 60 with ¼ × ⅜ inch (8 to 16 inch tiles) and 42 with ½ × ½ inch (larger tiles). A 100 square foot floor of 12 by 24 inch tile takes the ½ inch trowel: 100 ÷ 42 = 2.4, so buy 3 bags.
How much grout do I need?
Grout fills the joints, so it depends on the joint width, the tile thickness and how many joints there are: small tiles need far more than large ones. For 100 square feet of 12 by 24 inch tile, ⅜ inch thick, with ⅛ inch joints, the joints hold about 5.4 pounds — one 25 lb bag with plenty to spare. The same floor in 3 by 6 inch tile of the same thickness takes about 21 pounds.
How do I measure a bathroom or a room that isn't a rectangle?
Split it into rectangles, triangles and circles, measure each piece and add them with + Add another area. For walls, enter each wall as width by height and leave out the tub, windows and doors. Add a backsplash or shower wall the same way.