Tiling needs three things sized: the tiles, the thinset and the grout.
Tiles
Work out the area to cover, then divide by the area of one tile. Add 10 percent for cuts and breakage, or 15 percent for diagonal and patterned layouts. A 12 by 12 inch tile covers one square foot, so 100 square feet at 10 percent waste is 110 tiles.
Thinset and grout
Thinset coverage depends on the trowel notch and tile size, and grout depends on the tile size and joint width. Both are printed on the bag, so match them to your tile and gap rather than guessing.
Keep spares
Set aside a few tiles for future repairs, since matching later is rarely possible.
Count your tiles. Tile Calculator →
Common questions
How many 12 by 12 tiles for 100 square feet?
With 10 percent waste, 110 tiles, since each covers one square foot.
How much extra tile should I buy?
Ten percent for a straight layout, 15 percent for diagonal or patterned.
More Calculators
Concrete New
Enter slab dimensions. Result rounds up with a 7 percent waste allowance.
Gravel New
Enter the area dimensions and depth. Result rounds up with a 5 percent waste allowance.
Mulch New
Enter the bed area and depth. Result rounds up with a 5 percent allowance.
Topsoil New
Enter the area and depth. Result rounds up with a 5 percent allowance.
Paint New
Enter total wall area and coats. Result rounds up to whole units.
Flooring New
Enter room area and the coverage printed on the box. 10 percent waste added.
Tile New
Enter the area and one tile size. 10 percent waste added.
Drywall New
Enter total area to cover. 10 percent waste added.
Paver New
Enter the patio size and one paver size. 5 percent waste added.
Sand New
Enter the area and depth. 5 percent allowance added.
Roofing New
Enter the roof surface area. 10 percent waste added. Three bundles per square.
Insulation New
Enter area to cover and the coverage printed on the package. 5 percent added.
Fence New
Enter total fence length and post spacing.
Sod New
Enter the area to cover. 5 percent allowance added.
Grass Seed New
Enter area and seeding rate. Default rates suit a new lawn.
Fertilizer New
Enter area, target nitrogen rate and the first number on the bag.
Cubic Yards New
Enter length, width and depth. No waste added.
Square Footage New
Enter length and width.
Board Foot New
Enter board dimensions and quantity.
Material Cost New
Enter quantity, unit price, tax and delivery. Figures are in your own currency.