Tile Calculator
Enter the area you're tiling and the tile size, and this gives the number of tiles — and boxes — to buy, with a waste allowance for cuts.
Tiles
110tiles
- Boxes
- 11 boxes
- Area
- 100 sq ft
How it’s calculated
One tile covers (width × length) ÷ 144 square feet. Tiles = area × (1 + waste) ÷ that coverage, rounded up. Boxes = tiles ÷ tiles-per-box, rounded up — tile is sold by the box, and the count per box is on the carton.
Worked example
100 sq ft of 12 × 12-inch tile (1 sq ft each), 10 per box, 10% waste: 100 × 1.10 ÷ 1 = 110 tiles → ⌈110 ÷ 10⌉ = 11 boxes.
FAQs
- How much extra tile should I buy?
- About 10% for a straight layout, 15% or more for diagonal, herringbone, or a room with lots of cuts and corners. Keep a few spares from the same lot for future repairs — shades drift between production runs.
- Why enter tiles per box?
- Tile is sold by the box, and the count per box depends on the tile size — a box of 12×12s holds far fewer than a box of mosaics. Using the figure off your carton makes the box count accurate.
- Does this cover the floor and walls?
- Enter whatever area you're tiling — add up floor, wall, and backsplash areas separately and total them. Subtract large openings if you want a tighter number, but the waste allowance usually absorbs them.
Sources
- Tiles = area × (1 + waste) ÷ ((tile width × length) ÷ 144), rounded up; boxes = tiles ÷ per-box, rounded up. Geometry; tiles-per-box is product-specific (from the carton).