Tile Calculator
Enter the area you're tiling in feet and your tile size in inches. The calculator adds a waste percentage for cuts and breakage and rounds up to whole tiles.
This calculator ignores grout-line width, which slightly overstates the tile count — a safe direction to err. If you want to account for grout, add the grout width to each tile dimension before entering it.
How this is calculated
Tiles = (area in sq ft ÷ area of one tile in sq ft) × (1 + waste ÷ 100), rounded up.
One tile's area in square feet = (tile length in inches × tile width in inches) ÷ 144. Boxes = tiles ÷ tiles per box, rounded up.
Common questions
How much waste should I plan for?
10% is a common starting point for straight layouts. Diagonal or herringbone patterns, small rooms with many cuts, and large-format tile all push waste higher.
Should I buy extra beyond the waste allowance?
Keeping a few spare tiles from the same production lot is a good idea. Later batches can vary slightly in color and size, so replacements bought later may not match.
Does this work for walls?
Yes. Use the wall's width and height as the area dimensions. For a backsplash or shower with multiple walls, calculate each wall and add the tile counts.
Why does it round up to whole tiles and boxes?
You can't buy a fraction of a tile, and most stores sell full boxes. Rounding up matches what you'll actually purchase.