Stone Tile Coverage Calculator
Turn an area and a tile size into an exact tile count and the number of boxes to buy — with a waste allowance built in for cuts and breakage.
Tiles & boxes needed
Tile counts round up to whole tiles and whole boxes. Buy from a single dye lot and keep a few spares — natural stone tile varies in colour and veining between production runs.
Counting tile without coming up short
The core of any tile estimate is simple: the area you're covering divided by the area of a single tile. The part people get wrong is waste. Every edge, corner, and cutout means a tile gets cut, and the offcut is usually too small to use elsewhere — so the real tile count is always higher than the bare division suggests.
Because stone tile ships in full boxes and colour can drift between production lots, it pays to order the whole job at once with a sensible overage. A box of spares kept after the install is cheap insurance against a cracked tile years later, when the exact stone may no longer be available.
Frequently Asked Questions
How many tiles do I need per square foot?
Divide the area you're covering by the area of one tile. A 12×12-inch tile is exactly one square foot, so 100 square feet needs 100 tiles before waste. A 12×24-inch tile is two square feet, so the same area needs 50. This tool does the arithmetic from whatever tile size you enter.
How much waste should I add for stone tile?
Allow about 10% for a straight, grid layout and 15–20% for diagonal, herringbone, or other patterned work, where more tiles are cut at the edges. Rooms with lots of corners, niches, or obstructions also cut more tile. The waste percentage is added on top of the exact count and rounded up to whole tiles.
Why buy tile by the box?
Stone tile is sold in full boxes, so the tool converts your tile count into boxes using the tiles-per-box figure on the label and rounds up. It's normal to end up with part of a box left over — keep the spares for future repairs, since matching a discontinued lot later is difficult.
Does natural stone tile vary between boxes?
Yes. Marble, travertine, slate, and granite tiles vary in colour and veining from one production run — or dye lot — to the next. Buy all the tile for a job at once from a single lot, and dry-lay and blend tiles from several boxes as you go so any variation is spread evenly across the floor or wall.
Can I use this for a backsplash as well as a floor?
Yes — enter the wall or floor area you're covering and the tile size, and the method is the same. For a backsplash, measure the height and length of the run; for a floor, use the room's length and width, subtracting large fixed obstructions.
Educational estimate — confirm coverage against the tile's stated square footage and your own layout before ordering.