How this tile calculator works
Enter the tile size, the area to cover (as length × width or as a total area), and the grout gap. The tile calculator works out how many tiles cover the area, how many boxes to buy if you enter the tiles per box, and the cost if you enter a price per tile, per box, or per square foot. It also lists how much to buy with 5% and 10% extra for waste. It works as a floor tile calculator, wall tile calculator, or tile estimator for a whole room, in inches and feet or in metric units.
For example, a 14 × 11 ft floor (154 sq ft) with 18 × 18 in tiles and ⅛ in grout lines needs 68 tiles, or 12 boxes of 6. With 10% extra for cuts, buy 75 tiles (13 boxes).
How many tiles do I need?
Each tile covers its own size plus one grout joint along its length and its width. The calculator divides the area by that coverage and rounds up to a whole tile:
Tiles = area ÷ [(tile length + gap) × (tile width + gap)]
With a ⅛ in gap, an 18 × 18 in tile covers 18.125 × 18.125 = 328.52 sq in, or about 2.28 sq ft, so 154 sq ft takes 68 tiles. Boxes are the tile count divided by the tiles per box, rounded up. For overlapping tiles, such as roof tiles or siding, enter the overlap as a negative gap.
Tile square footage calculator: measuring the area
For a rectangular room, measure the length and width and enter them directly. For an L shape or a room with a closet, split it into rectangles, add up the square footage, and use the Total Area option. Subtract large areas that won't be tiled, such as a kitchen island or a tub, but not small ones like vents. If you think in square feet, the tile calculator square feet result is shown with square meters alongside.
Frequently asked questions
How much tile do I need to buy, with extra for waste?
Buy 5–10% more than the exact count for a straight layout in a simple room, and 10–15% or more for diagonal, herringbone, or running bond patterns, large tiles, or rooms with many corners. Leftover tiles from the same batch are useful for repairs later, since color can vary between production runs.
How do I use this as a shower tile calculator?
Measure each wall to be tiled, multiply height by width, and add them together. A 5 ft back wall and two 3 ft side walls, all 8 ft high, total 88 sq ft. With 12 × 24 in tiles and ⅛ in grout lines that is 44 tiles, or 48 with 10% extra. Figure the shower floor separately if it uses a different tile.
How many tiles for a backsplash?
As a backsplash tile calculator, enter the backsplash area minus any window. A 30 sq ft backsplash in 3 × 6 in subway tile with ⅛ in grout lines needs 226 tiles, or 249 with 10% extra.
What grout gap should I use?
Grout joints usually range from 1/16 in for rectified tiles to ½ in for handmade or rustic tiles, with ⅛ in to ¼ in common for floor tile. Follow the tile manufacturer's recommendation. A wider gap slightly lowers the number of tiles but uses more grout.
Limitations
The count is based on area, so it does not lay out rows or account for how cut pieces can be reused at the edges. The extra 5–10% covers typical cuts and breakage, but complex layouts, small rooms, and large-format tiles can waste more. When tiles are priced by area, the cost is the area to cover times the price. Check box coverage on the label before you buy.
What's changed
- Launched.