Tile Calculator
Calculate the number of tiles needed for any floor or wall area, accounting for grout gaps and waste percentage.
Tile Calculator tool
Example
Input: Floor 12 x 10 ft, 12 x 12 in tiles, 0.125 in grout gap, 10% waste
Result: 130 tiles (118 without waste), 11 boxes (~12 tiles/box)
Each tile plus grout covers (12.125 / 12)^2 = 1.021 sq ft, so 120 sq ft / 1.021 = 117.5, or 118 tiles; adding 10% waste and rounding up gives 130.
Tiles Needed for 100 Square Feet
| Tile size (in) | No waste | 10% waste | 15% waste |
|---|---|---|---|
| 3 x 6 | 753 | 829 | 866 |
| 4 x 4 | 847 | 932 | 975 |
| 6 x 6 | 384 | 423 | 442 |
| 12 x 12 | 98 | 108 | 113 |
| 12 x 24 | 50 | 56 | 58 |
| 18 x 18 | 44 | 49 | 51 |
| 24 x 24 | 25 | 28 | 29 |
With a 1/8 inch grout gap, a 10 x 10 ft area, rounded up as the calculator does.
- Enter the length and width of the floor or wall area to be tiled, in feet.
- Specify the tile dimensions - width and height - in inches.
- Set the grout gap width to adjust the effective coverage area of each tile.
- Choose a waste percentage between 5% and 20% (typically 10-15%) to account for cuts, breakage, and pattern matching.
- Review the total number of tiles and the estimated boxes needed, then copy the results for your shopping list.
Working Out How Many Tiles You Need
To count tiles, divide the floor area by the area of one tile plus its grout line, then add a waste allowance. A 12 x 10 ft floor with 12 x 12 in tiles and 1/8 in grout needs 118 tiles. With 10% waste, buy 130.
Enter the floor size in feet and the tile size and grout gap in inches. The grout line makes each tile take up a bit more room, so a 12 in tile with a 1/8 in joint covers a 12.125 in square. That is why fewer tiles are needed than a plain area split suggests. The results show the floor area, the tile count before and after waste, and the area of one tile.
You also get a box estimate based on common box sizes: 25 tiles for 6 in and smaller, 12 up to 12 in, 8 up to 18 in and 5 for larger tiles. Check the real count on the box you buy.
Waste covers cut pieces at the edges, breakage and a few spares. Set it from 5% to 20%. About 10% suits a simple straight layout in a plain room. Choose 15% or more for diagonal or herringbone patterns, small rooms with many cuts, or natural stone. Keep a few spare tiles after the job. Tiles from a later batch may not match in color if one cracks years from now.
The tool assumes a rectangle. For an L-shaped room, split it into two rectangles and add the results. For a wall, use its width and height in place of length and width. To plan the paint for the walls around a new floor, try the Paint Calculator.
Formula / How It Works
Frequently Asked Questions
Related Tools
Area Converter
Convert between square feet, square meters, acres, hectares, square kilometers, and square miles.
Unit ConvertersLength Converter
Convert between meters, feet, inches, centimeters, kilometers, miles, yards, and nautical miles instantly.
Unit ConvertersPaint Calculator
Estimate gallons or liters of paint needed per room based on wall dimensions, coats, and door or window deductions.
Construction and HomeConcrete Calculator
Calculate cubic yards or meters of concrete needed for slabs, footings, and columns with optional waste factor.
Construction and Home