The Tile Calculator estimates how many tiles you need to cover a floor or wall, including grout gaps and waste.
You need about 317 tiles
| Tiles needed (with waste) | 317 |
| Tiles without waste | 288 |
| Area to cover | 300 sq ft |
| Each tile | 144 sq in |
Divide the area to cover by the area of one tile plus its grout gap. Then add extra for cuts, breakage and future repairs: about 10% for straight layouts and 15–20% for diagonal or herringbone patterns.
Worked example (defaults): a 20 × 15 ft floor is 300 sq ft. A 12-inch tile with a ¼-inch gap covers about 1.04 sq ft, so you need about 288 tiles, or 317 with 10% extra.
Buy all tiles from the same batch (dye lot) to avoid color differences. Lay out the tiles dry first, starting from the centre so cut pieces at the edges are equal. Use the right adhesive and grout for the location, especially in wet areas.
How wide should grout lines be? 1/16 in to 1/4 in for floors depending on tile.
Do I subtract cabinets? Yes, measure only the area to be tiled.
How are tiles sold? Often by the box, covering a set area; round up to whole boxes.