🔲 Bathroom Tile Calculator
Enter your area, tile size, waste allowance, and tiles per box to see how many tiles you need — waste included — and how many boxes to buy for a bathroom floor or wall.
🧮 Count Your Tiles
🔲 Tiles you'll need
| Area | 100 sq ft |
| Tile size | 1 sq ft each |
| Tiles (no waste) | 100 |
| Tiles with waste | 110 |
| Boxes to buy | 11 → 110 tiles |
Buy enough tile the first time
Running short on tile mid-project is the classic renovation headache — dye lots shift between batches, so the replacement box rarely matches, and popular tiles sell out. Order too much, though, and you've tied up money in boxes you'll return or store for years.
This calculator sizes the order properly: it turns your area and tile size into the number of tiles, adds a waste allowance for cuts and breakage, and rounds up to whole boxes so you know exactly what to carry home — with a sensible cushion for repairs.
❓ Frequently Asked Questions
How much extra tile should I buy for waste?
A 10% waste allowance is standard and the default here — it covers cuts around the edges, the odd cracked tile, and offcuts you can't reuse. Bump it to 15–20% for diagonal, herringbone, or other patterned layouts, and for small busy rooms with lots of fixtures to cut around. Keeping a few spare tiles after the job is smart for future repairs, since dye lots change.
How does the calculator work out the number of tiles?
It divides your total area by the area of a single tile (tile length × width, converted from inches to square feet), rounds up to whole tiles, then adds your waste percentage. Finally it divides by the tiles per box and rounds up to whole boxes, since you can't buy a partial box — so the total you buy usually includes a little overage.
Where do I find the tiles-per-box number?
It's printed on the box or the product listing, usually alongside the square footage each box covers. Large-format tiles come just a few to a box; small tiles come many more. Enter the actual figure for your tile so the box count is accurate — the coverage per box is what ultimately determines how many you carry home.
Should I measure floor and walls separately?
Yes. Floor and wall tiles are often different sizes and sold separately, so run the calculator once for each area with its own tile size and box count. Add up the boxes at the end. For walls, measure each wall's height and width and subtract large openings like a window or the tub surround if it isn't being tiled.