Tile Calculator
How many tiles a floor or wall needs, by tile size, with waste included.
- Area to tile (sq ft)120.0
- With 10% waste (sq ft)132.0
- Tiles to buy132
Inputs used
- Area length12 ft
- Area width10 ft
- Tile size12" × 12" (1 sq ft)
About this calculator
Divide the area by the coverage of one tile and add waste: this calculator builds in 10% for cuts, breakage and pattern matching, which suits a straightforward grid layout. Diagonal layouts, herringbone and rooms with many corners run 15% or more — and keeping a few spares for future repairs is always worth it, since dye lots vary between batches.
A 12" × 12" tile covers exactly one square foot; an 18" × 18" covers 2.25; large-format 24" × 24" covers 4. Plank tiles are listed by their coverage too.
Measure the true area to be tiled — for walls, height × width per wall, added up. Grout, spacers and adhesive scale with the same area, so the tile count doubles as the shopping reference for the whole job.
Quick reference
Number of 12×12 tiles by room size
Count of 12" × 12" tiles (1 sq ft each, 10% waste included) by area length and width in feet.
| Area length | 5 ft | 8 ft | 10 ft | 12 ft | 15 ft |
|---|---|---|---|---|---|
| 5 ft | 28 | 44 | 55 | 66 | 83 |
| 8 ft | 44 | 71 | 88 | 106 | 132 |
| 10 ft | 55 | 88 | 110 | 132 | 165 |
| 12 ft | 66 | 106 | 132 | 159 | 198 |
| 15 ft | 83 | 132 | 165 | 198 | 248 |
| 20 ft | 110 | 176 | 220 | 264 | 330 |
Tiles needed by tile size — 10 ft wide area
Tiles needed (10% waste included) for a 10 ft wide area, by area length and tile size.
| Area length | 6" × 6" (0.25 sq ft) | 12" × 12" (1 sq ft) | 12" × 24" (2 sq ft) | 18" × 18" (2.25 sq ft) | 24" × 24" (4 sq ft) |
|---|---|---|---|---|---|
| 5 ft | 220 | 55 | 28 | 25 | 14 |
| 8 ft | 352 | 88 | 44 | 40 | 22 |
| 10 ft | 440 | 110 | 55 | 49 | 28 |
| 12 ft | 528 | 132 | 66 | 59 | 33 |
| 15 ft | 660 | 165 | 83 | 74 | 42 |
| 20 ft | 880 | 220 | 110 | 98 | 55 |
Frequently asked questions
How many 12x12 tiles do I need for a 10x12 room?
A 10 × 12 room is 120 square feet, and with 10% added for waste that's 132 square feet. Since a 12" × 12" tile covers exactly one square foot, you need 132 tiles.
How much extra tile should I buy for waste?
About 10% for a standard grid layout, which this calculator adds automatically. Diagonal, herringbone or heavily patterned layouts run 15% or more, and it's always worth keeping a few spares since dye lots vary between batches.
How many tiles are in a square foot?
It depends on tile size: a 12" × 12" tile is one per square foot, a 6" × 6" is four, an 18" × 18" covers 2.25 square feet, and a 24" × 24" covers 4. Divide your area by the coverage of one tile to get the count.
How do I calculate tiles for a wall instead of a floor?
Measure each wall's height times its width and add the walls together for the total area, then divide by the tile coverage. The waste allowance works the same way — grout and adhesive scale with the same area.
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