How many 12x12 tiles for a 12x12 floor?

159 tiles. A 12 × 12 ft floor is 144 square feet, and 12 × 12 inch tiles cover 1 sq ft each — 144 tiles plus a 10% cutting allowance (158.4, rounded up).

How many 18x18 tiles for a 12x12 floor?

71 tiles. Each 18 × 18 inch tile covers 2.25 sq ft, so 144 ÷ 2.25 = 64 tiles, plus 10% waste = 70.4, rounded up to 71.

How many 24x24 tiles for a 12x12 floor?

40 tiles. Each 24 × 24 inch tile covers 4 sq ft, so 144 ÷ 4 = 36 tiles, plus 10% waste = 39.6, rounded up to 40.

What waste percentage should I add for tile?

10% is standard for straight layouts in rectangular rooms. Use 15% for diagonal layouts, rooms with many corners, or large-format tiles where each cut wastes more.

Do I subtract for closets or fixtures when counting tile?

Generally no — tile usually runs under vanities, appliances, and into closets. Measure the full floor area; the waste allowance absorbs the small savings from any cutouts.

Guide

How Many Tiles Do I Need for a 12x12 Floor?

A 12 × 12 foot room is exactly 144 square feet. With standard 12 × 12 inch tiles — one square foot each — that is 144 tiles, and a 10% cutting and breakage allowance brings the order to 159. Larger tiles cut the count substantially, as the tile-size chart below shows.

Key Takeaways

A 12 × 12 ft floor is exactly 144 square feet.
With 12 × 12-inch tiles: 144 tiles + 10% waste = 159 tiles.
With 18 × 18-inch tiles: 64 tiles + 10% = 71 tiles.
With 24 × 24-inch tiles: 36 tiles + 10% = 40 tiles.
Bump the waste allowance to 15% for diagonal layouts or rooms with many corners.

Calculate Your Tiles

How to Calculate Tiles for a 12x12 Floor

Tile count comes from the floor area divided by the area of one tile, plus a waste allowance for cuts and breakage. Always round up — a partial tile still costs a full tile.

1Measure the floor: 12 ft × 12 ft = 144 square feet.
2Find the area of one tile: a 12 × 12 inch tile covers 1 square foot.
3Divide floor area by tile area: 144 ÷ 1 = 144 tiles.
4Add a 10% cutting allowance: 144 × 1.10 = 158.4.
5Round up: order 159 tiles.

The Tile Count Formula

Tiles are counted by area, not by length. Convert the tile dimensions to square feet first (divide inches by 12), then divide the floor area by the area of one tile and multiply by 1.10 for the standard 10% waste allowance.

Tiles needed = Floor area (sq ft) ÷ Area per tile (sq ft) × 1.10

Worked Example: 12 ft × 12 ft Floor with 12 × 12 in Tiles

Here is the full calculation using standard 12 × 12 inch tiles, plus a chart showing how larger tiles change the count.

Step 1

Floor area: 12 ft × 12 ft = 144 square feet.

Step 2

Tile area: 12 × 12 inches = 1 square foot per tile.

Step 3

Base count: 144 ÷ 1 = 144 tiles.

Step 4

Waste allowance: 144 × 0.10 = 14.4 tiles.

Step 5

Order total: 144 + 14.4 = 158.4 → round up to 159 tiles.

Tile size	Area per tile	Tiles with 10% waste
12 × 12 in	1.00 sq ft	159
18 × 18 in	2.25 sq ft	71
24 × 24 in	4.00 sq ft	40

Common Mistakes

Ordering the exact tile count with no waste allowance — cuts and chips will leave you short.
Forgetting that grout lines and tile spacers do not change the count much, but waste does.
Measuring the room but not subtracting nothing — unlike paint, you tile under vanities and appliances, so measure the full floor.
Mixing dye lots — buy all tiles at once, since later batches can differ slightly in shade.
Using the same 10% for a diagonal layout — bump it to 15% when tiles are laid on the diagonal.

Practical Tips

Keep a few spare tiles after the job — matching dye lots years later is nearly impossible.
Dry-lay a row of tiles first to plan cuts and avoid slivers along the walls.
For rooms with closets, alcoves, or many corners, use 15% waste instead of 10%.
Larger tiles mean fewer grout lines and a faster install, but more waste per cut.
Use the NOVORY Tile Calculator to double-check your count for any room and tile size.