How Many Tiles for a 3x5 Bathroom Floor? (2026 Guide)
How many tiles for a 3×5 bathroom floor? The floor is 15 sq ft: you need 15 twelve-inch tiles or 34 eight-inch tiles — buy 17 or 38 with the 10% waste allowance.
Three steps: area, tile size, 10% extra
1. Measure the floor area
A 3×5 ft bathroom is 3 × 5 = 15 sq ft. The method below works for any rectangle: square footage first, then divide, then add waste.
2. Divide by what one tile covers
A 12×12 in tile covers exactly 1 sq ft, so 15 ÷ 1 = 15 tiles. An 8×8 in tile covers 64 sq in — about 0.444 sq ft — so 15 ÷ 0.444 ≈ 33.8, which rounds up to 34 tiles. Always round up: nobody sells a third of a tile. Not sure? Let the tile calculator do the division.
3. Add 10% and round up again
Buying extra covers cuts at the walls, a chipped corner or two, and a spare for future repairs. 15 × 1.1 = 16.5 → 17 tiles; 34 × 1.1 = 37.4 → 38 tiles. On a floor this small, nearly every perimeter tile gets cut — the allowance matters more.
How many tiles a 3×5 ft floor takes, by tile size
Counts below use the full 15 sq ft, round each division up to the next whole tile, then add the 10% and round up once more:
| Tile size | Area per tile | Tiles needed | Buy with 10% extra |
|---|---|---|---|
| 6×6 in | 0.25 sq ft | 60 | 66 |
| 8×8 in | 0.444 sq ft | 34 | 38 |
| 12×12 in | 1 sq ft | 15 | 17 |
| 12×24 in | 2 sq ft | 8 | 9 |
| 2×2 ft (24×24 in) | 4 sq ft | 4 | 5 |
Check the rounding at both ends of the table: 15 ÷ 0.25 = 60 tiles, and 60 × 1.1 = 66 to buy; 15 ÷ 4 = 3.75 → 4 tiles, and 4 × 1.1 = 4.4 → 5 to buy. For any other room size, see how many tiles you need per square foot.
Toilets, vanities and the "net" floor
These numbers estimate full coverage of the 15 sq ft. In practice the toilet footprint and vanity base are often subtracted before ordering, and many quotes use a smaller "net" floor. Working from a net figure? Divide that smaller number instead — and confirm how your openings are measured before you buy. Full coverage is the safe upper bound either way.
Floor tile math stops at the tile: grout is separate, and small 6×6 or 8×8 floors mean more grout lines to fill. Estimate the bags with our grout guide.
Buying tips for a small bathroom floor
- Small tiles mean more grout lines — a 6×6 layout has far more joints than 12×12, so it eats more grout and slightly more time, even though the tile count math stays the same.
- Budget for the threshold — the strip at the door and the slivers along the tub are separate cuts that rarely come out of a full row, so keep a few whole tiles back for the doorway instead of using every piece on the main field.
- Always buy the +10% — with only 15 sq ft, a single broken tile during cutting is a large share of the floor; the allowance also gives you a matching spare if one ever needs replacing. Order all boxes from the same dye lot so shades match.
Planning the rest of the bath? Use the same round-up-plus-10% playbook when you count how many tiles for a shower.
FAQ
How many 12×12 tiles do I need for a 3×5 bathroom floor?
About 17 tiles. A 3×5 ft floor is 15 sq ft and each 12×12 tile covers 1 sq ft, so the base count is 15 tiles. Adding the 10% waste allowance gives 16.5, which rounds up to 17 tiles to buy.
How many 8×8 tiles do I need for a 3×5 bathroom floor?
About 38 tiles. Each 8×8 tile covers 64 sq in — about 0.444 sq ft — so 15 ÷ 0.444 ≈ 33.8, rounded up to 34 tiles. With the 10% allowance that's 37.4, rounded up to 38 tiles to buy.
Do floor tiles need a bigger waste allowance than wall tiles?
Not for a typical layout — the same 10% applies to floors and walls. Floors get cut at the threshold, corners and fixtures, while walls lose material around windows and tub edges, so the two usually balance out. Budget more than 10% only for diagonal layouts or heavy pattern-matching.
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