Tile direct answer
How much tile for a bathroom floor?
A typical 5 ft by 8 ft bathroom floor is 40 sq ft. With 10% waste, buy at least 44 sq ft of tile, or 3 boxes if each box covers about 16 sq ft.
Quick answer
| Bathroom example | 5 ft x 8 ft |
|---|---|
| Base area | 40 sq ft |
| Waste allowance | 10% |
| Order area | 44 sq ft |
| 16 sq ft boxes | 3 boxes |
Calculation steps
- Multiply floor length by width: 5 x 8 = 40 square feet.
- Add 10% waste for cuts and layout: 40 x 1.10 = 44 square feet.
- Divide by box coverage: 44 / 16 = 2.75 boxes.
- Round up to whole boxes: buy 3 boxes.
- Add more waste if the room has diagonal layout, many jogs, a niche threshold, or a tile with a large pattern repeat.
How to decide what to buy
Measure the actual tileable floor
Some bathroom floors continue under a vanity, while others stop at cabinet legs or a tub apron. Measure what will actually receive tile, including closet jogs and thresholds.
Waste depends on layout
Ten percent is a common straight-lay allowance. Herringbone, diagonal, large-format tile, patterned tile, and small rooms with many cuts can justify 15% or more.
Keep attic stock
Buying one extra box can be smarter than trying to match dye lots later, especially for discontinued tile or bathrooms where future plumbing repairs are possible.
Project-specific notes
The 44 sq ft answer is based on a simple 5x8 bathroom floor with a straight layout. That is common for a hall bath, but the real tileable area may exclude a tub footprint, include a linen closet, run under a vanity, or wrap around a toilet flange and threshold.
Small bathrooms often have a high cut percentage because the room has many edges relative to its area. Large-format tile can look clean, but it may create more waste around toilets, doorways, and narrow strips. Mosaic sheets can reduce cutting but may need more layout care at walls and drains.
Tile ordering is also a dye-lot decision. If a box breaks or a repair is needed later, the same tile name may not match perfectly. For bathrooms, one extra unopened box can be useful attic stock when the product is not a commodity item.
Buying checklist
- Measure only the floor that will receive tile, including closets and thresholds.
- Check square feet per box and whether trim pieces are sold separately.
- Confirm waste allowance before choosing diagonal, herringbone, or large-format layouts.
- Keep unopened attic stock if the tile is special order or likely to be discontinued.
Recalculate if
- The bathroom is larger than 5x8 or includes a separate toilet room.
- The layout is diagonal, herringbone, checkerboard, or a patterned repeat.
- You are tiling under a removable vanity or into a closet.
- The tile box coverage is not close to 16 sq ft.
Common mistakes
- Using room wall dimensions without subtracting a fixed tub or shower footprint.
- Forgetting that tile boxes round up to whole boxes.
- Buying exactly 40 sq ft and having no material for broken tiles, cuts, or future repairs.
Sources and methodology
This page uses the same geometry and coverage assumptions as BuilderCalc calculators, then turns the result into a direct answer for one common project. Change the dimensions, depth, waste factor, box coverage, or paint coverage in the calculator before buying.