Tile Square Footage Calculator
Measure once, order once. Enter your area, pick your pattern, and get the square footage with the right waste allowance plus the exact boxes to buy. Free, instant, no signup.
Quick answer
Tile square footage is length × width — then add waste by pattern: 10% straight, 12% brick offset, 15% diagonal, 20% herringbone. Boxes = adjusted area ÷ box coverage, always rounded up. A 10×12 room, straight lay, 12 sq ft boxes: 120 → 132 sq ft → 11 boxes.
Your tile square footage
Boxes to buy
11
132 sq ft incl. 10% waste
- Base area
- 120 sq ft
- Area with 10% waste
- 132 sq ft
- Boxes for the job
- 11
- With 1 spare box (same dye lot)
- 12
- Tile cost
- $330
- Cost incl. spare box
- $360
Boxes always round UP — never down. Buy everything from one dye lot in a single order; a top-up months later frequently will not match. The spare box is cheap insurance against a cracked tile years from now.
How the calculation works
- Measure the real area: length × width per rectangle. L-shaped room? Add the second area — split the shape, never guess.
- Add waste: adjusted area = base area × (1 + waste %). The pattern decides the rate — angled cuts along every wall are why diagonal costs more than straight.
- Convert to boxes: boxes = adjusted area ÷ coverage per box, rounded UP. 9.2 boxes means buy 10.
- Add one spare box from the same dye lot for future repairs — it's the cheapest insurance in the whole project.
Waste allowance by pattern
| Pattern | Waste | Why |
|---|---|---|
| Straight grid | 10% | Edge cuts and the odd break only |
| Brick offset | 12% | Staggered cuts at both ends of each row |
| Diagonal | 15% | Angled cuts along every wall |
| Herringbone / chevron | 15–20% | Complex pattern matching at every border |
| Large-format (24 in +) | 15% | Each break loses a whole tile |
The full method — L-shape math, wall measuring, and the dye-lot rule — is in our tile square footage guide. Need tile counts, thinset, and grout too? Use the full tile calculator.
Worked example: a 10×12 floor, two patterns
A 10×12 ft kitchen floor is 120 sq ft before anything else happens. Watch what the pattern does to it:
- Straight grid (10% waste): 120 × 1.10 = 132 sq ft to buy. In boxes of 12 sq ft, that's 11 boxes.
- Herringbone (20% waste): 120 × 1.20 = 144 sq ft — 12 boxes.
Same floor, same tile — the pattern alone adds a box. Every angled cut in a herringbone or diagonal layout throws away part of a tile, and the waste allowance is where that reality gets priced in before you're standing in the aisle.
Mistakes that throw off the estimate
- Measuring an L-shaped room as one rectangle. The missing leg of the L is exactly where shortages come from. Measure the room as two rectangles and add them.
- Using the straight-lay allowance for a pattern. Brick offset, diagonal, and herringbone each waste more than a plain grid. Running herringbone on a 10% allowance is the most reliable way to run out of tile on the last wall.
- Planning to the exact square foot. Tile is sold by the full box, and your last row is almost never a clean multiple of the box coverage. Always round the box count up — a sealed box returns; a missing half-box in a discontinued line doesn't get found.
- Measuring only the visible floor. Tile runs under the stove and refrigerator and into the pantry and closet. Measure the full footprint, including the parts furniture and appliances hide.