Paint & interior · updated 2026
Tile Calculator — Boxes & Tile Counts
Tile is sold by the box, boxes are labeled in square feet, and your floor is measured in square feet — but you still need the per-tile count to plan the layout and cuts. This tile calculator takes your floor area and tile size, adds 10% cutting waste, and returns both the exact tile count and the box count, with 2026 material costs. Always check your box's stated coverage (usually 5–15 sq ft) and adjust the calculator's default if yours differs — one wrong assumption here means a shortfall on install day.
Printed on the box; commonly 5–15 sq ft
10% for straight layouts; 15% for diagonal
Show the math
Tiles = 100.0 × 144 ÷ 144.0 sq in/tile = 100.0 (rounded up)
With 10% waste = 100.0 × 1.10 = 110.0 tiles (rounded up)
Boxes = 100.0 × 1.10 ÷ 10 sq ft/box = 11 (rounded up)
Materials = 100.0 × 1.10 × $2–$7/sq ft (ceramic)
What the numbers mean
The calculator converts your measurements into a practical purchase quantity using a documented coverage or spacing assumption.
Any whole-unit quantity is rounded up so the result does not leave you short during the project.
Use the cost range as a planning baseline and confirm the final quantity, availability, and delivery charge with your local supplier.
2026 material prices
| Material | 2026 average price | Note |
|---|---|---|
| Ceramic tile | $2.00 – $7.00 / sq ft | Materials only |
| Porcelain tile | $3.00 – $10.00 / sq ft | Materials only |
| Thinset mortar, 50-lb bag | $15.00 – $25.00 / 50-lb bag | Covers ~75–100 sq ft |
Material prices: Wave 1 Batch 2 2026 national-average guide, Sep 2026. Local prices vary. 2026 U.S. national averages. Prices vary by region and retailer — confirm locally before buying.
Pro tips
- Buy all boxes from the same dye lot — the code is printed on the box, and a second order will never match exactly.
- Diagonal layouts look premium and hide out-of-square rooms, but bump waste to 15% — every edge is a cut.
- Dry-lay the first row from the room's center line; starting at a wall guarantees a sliver cut on the far side.
- Keep a spare box after the job; a cracked tile in five years is a 10-minute fix if you have a match.
- Large-format tile (12×24) needs a perfectly flat floor — lippage on big tiles is unforgiving.
- A 100 sq ft floor in 12×12 tile needs 110 tiles in 11 boxes — verify your box's coverage before trusting any calculator.
Common questions
Frequently asked questions
How much 12×12 tile for 100 sq ft?
100 tiles + 10% waste = 110 tiles, or 11 boxes at 10 sq ft per box.
How many 6×6 tiles for the same floor?
100 × 144 ÷ 36 = 400, plus 10% waste = 440 tiles.
How many 12×24 tiles?
100 × 144 ÷ 288 = 50, plus 10% waste = 55 tiles.
How much waste should I add?
10% for straight layouts; 15% for diagonal patterns or rooms with lots of jogs.
Why do box counts vary between calculators?
Box coverage varies 5–15 sq ft by product — always use your box's printed figure.
What does tile cost per square foot?
$2–$7 for ceramic materials — a 100 sq ft floor runs about $220–$770 in tile alone.
Related calculators
Planning estimates only. Prices are 2026 U.S. national averages and vary by region — confirm with your local supplier before buying.