Tile Calculator
Estimate tile quantity for floor or wall projects based on area and tile dimensions.
Tiles Needed: —
Tile FAQ
How much waste should I add?
10% for straight lay; 15% for diagonal or complex patterns.
Should I measure in feet or inches?
Enter the area in square feet. Enter individual tile size in inches.
Results are estimates for planning purposes. Verify with product labels and local requirements before purchasing materials.
How to calculate tile quantity
Divide total area by the area of one tile. Convert tile dimensions to feet first: 12 in ÷ 12 = 1 ft, so a 12×12 tile covers 1 sq ft. An 18×18 tile covers 2.25 sq ft. A 24×24 tile covers 4 sq ft.
| Tile size | Sq ft per tile | Tiles per 100 sq ft | With 10% waste |
|---|---|---|---|
| 6×6 in | 0.25 sq ft | 400 tiles | 440 |
| 12×12 in | 1.00 sq ft | 100 tiles | 110 |
| 18×18 in | 2.25 sq ft | 45 tiles | 50 |
| 24×24 in | 4.00 sq ft | 25 tiles | 28 |
Tile installation tips
- Start from the center of the room and work outward for even border cuts.
- Dry-lay tiles first to verify pattern and spacing before adhesive.
- Use tile spacers for consistent grout lines.
- Order all tiles from the same dye lot to ensure color consistency.
- Buy 10% extra and store tiles for future repairs.
Frequently asked questions
How many 12x12 tiles do I need for a 10x10 room?
100 square feet ÷ 1 sq ft per tile = 100 tiles. Add 10% waste: 110 tiles total.
How many 18x18 tiles for 200 square feet?
An 18×18 tile covers 2.25 sq ft. 200 ÷ 2.25 = 89 tiles + 10% = 98 tiles. Buy 100.
What waste factor should I use for diagonal tile?
15–20% for diagonal (45°) or herringbone patterns due to additional angled cuts at every edge.
Should I seal grout?
Yes — seal within 72 hours of installation and annually after. Sealer prevents staining and simplifies cleaning.
What is PEI rating for tile?
PEI (Porcelain Enamel Institute) measures wear resistance. Floor tiles need PEI 3 or higher. PEI 5 is for high-traffic commercial floors.
Related tools
- Square Footage Calculator — calculate your floor or wall area
- Grout Calculator tip — estimate materials for your project
- Drywall Sheet Calculator — estimate drywall for walls before tiling
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