Tile Calculator – How Many Tiles Do I Need?
Calculate how many tiles you need for any floor or wall. Enter room size and tile dimensions for an exact count with waste factor included.
🧱 Construction📐 Tiles = Room Area / Tile Area x (1 + Waste %)
Room length (feet)
Room width (feet)
Tile size (inches sq)
Waste factor
Please enter valid values.
Formula & Reference
| Variable | Formula | Units |
|---|---|---|
| Tile Calculator – How Many Tiles Do I Need? | Tiles = Room Area / Tile Area x (1 + Waste %) | tiles |
Step-by-Step Examples
Example 1
12x10 ft Floor, 12-in Tiles
120 sq ft, 12 in tiles, 10% waste.
- Tiles: 132 | Boxes: ~9
✓ 132 tiles
Example 2
Bathroom 6x8, 18-in Tiles
48 sq ft, 18 in tiles, 10% waste.
- Tiles: 27
✓ 27 tiles
Example 3
Diagonal Layout 15x20
300 sq ft, 12 in tiles, 15% waste.
- Tiles: 345
✓ 345 tiles
Real-World Applications
DIYers
Know exactly how many tiles to buy.
Contractors
Quick material takeoff for any tile job.
Homeowners
Avoid running short on a tile project.
Estimators
Calculate tile quantities for bids.
Common Mistakes to Avoid
⚠️
Not adding waste
Diagonal layouts waste 15 percent or more. Always add waste factor.
⚠️
Different dye lots
Buy all tiles at once from the same lot — color varies between batches.
Frequently Asked Questions
How many tiles do I need? ▾
Divide room sq ft by tile sq ft, multiply by 1.10 for 10 percent waste, and round up.
How much waste to add? ▾
5 percent for simple rooms, 10 percent for L-shapes, 15 percent for diagonal or mosaic layouts.
How many sq ft per tile box? ▾
Usually 10-25 sq ft per box. Use the box label sq ft coverage, not the tile count.
How much grout do I need? ▾
1/8 in joint: 8-10 lbs per 100 sq ft. 1/4 in joint: 17-20 lbs per 100 sq ft.