Calculating Tile: How Many Tiles Do You Need?
Whether you are tiling a bathroom floor, kitchen backsplash, or shower surround, getting the right number of tiles saves both time and money. Too few and your project stops mid-way. Too many and you waste money on material you will never use. Our tile calculator tells you exactly how many tiles you need, including waste for cuts and breakage.
How to Calculate Tile Quantity
The basic process is straightforward:
- Measure the area to be tiled (length × width)
- Calculate the area of one tile
- Divide total area by tile area
- Add waste percentage for cuts and breakage
How Much Waste Should I Add?
Waste factor depends on tile size and layout complexity:
- 5-7% — simple straight lay, large tiles, few cuts
- 10% — standard room, average complexity (most common)
- 15% — diagonal pattern, many cuts, many corners
- 20%+ — mosaic tiles, custom patterns, complex shapes
Common Tile Sizes
Tile sizes have expanded dramatically in recent years:
- Mosaic — 1" × 1", 2" × 2" (on mesh sheets)
- Subway tile — 3" × 6", 4" × 12"
- Standard floor — 12" × 12", 16" × 16"
- Large format — 18" × 18", 24" × 24", 12" × 24"
Example: 120 sq ft Bathroom Floor
120 sq ft with 12" × 12" tiles, 10% waste:
- Tile area: 12 × 12 ÷ 144 = 1.0 sq ft per tile
- Exact count: 120 ÷ 1 = 120 tiles
- With 10% waste: 120 × 1.1 = 132 tiles
Buying Tips
- Always buy from the same dye lot to avoid color variation
- Save a few extra tiles for future repairs (store with the box label)
- Larger tiles cover faster but have more waste from cuts
- Grout and thinset are separate — about 2-3 lbs of grout per 100 sq ft
FAQ
How many 12x12 tiles do I need for 100 square feet?
About 100 tiles exactly, or 110 with 10% waste. Each 12"×12" tile equals one square foot.
What tile size makes a room look bigger?
Larger tiles with minimal grout lines generally make rooms feel larger.
Can I tile over existing tile?
Sometimes yes, but check with the tile and substrate must be sound. Consult a professional for best results.