Calculate tiles needed for floors or walls. Includes waste percentage and box estimate for accurate DIY planning.
Tile Calculator | Boxes & Waste Estimate
This tile calculator helps estimate how many tiles and boxes you need for any flooring or wall tiling project. When activated, the calculator will allow you to enter total area, tile size, and waste percentage to get an accurate estimate.
Tile Quantity Calculator
Enter floor size and tile size to see how many tiles you need.
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Why Waste Percentage Matters
Tiles break, edges get cut, and corners require trims. That is why professional tile installers always add 5–15% extra depending on layout complexity.
- Straight lay: 5–7% waste
- Diagonal layout: 10–12%
- Herringbone/complex patterns: 12–15%
Example
Room size: 4m × 3m = 12 m²
Tile size coverage per tile: 0.04 m² (e.g., 20cm × 20cm)
12 ÷ 0.04 = 300 tiles baseline
If waste is 10%:
300 × 1.10 = 330 tiles
If each box contains 25 tiles:
330 ÷ 25 = 13.2 → 14 boxes
When to Increase Waste
- Patterned tiles that need directional alignment
- Small tiles with many cuts
- Narrow bathrooms with corners and pipes
- Tiles prone to chipping or cracking during cuts
Tiles Per Box
Always check:
- Coverage per box on the packaging
- Whether grout lines affect total layout area
Box coverage typically ranges between 1–1.5 m² per box.
FAQs
How much extra should I buy?
Minimum 5% for straight layouts, up to 15% for patterned layouts.
Does grout change tile count?
Grout lines don’t change area coverage enough to impact total calculation significantly.
Can I calculate for walls and floors?
Yes, the full calculator will support both.
What if tiles go out of stock?
Buying extra prevents mismatched batches or tone differences later.