Tile Calculator — How to Estimate Tile Quantity
Estimate how many tiles you need from room area in m² (or length × width), tile size in cm, and waste percent (default 10%). Example: a 12 m² room with 30×30 cm tiles and 10% waste → 147 tiles (rounded up). Runs in your browser; numbers stay on your device and are not uploaded to a server.
How it works
Choose area or length × width for the room, enter tile size in centimetres, and set waste percent. The tool converts tile size to square metres, multiplies room area by (1 + waste/100), divides by one tile’s area, and rounds up. All math runs in your browser tab; your numbers are not uploaded to a server.
Formula and assumptions
Tile count uses room area, single-tile area, and a waste allowance:
- Room area A = direct m², or length × width in metres.
- Tile area a = (length_cm ÷ 100) × (width_cm ÷ 100) in m².
- Tiles = ceil(A × (1 + waste% ÷ 100) ÷ a). Waste default is 10%.
Example
Example: room 12 m², tiles 30×30 cm, waste 10%. One tile is 0.09 m². Needed area with waste = 12 × 1.10 = 13.2 m². Tiles = ceil(13.2 ÷ 0.09) = ceil(146.666…) = 147.
When to use it
- Order floor tiles for a bathroom or kitchen before visiting the store.
- Rough-check a wall tiling quote against simple area and waste math.
- Compare 30×30 cm vs larger formats by changing tile size and watching the count.
Frequently asked questions
Why does the calculator round up?
You cannot buy a fraction of a tile. Rounding up (ceil) matches how packs are purchased after cuts and breakage.
What does the waste percent mean?
Waste adds spare area for cuts, pattern matching, and broken pieces. The default is 10%; complex or diagonal layouts often need more.
Should I enter area or length × width?
Either works. Use area if you already know the m²; use length × width when you have room dimensions in metres.
Are my numbers uploaded?
No. Dimensions are calculated in your browser on your device and are not uploaded to a server.
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Questions or feedback
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