Tile Calculator
Enter the room dimensions and tile size, choose a waste allowance, and get the number of tiles to order.
Your details
Result
Tiles to order (+10% waste)
148
134 with no waste
- Room area
- 12.00 m²
- 10% waste suits simple layouts, 15% diagonal patterns. Round up to full boxes.
Good to know: A 4 m × 3 m room with 30 cm tiles needs 134 tiles, or 148 with 10% waste.
Please note: Estimates only. Measure your actual space, buy a little extra, and check product labels, safety requirements and local building rules. Do not rely on this for structural or safety-critical work.
About this tool
Calculate how many tiles you need based on room area and tile size — for home renovation and flooring projects.
Formula
Tiles needed = (room area ÷ tile area) × (1 + waste%). Waste allowance typically 10-15%.
Reference values
- 10% waste for simple layouts
- 15% waste for diagonal patterns
- Always round up to full boxes
Questions people ask
How much extra should I buy?
About 10% for simple layouts and 15% for diagonal or patterned ones.
Do grout lines matter?
They change the count slightly. Add a little extra, or include the grout width in the tile size.
Should I round to full boxes?
Yes. Tiles are sold by the box.
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How we calculate this
We use the standard published formula or definition for this calculation, and we show the working so you can check it.
Spotted a mistake? Tell us and we'll check it. How we check our calculators