Tile Quantity Calculator
A tile quantity calculator divides the area to be covered by the area of one tile and adds a wastage percentage for cuts, breakages and future repairs. Enter the floor in square feet and the tile in centimetres, the units most Indian and US tile listings mix, and it handles the conversion.
Last reviewed by the Radiatus Cloud team
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The calculation
Square feet are converted to square metres at 0.092903, tile dimensions are converted from centimetres to metres and multiplied to get one tile's area, and the room area is divided by that. The result is multiplied by one plus the wastage percentage and rounded up to the next whole tile. For a 200 square foot room and 60 by 60 cm tiles at 10 percent wastage: 18.58 square metres divided by 0.36 gives 51.6 tiles, times 1.1 is 56.8, so 57 tiles.
Choosing a wastage figure
| Layout | Wastage |
|---|---|
| Straight grid, square room, large tiles | 5 to 10 percent |
| Straight grid, room with alcoves or an island | 10 to 15 percent |
| Diagonal or herringbone | 15 to 20 percent |
| Small mosaic sheets | 5 percent |
Diagonal layouts waste more because every edge tile is a cut and the offcuts rarely reuse. Add a few extra tiles beyond wastage to keep for repairs; a batch bought later will not match the shade.
From tiles to boxes
Tiles are sold by the box, and the box states its coverage in square metres or the tile count. Divide the tile count from the calculator by tiles per box and round up. Order all boxes from one batch number, and ask the supplier to confirm it, because glaze colour varies between production runs.
What the calculator ignores
- Grout lines. A 2 to 3 mm joint on a 60 cm tile reduces the count by under 1 percent, well inside the wastage allowance. On 10 cm tiles it approaches 5 percent and starts to matter.
- Walls. Measure each wall as its own rectangle, subtract windows and doors, and run the calculator per wall or on the total.
- Rectified versus non-rectified edges, which change joint width but not count.
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Frequently Asked Questions
Why are area and tile size in different units?
Because that is how they are sold. Rooms are quoted in square feet in India and the US, while tile sizes are almost always metric, 30 by 60 or 60 by 60 cm. The calculator converts so you do not have to.
How much wastage should I add?
10 percent for a straight layout in a simple room, 15 percent with many cuts, 20 percent for diagonal or herringbone patterns. Add a handful of spare tiles on top for future repairs.
Does the result account for grout joints?
No. On tiles 30 cm and larger the effect is under 1 percent and covered by wastage. On small tiles or mosaics, reduce the count by a few percent or rely on the box coverage figure.
How do I calculate for a wall?
Multiply wall width by height for the area, subtract door and window openings, convert to square feet if you measured in metres, and enter that as the area. Repeat per wall.
Should I buy extra boxes?
Yes, from the same batch. One extra box on a small job, or 5 percent on a large one, covers breakage during fitting and matching repairs years later.
Privacy & Security
Calculated locally in your browser. No data is sent to any server.
How to Use
Enter floor area and tile size to estimate tiles needed.
Disclaimer: This tool is provided "as is" without warranty of any kind. Results are for educational and utility purposes.
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