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How many 20x20 tiles do you need? One 20 × 20 in tile covers 2.778 sq ft, so 100 sq ft takes 40 tiles with 10% waste. Enter the room for tiles and boxes.
With these inputs:
| Result | Value |
|---|---|
| Tiles to buy | 48 tiles |
| Area to cover | 120 sq ft |
| Area including waste | 132 sq ft |
| Tile size | 20 x 20 in |
| One tile covers | 2.778 sq ft |
| Boxes needed | 8 boxes |
| Waste applied | 10% |
Tile is sold by the box — round up and keep one spare box from the same dye lot.
Need the whole roof at once? The free roofing calculator works out roof area, squares, shingle bundles, underlayment, drip edge, ridge cap and installed cost from one set of measurements.