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Enter each wall's width and height, subtract doors and windows, pick a tile size and get tiles and boxes with 10% waste for bath, kitchen or accent walls.
With these inputs:
| Result | Value |
|---|---|
| Tiles to buy | 212 |
| Gross wall area | 64 sq ft |
| Net after openings | 64 sq ft |
| With waste | 70.4 sq ft |
| Tile face area | 0.333 sq ft |
Start the first course on a level ledger board — floors and tubs are rarely level.
<> Multiply wall width × height for each identical wall, then subtract openings (a standard door is ~21 sq ft, a small window ~6 sq ft, a large window ~12 sq ft). We divide by the tile face area and add waste. For walls, do not subtract tiny obstacles like outlets — the cut tile around them still consumes most of a tile. Only subtract openings bigger than about 2 sq ft.
1/16 in suits rectified (precision-cut) tile; 1/8 in is the safe standard for ceramic subway and handmade-look tile where edges vary. Never go below 1/16 in on walls.
Yes — any floor tile can go on a wall. The reverse is not true: wall-only tile is too soft for floors. Check the box for a wall-only marking before buying for a floor.
Common heights are 4 ft (wainscot), 6 ft (shower splash height), or full height. Full-height tile makes small bathrooms feel taller and costs roughly one extra row of labor.
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.