Tile Calculator
Tiles and boxes needed for a floor or wall, including cutting waste.
Tile Calculator
| Area to tile | 120.0 sq ft |
| Coverage per tile | 1.000 sq ft |
| Tiles needed (incl. waste) | 132 |
| Boxes to buy | 14 |
A 12 × 10 ft room is 120 sq ft. With 12×12 in tiles (1 sq ft each) and 10% waste you need 132 tiles — 14 boxes of 10.
Measure the area in feet, enter your tile size in inches, and this calculator works out how many individual tiles cover the area — then adds your waste allowance for cuts, breakages and future repairs, and rounds up to full boxes.
The waste percentage matters: 10% is standard for straight layouts in rectangular rooms, but diagonal (45°) layouts, large-format tiles and rooms with many corners should use 15–20%. Tile counts and boxes are always rounded UP to whole units.
The formula
Worked example
A 12 × 10 ft room is 120 sq ft. With 12×12 in tiles (1 sq ft each) and 10% waste you need 132 tiles — 14 boxes of 10.
The example is pre-loaded in the result panel — press Calculate with your own numbers to replace it.
Frequently asked questions
How much extra tile should I buy?
10% extra for straight layouts, 15% for diagonal layouts or large tiles, and 20% for complex rooms. Keep a few spare tiles from the same dye lot for future repairs — matching a discontinued tile later is often impossible.
Does the grout gap change the count?
Slightly. This calculator uses the tile face area only, which is the standard estimating method; the grout lines add a small amount of coverage that is absorbed by the waste allowance.
How do I handle an L-shaped room?
Split it into two rectangles, run the calculator for each, and add the tile counts together before dividing by tiles per box.
Category: Construction & Home calculators
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