Tile Calculator
Count tiles including grout lines and cutting waste.
Your numbers
%
Your results
Tiles (no waste)
Tiles (no waste)
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Tiles to buy (with waste)
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Area (sq ft)
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Tile Calculator by TheCalcTools
How the Tile Calculator works
Enter the area in inches, the tile size and the grout joint.
Each tile effectively occupies tile size + one grout joint along each side.
Divide the area by that footprint and add the waste allowance.
The formula
Tiles = (length ÷ (tile length + joint)) × (width ÷ (tile width + joint))Buy = ⌈tiles × (1 + waste)⌉
Worked example
Using the default values shown in the calculator:
| Area length (in) | 120 |
|---|---|
| Area width (in) | 96 |
| Tile length (in) | 12 |
| Tile width (in) | 12 |
| Grout joint (in) | 0.125 |
| Waste allowance | 10 % |
- Area = 120 × 96 in = 80.0 sq ft.
- About 79 tiles fit; buy 87 with waste.
Result:
| Tiles (no waste) | 79 |
|---|---|
| Tiles to buy (with waste) | 87 |
| Area (sq ft) | 80.0 |
Frequently asked questions
How much extra should I buy?
10% for standard layouts, 15–20% for diagonal patterns or large tiles with many cuts.
Do I need to include grout?
Yes. Joints slightly increase the footprint of each tile, so fewer tiles are needed than a plain area ratio suggests.
Sources and further reading
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This calculator gives estimates for information only. Check important results independently before you rely on them. See our disclaimer.