Calculating your tiles needed is straightforward once you know the Tile formula and what each input means. This guide explains the method in plain language, walks through a manual calculation, and gives worked examples you can follow — then you can do it instantly with the Tile Calculator.
What is Tile?
The Tile calculation tells you your tiles needed from a few simple inputs. The figure you are solving for here is the tiles needed.
The Tile formula
This calculation combines several inputs through a multi-step method rather than a single one-line formula. Enter the values below and the calculator resolves each step in order. The inputs it needs are:
- Area to tile — a value measured in sq ft. Example: 120 sq ft.
- Tile length — a value measured in in. Example: 12 in.
- Tile width — a value measured in in. Example: 12 in.
- Wastage allowance — a percentage, such as an annual rate. Example: 1%.
How to calculate it step by step
- Write down the area to tile (for example, 120 sq ft).
- Write down the tile length (for example, 12 in).
- Write down the tile width (for example, 12 in).
- Write down the wastage allowance (for example, 1%).
- Apply the formula above to get your tiles needed.
- Double-check the result with the Tile Calculator.
Worked examples
Example 1
| Input / Output | Value |
|---|---|
| Area to tile | 120 sq ft |
| Tile length | 12 in |
| Tile width | 12 in |
| Wastage allowance | 1% |
| Tiles needed | 132 |
| Area per tile (sq ft) | 1.000 |
With area to tile of 120 sq ft, tile length of 12 in, tile width of 12 in and wastage allowance of 1%, the tiles needed works out to 132.
Example 2
With area to tile of 240 sq ft, tile length of 12 in, tile width of 12 in and wastage allowance of 1%, the tiles needed works out to 264.
| Result | Value |
|---|---|
| Tiles needed | 264 |
| Area per tile (sq ft) | 1.000 |
Example 3
With area to tile of 60 sq ft, tile length of 12 in, tile width of 12 in and wastage allowance of 1%, the tiles needed works out to 66.
| Result | Value |
|---|---|
| Tiles needed | 66 |
| Area per tile (sq ft) | 1.000 |
Tips for an accurate result
- Keep your units consistent — mixing, say, months with years or grams with kilograms is the most common source of error.
- Round only at the very end. Rounding inputs early can shift the final answer noticeably.
- Re-run the numbers whenever an input changes, rather than estimating from an old result.
Prefer not to do the maths by hand? — the Tile Calculator does it instantly, for free, with the formula and a worked example built in.
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