Tile Calculator

The Tile Calculator estimates floor area and the number of tiles needed for a rectangular room. Enter the floor length and width, tile length and width, and a waste percentage for cuts and breakage.

Calculation method

The calculator uses the same unit for floor and tile dimensions:

$\text{Floor area}=\text{Floor length}\times\text{Floor width}$ $\text{Area with waste}=\text{Floor area}\times\left(1+\frac{\text{Waste percent}}{100}\right)$ $\text{Tiles to buy}=\operatorname{ceil}\left(\frac{\text{Area with waste}}{\text{Tile length}\times\text{Tile width}}\right)$

Worked example

For a 4 m by 3 m room using 0.3 m by 0.3 m tiles and 10% waste:

1. Floor area: 4 x 3 = 12 m2.
2. Area with waste: 12 x 1.10 = 13.2 m2.
3. Tile area: 0.3 x 0.3 = 0.09 m2.
4. Tiles to buy: ceil(13.2 / 0.09) = 147 tiles.

Choosing a waste percentage

Straight layouts with few cuts need less allowance than diagonal layouts, small rooms, irregular edges, or brittle materials. Use a higher allowance when matching replacement tiles may be difficult.

Frequently Asked Questions

Do I need to convert units first?

Only make sure floor and tile dimensions use the same unit. Four metres by three metres cannot be divided by tile dimensions in centimetres until the units are made consistent.

Does the result include grout or joint spacing?

No. Tile area is calculated from the entered tile dimensions without grout-joint deductions.

Why does the calculator round up?

Tiles are purchased as whole pieces, so the result uses a ceiling operation to avoid under-ordering.

Limitations

The tool models one rectangular floor area. It does not account for multiple rooms, borders, niches, pattern direction, tile boxes, grout, adhesive, or exact offcut reuse. Measure complex layouts separately and check the supplier's box coverage.