Learn to calculate ceramic, slate stone and tiles 2026

If you find it difficult to calculate ceramics, tiles, etc.? Then learn to calculate ceramics, slate stone and tiles easily.

To cover the floors or walls of the house, palmets of various materials and styles can be used such as: ceramic, ceramic tile, slate-type tiles or stones.

There are different alternatives that will depend on the taste of each person and the place where they want to install them.

To know exactly how many boxes of ceramics we have to buy, it is necessary to calculate the surface of the space in which we are going to install them.

Learn how to calculate ceramics in simple steps

To make it easier to calculate the palmettes needed according to the size of each space, here we propose some formulas.

Step #1: Identify the surface and calculate its size

A. Simple figure surface:

Rectangular or square space. Simply multiply the width by its length.

Composite figure surface:

Space composed of more than one simple figure. In this case it is advisable to decompose the surface to
Identify simple figures. This way we can calculate the area of each of them and then add them.

This space is made up of a square and a rectangle:

Composite figure surface with diagonals:

Space composed of more than one simple figure, and with diagonals. If we cannot identify simple figures, we can project them to complete a figure that is more familiar to us and easier to calculate.

For example, in this case the space has a diagonal wall. So, to calculate the surface without complicating things, it is best to decompose the figure into a rectangle larger than 2 x 4 m, and complete the remaining triangle to form another rectangle. In this way we are left with a larger rectangle, and this new smaller rectangle of 1 x 2 m.

The small rectangle is formed by two equal triangles, so by dividing its surface in two, we will obtain the square meters of the triangular space that we have to cover.

Walls with doors, windows or furniture:

Many times the walls on which we want to install ceramics have doors, windows or kitchen furniture. In these cases, it is advisable to calculate the total surface area, and then subtract these elements, since they will not have palmettes.

Recommendation

Consider possible surplus material

• In most cases, the measurements of the palmettes do not exactly coincide with the dimensions of the walls and floors.
• Then the ceramics must be cut to fit exactly the surfaces we are going to cover.
• When ceramics are cut to a specific size, there is generally a surplus that is not used, unless we are lucky enough to have it match somewhere else.
• For all these cuts that generate some type of loss in the palmettes, it is necessary to account for an additional 5%.

If our surface to cover measures 20 m², we must calculate 5% of this surface.

Step #2: How many ceramic boxes to buy

Identify the performance of the box:

Manufacturers indicate on the label the performance of each box, which varies according to the size of the palmette:

Examples of performance indication on different ceramic cases.

A. Palmettes of equal size:

If we want to install ceramic tiles with all the panels of the same size, we must divide the total number of meters of the surface we want to cover by the performance indicated on the label to know how many boxes we need. Thus, if the ceramic to be installed is sold in boxes that have a yield of 2.5 m2, we calculate it as follows:

As the palmettes are sold per box, then we must buy 5 boxes. We can save the remaining palmettes, since in the future we may need them in case one breaks, is damaged, or we have to make a small repair.

B. With palmettes of different sizes:

To form a special design we can install palmettes of different sizes. For example: batuco-type ceramic tiles with two types of palmette:
One measuring 20 x 20 cm, surrounded by four measuring 5 x 25 cm.

In these cases, we can calculate how many palmettes of each type fit in an area of 1 m2. By making a diagram of the figure that the tiles will form, we can determine that we have a square of 30 x 30 cm left, that is, 0.30 m x 0.30 m.

This means that each design of four rectangles and a central square covers an area of 0.30m x 0.30m = 0.09 m2. To know how many times this design fits in a square meter, we simply have to divide a square meter by this value:

So 11 combination games fit in one square meter.
Since each combination game has one large tile and 4 small ones, we multiply:

That is, 1 m2 contains 11 20 x 20 cm tiles and 44 5 x 25 cm tiles. To determine the total number of palmettes needed, simply multiply the calculation for 1 m2 by the total number of square meters of the surface we wish to cover.
In this case, we have an area of 12 m2. To calculate how many tiles we need, we must multiply the amount that fits in one square meter by the total number of meters of the surface, that is, 12 m2.

Knowing the number of units needed, we can calculate how many boxes of each type of ceramic we need. Thus, if 10 palmettes come in a box, we must divide the number of units needed in total by the number of palmettes that come in a box:

We then need to buy 14 boxes of the large tile and 53 boxes of the small tile.

Learn how to calculate ceramics with us in simple steps.

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