Fug Calculator
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Grout calculator
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Other tools you may find usefulGrout wear under control - why are accurate calculations crucial before renovation?
Grout (joint) is an essential finishing material used when laying ceramic, stoneware or stone tiles. It has not only an aesthetic function, connecting the entire surface visually, but above all, a technical one - it compensates for micro-movements of the tiles, prevents moisture from penetrating under the cladding and protects against the development of mold. Before purchasing the material, it is crucial to precisely calculate the amount of joint needed. Purchasing too little grout may result in the need to purchase another package, which may come from a different production batch and have a slightly different shade of dye. In turn, excess material means unnecessary renovation costs.
Our precise online grout calculator allows you to calculate the exact consumption of grouting mortar in a few seconds (in kilograms per square meter m² and for the entire surface) based on the exact dimensions of the tile, the planned joint width and the density of the selected grout.
Formula for calculating grout consumption - how it works step by step
Grout consumption depends directly on the volume of gaps formed between the tiles. The classic mathematical formula is used for calculations, taking into account the geometry of the tiles and the physical properties of the mortar:
Consumption (kg/m²) = [ (A + B) / (A · B) ] · C · D · E
Where the individual symbols mean:
- A:The length of the tile expressed in millimeters (mm).
- B:The width of the board, expressed in millimeters (mm).
- C:Tile thickness expressed in millimeters (mm).
- D:Designed width of the joint (grout) expressed in millimeters (mm).
- E:Density coefficient of the grouting mortar expressed in kg/dm³ (standard value for cement mortars is approx. 1.5 - 1.6, and for heavier epoxy grouts approx. 1.7 - 1.8).
For example, if we lay tiles with dimensions of 300 mm by 300 mm, a thickness of 8 mm and a joint width of 3 mm, then with a cement joint density of 1.6 kg/dm³ the calculation is as follows:
Consumption = [ (300 + 300) / (300 · 300) ] · 8 · 3 · 1.6 = [ 600 / 90000 ] · 38.4 = 0.00667 · 38.4 = 0.256 kg/m².
Table of estimated grout consumption for popular tile sizes and joint widths
The table below shows the approximate consumption of standard cement grout (density 1.6 kg/dm³) for the most commonly used lining and joint formats:
| Tile dimensions (length x width x thickness) | Joint width (grout) | Estimated consumption (kg/m²) | Yield per package 2 kg | Yield per package 5 kg |
|---|---|---|---|---|
| Mosaic(20 x 20 x 4 mm) | 2 mm | 1.28 kg/m² (very high!) | Approx. 1.5 m² | Approx. 3.9 m² |
| Wall bricks(100 x 200 x 7 mm) | 3 mm | 0.50 kg/m² | Approx. 4.0 m² | Approx. 10.0 m² |
| Classic tiles(300 x 300 x 8 mm) | 3 mm | 0.26 kg/m² | Approx. 7.7 m² | Approx. 19.2 m² |
| Porcelain stoneware, medium(600 x 600 x 9 mm) | 2 mm | 0.10 kg/m² | Approx. 20.0 m² | Approx. 50.0 m² |
| Large-format stoneware(600 x 1200 x 10 mm) | 2 mm | 0.08 kg/m² | Approx. 25.0 m² | Approx. 62.5 m² |
| Wood-like tiles(200 x 1200 x 9 mm) | 2 mm | 0.17 kg/m² | Approx. 11.7 m² | Approx. 29.4 m² |
Frequently asked questions (FAQ)
How to calculate grout consumption per square meter using a mathematical formula?
The formula applies: Consumption (kg/m²) = [ (tile length + tile width) / (tile length · tile width) ] · tile thickness · joint width · joint density. All tile and joint dimensions should be given in millimeters (mm) and the density in kg/dm³ (standard 1.6).
What amount of grout should be included in the calculations?
It is recommended to add approximately 10% safety margin to the result obtained from the calculator or formula. This allowance covers any losses of material when mixing the joint, applying it to the tiles with a rubber trowel (a small part dries and is thrown away) and any corrections.
What is the difference between the density (E-factor) of cement grout and epoxy grout?
Traditional cement grouts have a density of 1.5 - 1.6 kg/dm³. Modern epoxy grouts (two-component mortars based on reactive resin) are much denser and heavier - their density coefficient is usually from 1.7 to 1.85 kg/dm³. This means that to grout the same surface with epoxy grout, we will need approximately 10-15% more kilograms of material.
Why does a mosaic require much more grout than large stoneware tiles?
The mosaic consists of hundreds of small cubes in every square meter, which generates a huge total length of joint joints. For example, per 1 m² of mosaic there are many times more linear meters of joint than in the case of large-format stoneware (60x120 cm), where there are only a few gaps. Therefore, the consumption of grout on mosaic can be up to 10 times higher.
What causes the actual consumption of grout to be greater than that calculated from the calculator?
The main factor is the uneven application of glue under the tiles. If air voids have formed under the edges of the tiles, the grout will press deep under the tile, dramatically increasing wear and tear. Other reasons include: porous, rough structure of the tiles (from which it is more difficult to wash off the excess), cleaning the grout with a sponge that is too wet (which rinses the joint) and imprecise dosing of water during mixing.