Calculators
Bathroom calculators: wall tiles, adhesive, radiator, fan and fall
How much wall tiles to buy, how many bags of adhesive and buckets of grout to get, what output the heated towel rail and fan should have, how much the floor will drop in a level-access shower, and approximately how much the renovation will cost. The calculators are free and without registration, and they calculate based on manufacturer data and standards. The result is indicative – verify it with a tiler, plumber, or with us in the showroom before purchase.
When renovating a bathroom, the most common mistake is the amount of material. When something is missing, work stops, and the purchased wall tiles may be a different shade. When there is too much, bags and boxes are left at home. The calculators below will help you make the first estimate before purchase.
- 01Adhesive and grout consumptionEnter the area, tile format, and joint width and depth. It will calculate kilograms, number of bags of adhesive, and packages of grout.Open calculator
- 02Radiator output for the bathroomEnter the area, height, and type of building. It will estimate the required watts and recalculate the catalog output of the heated towel rail according to the water temperature.Open calculator
- 03Fan outputEnter the bathroom or WC, area, and length of duct. It will calculate the required m³/h, air exchange, and recommend the type of fan.Open calculator
- 04Fall in the level-access showerEnter the dimensions of the shower and the drain or outlet. It will calculate how much the floor drops and what height of floor construction you need.Open calculator
- 05How much wall tiles and floor tiles to buyArea with a reserve for cuts according to the laying method and number of packages.Open calculator
- 06Cost of bathroom renovationIndicative budget based on the size of the bathroom, scope of work, and equipment.Open calculator
- 073D bathroom plannerDesign your bathroom yourself, for free. The area of wall tiles and floor tiles, including a reserve, will be calculated from the design.Open planner
In what order to calculate
| Step | What you will find out | Calculator |
|---|---|---|
| 1. Dimensions and design | layout, areas of walls and floor | 3D bathroom planner |
| 2. Wall tiles and floor tiles | m² with reserve and number of packages | How much wall tile to buy |
| 3. Adhesive and grout | kg, bags and buckets | Adhesive and grout consumption |
| 4. Level-access shower | fall and height of the floor for the drain or outlet | Fall in the shower |
| 5. Heating | required watts and size of the heated towel rail | Radiator output |
| 6. Ventilation | m³/h and type of fan | Fan performance |
| 7. Budget | estimated cost of work and materials | Renovation cost |
Basis for the calculators
We calculate adhesive consumption based on the table in the technical data sheet of Ceresit CM 11 Plus – it depends on the size of the tile and the depth of the notched trowel. We calculate grout consumption according to the formula provided by Mapei in the technical data sheet for Ultracolor Plus grout. The radiator output is estimated based on the volume of the bathroom and the type of building, and we recalculate it according to the manufacturer Korado's catalogue, which specifies the output of the ladder at various water temperatures.
The results are indicative. Actual adhesive consumption depends on the evenness of the substrate, heat requirements are determined by calculating heat losses, and the renovation cost depends on the condition of your bathroom. When working with water, electricity, and during construction modifications, always consult a professional – tiler, plumber, heating engineer, or electrician.
Floor height and ventilation
The shower gradient calculator takes into account the heights of the drains from the technical data sheets of Alcadrain and a gradient of 1 to 2 % according to the drain manufacturer. The fan calculator is based on the table of ventilation requirements for apartments – bathroom 50 to 90 m³/h, separate WC 25 to 50 m³/h. You can also find the procedure in the articles Creating a fall in the shower floor and Fan for the bathroom.
We would be happy to check the calculator results for you in the showroom – you can see wall tiles, adhesives, grouts, radiators, and drains live at our store in Senec at Bratislavská 71.
Terms in the dictionary: Grout · Catalogue radiator output (75/65/20 °C) · Air exchange · Fall · Shower tray · Linear shower drain
Frequently Asked Questions
Are the calculators free?
Yes. The calculators are free, without registration and without entering an email. You will see the result immediately.
How accurate are the results?
The results are indicative. They are based on manufacturer data and common rules. Actual consumption depends on the substrate, method of work, and specific product, so verify the data before purchase in the technical sheet or with a professional.
How much adhesive and grout to buy for wall tiles?
Adhesive according to format 2 to 4.8 kg per m², grout for large formats with a narrow joint around 0.1 kg per m², for small tiles even more than 0.5 kg per m². The adhesive and grout consumption calculator will calculate it precisely.
What output does the radiator need for the bathroom?
For a rough estimate, multiply the volume of the bathroom by 40 to 100 W per m³. A bathroom of 2.5 × 2 m with a height of 2.6 m thus needs approximately 520 to 1,300 W. The radiator output calculator will refine this according to the type of building and water temperature.
AI Advisor
Have a question on the topic? Ask the advisor – they will respond based on TGB Kúpeľne articles.
AI advisor – answers are generated by artificial intelligence from TGB Kúpeľne articles and may contain errors.
Bathroom design
These are tips. We will draw your bathroom for you.
In the 3D bathroom planner, you can design your bathroom yourself – for free and without registration. If you want assurance, we will prepare a photorealistic custom visualisation based on actual dimensions and specific tiles in the studio. It's free with a purchase.
Online design for free Custom visualisation
TGB Kúpeľne Studio · Bratislavská 71, Senec · Mon–Fri 8:00–12:00 and 12:30–17:00, Sat 9:00–12:00 · Map
