Bathtub dimensions: 4 things you should know

2025-04-01.

What are the best dimensions for a bathtub? See how to choose the ideal size for your bathtub, taking into account four determining factors.

One of the greatest pleasures of a bath is soaking in a comfortable bathtub that allows you to relax after a long day. But, for this moment to be truly pleasurable, it is essential to choose the right size of your bathtub. A poorly chosen bathtub can make the experience less than comforting. If the bathtub is too large for the space, it can be uncomfortable and make it difficult to move around in the bathroom. Conversely, a bathtub that is too small can make you feel uncomfortable using it, especially if you prefer to enjoy long baths.
In this post, we're going to tell you everything you need to know about choosing the ideal size of your bathtub. We will discuss the four key factors that will influence your decision. With the right choice, you will not only have a functional bathtub, but also a harmonious and practical bathroom.

What are the standard dimensions of a bathtub? 

In general, bathtub dimensions are standardised, and the vast majority of manufacturers abide by these dimensions in almost all their products. However, there are some exceptions that are best suited for those seeking a bathtub outside the usual standards. An example of the latter are the possibilities you can find among the decorative bathtubs made at KRION.

Krion Aro Bathtub

In standard terms, a bathtub needs a space measuring approximately 70 centimetres wide and about 120-140 centimetres long.

However, if you have the space, larger Solid Surface bathtubs are much more comfortable: 80 centimetres wide and about 150-180 long.

If you are thinking about a larger bathtub, in addition to measuring the available space, it is worth analysing whether a bathtub of this size will be comfortable and practical in your bathroom.

How long is a freestanding bathtub?

Freestanding bathtubs are usually a little larger than built-in bathtubs. At KRION we have several models in different sizes that are suited to all needs.

For example, the Tono model measures 195 x 90 cm. With the same length, but slightly less wide, is the Aro bathtub (195 x 80 cm).

Krion Tono Bathtub

Other options, such as the Almond or Pure models, are 180 cm long. The difference between these two bathtubs is in the width: Almond is 95 cm wide, while Pure is 90 cm wide.

Krion Almond Bathtub

If you have a smaller space, a shorter bathtub is a good idea. The Aro Air, Ras and Modul models measure 170 x 80. If your bathroom does not allow you to opt for such a large model, but you still want to enjoy the advantages of a freestanding bathtub, you can opt for the Modul model in its smaller version: 159 x 75 centimetres.

Krion Aro Bathtub

4 factors that affect the dimensions of bathtubs

These four factors are essential when selecting the dimensions of the bathtub you are installing at home. If you are designing your bathroom, take note of the following.

1. Available space

In a large bathroom, the space available allows you to choose a bathtub longer than 150 centimetres, where you can lie down comfortably. However, in a small bathroom it is highly important to take the layout into account to see if a bathtub fits and, if so, choose a smaller model. 

Krion Arch Bathtub

2. Placement of taps

Wall-mounted taps will not take up space in the basin and are the best option for small bathtubs. However, models such as the Tono bathtub have the option of incorporating the taps into the bathtub itself, as its size makes it easy and convenient to do so.

Krion Tono Bathtub

3. Height of the person who is going to use it

Depending on the height of those who will use the bathtub, it will need to be larger, or even smaller.

For example: a person who stands 1.50 m tall does not need a 180 cm bathtub to sit down.  On the other hand, for a 2-metre-tall person, a bathtub that is too small can be rather uncomfortable.

Krion Arch Bathtub

4. Minimum passage area

The width of the passage area needed for moving around in the bathroom, stepping into the bath and walking around the bathtub should never be less than 50 centimetres. However, 60 cm is best.

Krion Slim Bathtub

 

We hope these tips will help you to know what to consider when choosing the size of your bathtub. Choosing the right dimensions for a bathtub is essential to enjoy a comfortable, beautiful and functional bathroom to the fullest extent.