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How to measure a bathtub to ensure a safe and comfortable bathing experience

how to measure a bathtub
Written by Kai Michel

Bathtubs are one of the essential parts of the bathroom. It goes beyond a fixture; it is the centerpiece focus of the bathroom, and getting the tube will only increase the visual of the space in your bathroom and will add a contemporary elegance appearance.

However, before thinking of the artistic aspect of getting a tube in your bathroom, accurate knowledge of the size and measurement of the space available in your bathroom is extremely important.

If you are thinking of replacing your old bathtub or considering to buy something new, then this piece is for you. We will discuss more on the dimensions, types, and steps to measure out a tub.

Standard dimensions of different bathtubs

Let’s get this straight: a standard bathtub doesn’t exist. No measurement is considered as standard, and tubs are designed in different shapes, styles, and sizes.

We definitely can’t provide a list of standard shapes, but we can provide you with a suitable size you can find easily. Nonetheless, before we get to that point, let’s take a look at the different varieties of bathtubs.

1. The freestanding bathtub

You can easily recognize this as a bathtub. As the name goes, freestanding bathtubs are designed with freestanding units that have no attachment to the wall. Inflatable hot tubes also fall into this category. Most times, the tubs are positioned at the center of the bathroom since it perfects the true signature of opulence and luxury.

Since the tub is not placed close to the wall, it requires enough space, as to this effect, they are not suitable with small bathrooms.

The advantage of this tube is the ability to give more freedom since the entire shape is not measured out precisely. Once you have enough bathroom space, then no need to worry about the precise dimension.

Using a freestanding bathroom in a small center is often accompanied by detrimental effects. Doing this will only make your bathroom more cramped -and your movement will be limited.

2. Alcove bathtubs

This tub is designed to fit in as a standard home tub, even as there is no such thing as a standard tub. The tub is enclosed in three walls of alcove. Using the tube, you can carefully take out measurements of all the space in your bathroom; since three of its sides are placed directly to the wall, it has only one side facing out.

One of the significant benefits of this tub is that it is compactable with shower. The wall traps the water on each part of the shower, and the shower curtain will do the fourth job.

3. Drop-in bathtubs

Drops that are found in tubs are pretty similar to that of alcove bathtubs. The stack similarities are; both are made up of the bathtub shell and are covered with skirts or aprons. This means the sides of the tub are not finished.

The bathtub will appear more fitted when it is installed with an alcove, similar to the style in alcove bathtubs, or you installed directly against the walls of your bathroom. The name of the tub is crafted from its preconstructed frame; which most time complicate installation process when compared to other types of tubs.

4. Undermount bathtubs

The under-mount tub is pretty similar when compared to the drop-in tubs. This time, the stack difference here is; the tub is placed on a deck constructed from stones and tiles. The bathroom can be a strike of ornament in the setting of your bathroom. The downside to this tub is that most times, the installation process can be expensive.

5. Corner bathtubs

Just as the name goes “corner Bathtubs,” they are tubs installed within the corners of the bathroom. It has a large size that provides you with the needed comfort; we recommend this to folks who stay in the bathtub for a protracted period; i.e., they prefer a hot soak than a quick body clean.

Due to the space they occupy, the bathtub is recommended for large spacious bathrooms. So you can consider having one if the space in your bathroom can accommodate it.

6. Walk-in bathtubs

This type of bathtub is designed for those with less mobility. This time, the user will need to get in through the side. Bathing in the tub is done with a seated position. So the tub is a bit higher when compared to other models.

It is designed to reduced mobility. The user enters through a side door that closes before the bath is filled.

How to measure a bathtub to make a standard bathtub

As stated earlier, bathtubs have no standard sizes. However, below are some examples of measurements to look out for on any of the models you want, whether acrylic or fiberglass.

Freestanding bathtub size

The freestanding tub can be installed in the bathroom without been fixed to the wall; to this effect, the tub is designed in different sizes. Here are some of the possible size outcomes.

Small: 50 inches long x 24 inches wide x 24 inches high

Medium: 60 inches long x 30 inches wide x 30inches high

Large: 72 inches long x 32 inches wide x 30 inches high

An oval sharp is also a possibility in which a freestanding bathtub can be created. An oval shape will have a normal with the following dimensions:

Oval bathtub: 60 inches long x 42 inches wide x 24 inches high

Alcove bathtubs/drop-in bathtubs Size

The drop-in bathtub / Alcove bathtubs are built with an average size. However, the bathtub can most times come in different variations. And these can be within the following range:

Small: 50 inches long x 30 inches wide x 15 inches high

Medium: 60 inches long x 32 inches wide x 18 inches high

Large: 72 inches long x 32 inches wide x 20 inches high

Undermount bathtub size

The bathtub is designed in different sizes and styles, due to its range of varieties, it make a standard list. Although the bathtub can be mounted like the alcove due to its design. The sizes are as follows:

Small: 50 inches long x 30 inches wide x 15 inches high

Medium: 60 inches long x 32 inches wide x 18 inches high

Large: 72 inches long x 32 inches wide x 20 inches high

Corner bathtub size

This is also designed in different varieties, but it is quite easy to come across some average sizes that are used by most manufacturers. Since the tub can fit perfectly within bathroom corners, it has no width nor length. Designed in an irregular shape.

The most popular size of the bathtub are:

Small: 48 inches x 48 inches x 18 inches high

Medium: 60 inches x 60 inches x 20 inches high

Large: 72 inches x 72 inches x 20 inches high

Walk-in bathtub size

The walk-in bathtub is designed with much height than the normal bathtub and it meant to decrease mobility and have you take your bath will siting. Below is a list of some of its dimensions.

Small: 48 inches long x 28 inches wide x 38 inches high

Medium: 60 inches long x 30 inches wide x 38 inches high

Large: 60 inches long x 36 inches wide x 38 inches high

Measuring Your Space

Measurements are guidelines. Most times, manufacturers design bathtubs using different units of measurement or dimension. Though, the most important thing is to take out the right measurement of the space where the tub will be placed before carrying out a purchase.

Maybe you have a bathtub you want replaced; you will need to carry out the entire measurement with caution, to have an accurate and error-free dimension as well as for easy cleaning.

You might have an installed bathtub already if you do, then it’s possible to have some part of the tub hidden if this is similar to what you have at home, then you will need a less accurate measurement. This means you will need to estimate most of your measurements for accuracy.

To measure out the width of a bathtub, take the accurate measurement of the outer lip that is attached to the wall. Add some inches to make-up for those parts of the tub that is installed in the wall.

To get the right length, you will need to take measurements from one point of the wall to another, then add some inches to both ends. This will help account the parts that are installed on the wall.


We repeat this again “a bathtub has no standard size,” though there are sizes that are more preferred than others.

Bathtubs are designed with different ranges of sizes and shapes, similar to how the sizes of a bathroom vary. One of the aspects that govern the choices of a bathtub that will suit your bathroom is taking the right measurement and making a choice of the bathroom that is most suitable. This is necessary to have a bathtub that makes you feel extraordinary.


Q. 1: What is the standard size of a tub shower?

A. 60″ long 32″ wide is one of the most common standard dimensions.

Showers and bathtubs combos are designed with 30″ X 30″ X 72″ or 60″ X 36″ X 72″. Which covers 60″ basin length.

Q. 2: How are alcove tubs measured?

A. Take a proper measurement from right to left side of your bathtub if you have a standing bathtub. Now measure the middle of the bathtub; this involves taking the accurate scale of both edges apart. If you have a bathtub that is enclosed with alcove, take the distance starting from an alcove’s end to the other side.

Q. 3: How do I know if my tub is steel or cast iron?

A. Use your fingertips to touch the bathtub. If you observe a cool sensation and the material appears similar to a coffee cup made from ceramic, then the tub is probably made from steel or iron. Bathtubs that are made from fiberglass have a plastic appearance and are a bit warm when compare to tubs made from steel.

Q. 4: How much does it cost to remove and install a bathtub?

A. Normally, bathtub installation can cost $3,350, but it covers from $1052 to $5,654; it all depends on the quality, modification, and type needed, and a tub can range from $200 – $2,000.

Q. 5: What is the inside width of a standard bathtub?

Ans. The interior of a standard bathtub is 45-inch long, 22-inch wide, and up to 18.5-inch deep. The water capacity of this tub is up to 24 gallons when filled to the brim. Most people only use up to 16 gallons of water for a bath.

Q. 6: How big is a 2-person bathtub?

Ans. A medium-size bathtub for two people is at least 66.9-inch long, 33.5-inch wide, and 22-inch high. The largest medium-size tub you will find stretches at 70-inch with a 35.4-inch width and 22.5-inch height.

About the author

Kai Michel

Hello, this is Kai, addressing homeowners in need of some help with their home renovation projects. I’ve worked on numerous toilet repair projects over the years that incorporated a wide variety of tasks, from repair to renovation and maintenance. Besides acquiring a degree on the legal codes and procedures, I gathered vast insights into bathroom settings, toilets, showers, fittings, and other household appliances, fixtures, and components. This helps me guide my clients through their home improvement and interior development plans. Since maintenance is my area of expertise, I can assist people in all phases of the actual ‘improvement’ process. To get my messages even further, I contribute to this site through my blog posts. Check my content here for expert suggestions!

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