Bathtub Dimensions (Size Guide)

Here we share our bathtub dimensions size guide for alcove, drop-in, walk-in, corner, round, small, rough & freestanding tubs.
Beautiful master bathroom with freestanding tub and dual showers Bathrooms are multipurpose areas that are guaranteed to get heavy use. A well-laid out, streamlined, and attractive bathroom is an asset to any home. Whether you are creating a new bathroom from scratch or renovating an existing space, the lay out is one of the most important considerations.

However, bathrooms are generally the smallest room the house. Cramming in a toilet, sink, shower or bathtub with appropriate storage, clearance, and ventilation is not an easy job. When the further complication of plumbing is added, it’s no wonder they are so difficult to get right.

The largest portion of your bathroom footprint will be devoted to your bathtub. In order to plan the space appropriately and avoid problems down the line, it is important to know the dimensions of popular bathtub styles.

Standard Bathtub Dimensions

This article addresses the most common sizes for different styles of bathtubs. However, a word of warning: standardization only goes so far. There are no laws or regulations governing bathtub sizes.

You should never choose a tub without consulting the manufacturer’s specifications, and measuring your space (at least twice!) to ensure that the bathtub you invest in will be easy to install.

Alcove Bathtub Dimensions

Bathroom with alcove tub An alcove bathtub is usually incorporated with a shower. It is surrounded on three sides by walls, with the showerhead and tap in the same wall. Most often, an alcove bathtub uses a shower curtain rather than a door. Standard for a reason, they are cost-effective and can be used for a variety of purposes.

They generally measure 60 inches long and are 30 to 32 inches wide. The depth is less standard — anywhere between 14 and 20 inches.

Bathtub Rough In Dimensions

Bathroom under construction with tub ‘Rough in’ is a phase of construction. During this phase, all the connections are laid out in the house, including electrical, mechanical, and of course, plumbing.

Getting this right is a crucial step to a successful construction project — if done well, installation of hardware and finishes will go in easily.

The placement of the holes for pipes needs to line up with the tap for the bathtub. The standard placement for the faucet valves is 20 to 22 inches above the floor.

Each faucet should generally be 4 inches to the right and left of the centerline (an imaginary vertical line extending up from the center of the drain.)

The tub spout should be placed 4 inches above the rim of the tub. Of course, while these measurements are the most common, any bathtub could have different requirements. It is important to check the specification of the particular model being installed.

You can use one of the many types of bathroom remodel software programs to create and visualize your design to ensure it fits perfectly in your home’s layout.

Freestanding Bathtub Dimensions

Freestanding bathtub with double door walk-in shower The most important feature of a freestanding bathtub is that it’s not attached to any wall. The plumbing is connected directly through the floor. They are elegant and attractive, as well as being easy to maneuver around.

The smallest size freestanding bathtubs are generally 55 inches long, 27 inches wide, and 15 inches deep. An average-sized freestanding bathtub is similar to an alcove bathtub — about 60 inches long, 30 inches wide, and 19 inches deep.

Larger freestanding bathtubs can be longer than the average adult, starting at 72 inches long, or a whopping 6 feet! Their width is usually a larger size, such as 32 inches, and the depth is generally 20 inches.

Small Bathtub Dimensions

Small alcove tub with shower The smallest available alcove bathtub is 54 inches long, 30 inches wide, and 15 inches. This is a great option if you need to bathe small children or animals.

For all but the shortest adults, this bathtub will be frustrating to bathe in. Many adults are already used to choosing between submerging their legs or torsos in the bath. With the smallest sizes of alcove bathtubs, neither is possible.

Corner tub Corner Bathtub Dimensions

Corner bathtubs are most often seen in master bathrooms. They are intended for long, luxurious soaks. They are often square or somewhat triangular in shape.

A small corner bathtub would likely measure 4 feet by 4 feet (48×48”.)

An average corner bathtub is generally five feet by five feet (60×60”) with a depth of 20″.

A larger-sized corner bathtub would measure six feet by six feet. (72×72”).

Round tub with hammered copper Round Bathtub Dimensions (Japanese Style)

An unusual choice for a bathroom, at least outside of Japan, is a round bathtub. They go by several names: soaking tubs, Japanese bathtubs, or, in the original Japanese, ofuro. These are usually free-standing, but not always.

A round bathtub usually does not include a shower. They can be made of wood or ceramic. A typical size for a one-person tub would be 48 inches in diameter, and 30 inches deep. This allows for a much deeper soak than a traditional bathtub.

Tubs appropriate for two people are also available, but they become oval in shape — 65 inches long, and 30 inches wide at the largest part — while still retaining a depth of 30 inches.

Drop-in Bathtub Dimensions

Drop in bathtub To create a drop-in bathtub, a deck is built, and a simple bathtub (with no sides or supports built in), is placed inside it. Then, the deck is covered with tile.

It’s standard procedure to leave at least 6 inches of completely flat space all around the tub. This means you must carefully plan for the additional space around the rim. This style is very striking and luxurious when paired with a large two-person tub.

The length of a larger tub can be between 45 and 72 inches, plus an additional foot for the deck. The width is usually between 30 and 32 inches with, again, an extra foot of deck added for installation calculations. The height is the same as that of a standard bathtub, 14 to 20 inches.

Walk in bathtub Walk-in Bathtub Dimensions

If you are renovating or building a bathroom and want it to be accessible to people with mobility difficulties, you may be considering a walk-in bathtub.

These tubs are constructed with a door in the side, so the user can enter and exit without raising their leg over a tall rim.

A walk-in tub is typically from 51″ to 60″ in length by 28″ to 32″ wide and around 39″ to 40″ in height. You can find smaller units, however they may pose issues with comfort, entry and exiting. There are smaller squarish shaped walk-in tubs that measure 31.5″ wide 37.5″ in length and 38.5″ in height.

The main difference in size is depth. Where the average bathtub has a depth of 14-20 inches, a walk-in bathtub is closer to 30 inches on average.

Measure twice, cut once, and before you know it you’ll be enjoying a long soak in your perfect bathtub. Enjoy! For more related content visit our guide on how to choose a bathtub.


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Written by Ellen - Architect, Design Consultant

Ellen Siloy is a passionate designer with a Bachelors in Architecture from Saint Louis University. She has extensive experience writing about interior design and green architecture projects. As an architect she is also skilled in the use of Revit, Skethup and CAD software. She is a certified LEED Green Associate and has worked as a LEED Coordinator for LEED Certification of Buildings.

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