What Are Standard Bathtub Sizes?

When planning a bathroom renovation or installing a new tub, understanding standard bathtub sizes is essential to ensure the perfect fit and function. Whether you’re upgrading an old tub or designing a custom bathroom, selecting the right size can enhance comfort, maximize space, and create a more aesthetically pleasing environment. In this guide, we’ll walk you through the most common bathtub sizes, how to measure for your new tub, and what factors to consider when choosing the right one for your bathroom.

Why is Bathtub Size Important?

The size of your bathtub plays a crucial role in both the functionality and the overall design of your bathroom. A bathtub that’s too small can leave you feeling cramped and uncomfortable, while a bathtub that’s too large can dominate the space and disrupt the flow of the room. A properly sized bathtub ensures:

• Comfort: A well-sized bathtub gives you ample space to relax and stretch out, making it easier to enjoy a soothing bath.
• Space Efficiency: Selecting the right size ensures that the tub fits perfectly into your bathroom layout, maximizing available space without overcrowding the room.
• Functionality: The correct size also ensures that the tub meets your bathing needs, whether you’re looking for a deep soaking experience or a family-friendly option.

What Are the Standard Bathtub Sizes?

Bathtubs come in a variety of styles, each with its own standard size range. The size you choose will depend on your bathroom layout, your specific needs, and the type of tub you prefer. Here are the most common bathtub sizes to consider:

1. Alcove Bathtubs (Standard Built-In Tubs)

Alcove bathtubs are the most common type of bathtub, found in many traditional and modern bathrooms. These tubs are installed between three walls, making them ideal for smaller spaces where maximizing space is essential. Standard sizes for alcove bathtubs include:

• Length: Typically 150 cm to 180 cm (60 inches to 72 inches).
• Width: Commonly 71 cm to 76 cm (28 inches to 30 inches).
• Depth: The depth usually ranges from 38 cm to 46 cm (15 inches to 18 inches), although some models may be deeper for a more comfortable soaking experience.

Alcove tubs are usually the go-to choice for standard bathroom layouts because they make efficient use of space and can accommodate a shower above, creating a versatile bathing solution.

2. Freestanding Bathtubs

Freestanding bathtubs are a luxurious option that adds a stylish and elegant look to larger bathrooms. Unlike alcove tubs, these tubs don’t rely on walls for support and can be placed anywhere in the room. Common sizes for freestanding tubs include:

• Length: Ranges from 150 cm to 180 cm (59 inches to 71 inches), but some models can go up to 213 cm (84 inches) for a more spacious option.
• Width: Typically between 71 cm and 91 cm (28 inches to 36 inches).
• Depth: Freestanding tubs tend to be deeper, with a range of 41 cm to 51 cm (16 inches to 20 inches) for a luxurious soaking experience.

Freestanding tubs are often chosen for their visual appeal, and they work well in larger bathrooms where space is not an issue. They come in various shapes and materials, from sleek modern designs to classic clawfoot styles.

3. Drop-In Bathtubs

Drop-in bathtubs are installed in a custom-built deck or platform, with the sides of the tub sitting within the surrounding structure. These tubs offer a seamless look and are often used in custom bathroom designs. Standard sizes for drop-in tubs are:

• Length: Typically 150 cm to 180 cm (60 inches to 72 inches).
• Width: The most common width is 71 cm to 76 cm (28 inches to 30 inches).
• Depth: Drop-in tubs have a depth range of 41 cm to 51 cm (16 inches to 20 inches), but deeper models are also available.

Drop-in tubs are perfect for creating a high-end, custom look in larger bathrooms. Their versatility allows them to fit a variety of bathroom styles, from contemporary to traditional.

4. Soaking Bathtubs

Soaking tubs are designed for a deeper bath experience, allowing you to submerge your body fully in the water. These tubs are ideal for those who prefer a relaxing, immersive soak. The standard sizes for soaking tubs include:

• Length: Usually 150 cm to 180 cm (60 inches to 72 inches).
• Width: Typically 70 cm to 90 cm (28 inches to 36 inches).
• Depth: The depth of soaking tubs is deeper than standard tubs, typically ranging from 46 cm to 61 cm (18 inches to 24 inches) or even deeper for extra immersion.

Soaking tubs are an excellent choice for those who want a spa-like experience at home. The increased depth allows for a more relaxing soak, making them a popular option in modern bathroom designs.

5. Corner Bathtubs

Corner bathtubs are designed to fit neatly into the corner of your bathroom, making them a great space-saving option. These tubs are usually triangular or asymmetrical in shape and provide a more spacious bathing experience. Standard sizes for corner tubs include:

• Length: Usually 150 cm to 180 cm (60 inches to 72 inches).
• Width: Typically 122 cm to 137 cm (48 inches to 54 inches) depending on the model.
• Depth: The depth usually ranges from 41 cm to 51 cm (16 inches to 20 inches).

Corner tubs are great for maximizing the use of corner space in a bathroom while still providing a comfortable and spacious bathing experience.

6. Japanese Soaking Tubs (Ofuro)

Japanese soaking tubs, or ofuro, are designed for deep soaking rather than long stretches. These tubs are typically smaller in length but much deeper than standard tubs, allowing you to sit in a more upright position for a full-body soak. Standard sizes for Japanese tubs are:

• Length: Typically 122 cm to 152 cm (48 inches to 60 inches).
• Width: 71 cm to 76 cm (28 inches to 30 inches).
• Depth: These tubs are much deeper, usually ranging from 61 cm to 76 cm (24 inches to 30 inches).

Japanese tubs are perfect for those who want a more meditative, deeply relaxing bath experience and are a great option for smaller bathrooms due to their compact size.

How to Measure for a Bathtub

To ensure your bathtub fits perfectly in your bathroom, it’s crucial to take accurate measurements. Here’s how to measure for a bathtub:

1. Measure the Length: Measure the available space for the tub, considering any obstructions such as plumbing or fixtures. For alcove tubs, measure from one wall to the other, and for freestanding or drop-in tubs, measure the space where the tub will sit.
2. Measure the Width: Ensure there’s enough space around the tub for movement. For alcove and drop-in tubs, measure the width of the space from wall to wall.
3. Measure the Depth: For soaking or freestanding tubs, measure from the floor to the ceiling to ensure there’s enough height for the tub’s depth.
4. Consider Clearance: Allow for proper space around the tub for plumbing, faucets, and any additional accessories such as shower heads or towel bars.

Key Takeaway: Standard bathtub sizes typically range from 150 cm to 180 cm (60 inches to 72 inches) in length and 70 cm to 90 cm (28 inches to 36 inches) in width, with depths ranging from 38 cm to 60 cm (15 inches to 24 inches) depending on the type. Accurate measurements are essential when selecting a bathtub to ensure a perfect fit for your bathroom. Whether you choose an alcove, freestanding, soaking, or corner tub, the right size will enhance comfort, maximize space, and elevate the overall design of your bathroom.