Guide to Choosing the Size of a 2-Person Bathtub

Although most people opt for 1-person bathtubs when bathing, those who are seeking a romantic experience or looking to turn their bathtub into a water playground may consider a 2-person bathtub. It’s evident that adding another person means needing more space, so what size of bathtub is more suitable for a double soak? This guide from Giving Tree Home will help you out!

How to Choose the Size of a 2-Person Bathtub

As a three-dimensional object, the size of a bathtub is a broad concept, encompassing the length, width, and height of its top, bottom, and interior. When considering the purchase of a 2 person bathtub, the most critical parameters are the opening length, basin size, and soaking depth. Let’s start with these basic concepts:

  • Opening Length

    Opening Length

    The opening length refers to the maximum length at the top of the bathtub, which is the most focused part when choosing a bathtub. Retailers usually mark this size in the product title, such as “71-Inch Oval Solid Surface Bathtub.” The opening length directly affects the bathtub's footprint, interior space, and the comfort of the backrest design.

  • Basin Size

    Basin Size

    The basin size refers to the inner dimensions of the bottom of the bathtub, which is often the most overlooked part by users. The basin size determines the legroom inside the bathtub, especially important for taller users. After all, no one wants to curl up while taking a bath.

  • Soaking Depth

    Soaking Depth

    Soaking depth is the vertical distance from the water surface to the bottom of the bathtub after it is filled with water. It’s important to note that, to prevent water from overflowing onto the floor, bathtubs usually have an overflow outlet, so the soaking depth should be calculated as the overall internal height minus the distance from the top to the overflow outlet.

When choosing the size of a 2 person bathtub, it’s necessary to consider all three of these factors, not just a single dimension. For example, to ensure aesthetics, designers often use a trapezoidal structure, meaning the top of the bathtub is larger than the bottom basin size. While this design looks elegant, if the backrest is straight instead of curved, it may make it difficult for the user to stretch out comfortably when used for a double soak.

Bathtub back curvature comparison

So, does that mean a bathtub with a smaller top size and a larger basin size is suitable? Clearly not. Imagine a bathtub with a small top size and a large basin size—this design would completely violate ergonomic principles. A design where the top and basin sizes are the same isn’t ideal either, as this would result in a 90° angle, forcing you to sit up straight during your bath, which is very uncomfortable. If you want to understand why this design is not recommended, consider reading "How to Choose the Bathtub Inclination Angle".

Choosing the soaking depth is relatively easier to understand. Generally, with other conditions being equal, the greater the soaking depth, the larger the water capacity of the bathtub. However, when another person is added to the bathtub, the water volume will decrease since the body occupies space inside the tub.

Therefore, an ideal 2 person bathtub should have a large opening length, suitable basin size, and sufficient soaking depth, with the backrest featuring a certain incline. The opening length should ideally be no less than 65 inches, the basin size should be at least 40 inches, the backrest angle should be approximately 110 degrees, and the soaking depth should be no less than 13 inches.

If you’re unsure, here are four recommended bathtub models that not only meet your requirements for a double soak but also feature ergonomic designs that allow you and your partner to enjoy a more comfortable bathing environment!

Key Considerations for Different Types of 2-Person Bathtubs

Black and white freestanding 2-Person Bathtub

Freestanding Bathtub

The standard dimensions for a 2-person bathtub mentioned above are specifically designed for freestanding bathtubs. These bathtubs do not require being built into a wall or custom platform; instead, they are designed as a standalone unit, fully exposed on all sides, making them highly decorative. Choosing a freestanding bathtub as a double bathtub option not only allows it to become the focal point of the bathroom but also enhances the overall aesthetic and functionality of the space. Its simple and streamlined design perfectly complements modern bathroom styles, fulfilling functional needs while boosting the bathroom's sense of fashion.

Whirlpool 2-Person LED Tub with Left Drain

Whirlpool Tubs and Hot Tubs

Whirlpool tubs are similar to standard bathtubs, intended for daily relaxation, but they offer a comforting massage experience through water jet streams, typically used indoors. 2-person whirlpool tubs are usually designed with side-by-side seating and comfortable backrests, so there’s no need to overly focus on internal dimensions. What's important is ensuring that your bathroom has enough space to accommodate this large fixture, as whirlpool tubs generally occupy a significant area.

Similarly, hot tubs also provide jet massage functions but go a step further by offering heating capabilities. This feature makes hot tubs suitable not only for home bathing but also often serves as a social hub, especially in outdoor settings. 2-person hot tubs are a common choice, but some models can even accommodate more than 10 people, catering to larger social gatherings.

White cast iron clawfoot bathtub for two

Clawfoot Bathtubs

Clawfoot bathtubs are a classic variation of the freestanding bathtub, distinguished by the four feet that support the tub from the bottom. When choosing a clawfoot bathtub as a 2-person bathtub, the size considerations are similar to those for freestanding bathtubs. However, it's important to note that the weight of a clawfoot bathtub is concentrated on four support points, and the total weight significantly increases when used by two people. If the floor's load-bearing capacity is insufficient, it could pose a safety hazard. Therefore, before deciding to install a 2-person clawfoot bathtub, ensure that the floor has been properly reinforced to avoid any potential risks.

Ending

When considering the size of a 2-person bathtub, you should always consider the opening length, basin size and soaking depth together rather than just one aspect. However, Giving Tree Home understands that some people purchase 2-person bathtubs because they are tall or slightly fat. If this is the case, consider a large-sized bathtub. If you still have questions about the size of a 2-person bathtub after reading this article, you can contact our customer service at any time and we will answer all your questions in detail!

Back to News

More Ideas

View all