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Whether you're upgrading your bathroom or choosing a new tub for a home renovation, understanding how long a bathtub is, along with its width, depth, and design variations, is essential. Many assume bathtubs follow one fixed size, but in reality, they come in a wide range of configurations. From standard tub dimensions to soaking tub measurements, each design serves different needs and spaces.
In this guide, you'll find everything you need to know about bathtub sizes, including:
Explore our full range of bathtubs , from compact options to deep soaking tubs and designer freestanding models crafted for modern spaces.
The most common standard size bathtub measurements in the U.S. are:
This typical size applies to most alcove bathtubs, which are installed into a three-wall enclosure. These typical tub dimensions make them ideal for medium-sized bathrooms and bathtub-shower combinations.
Looking for deeper comfort? See Standard Bathtub Size for a complete breakdown of what dimensions mean in real-world use.
Most homeowners ask: What is the length of a standard bathtub?
Here’s a breakdown:
A 66 inch bathtub provides a generous soak for taller users and couples. See our Extra-Large Bathtubs Redefined post for top picks in extended sizes.
Width and height can impact comfort, water depth, and room layout:
When choosing a tub, don’t overlook the depth of a standard bathtub, as deeper models offer full-body immersion for enhanced relaxation.
To better understand how big a standard tub is compared to other designs, here’s a comprehensive comparison of common bathtub dimensions:
| Bathtub Type | Length (in) | Width (in) | Height (in) |
|---|---|---|---|
| Alcove | 54–60 | 30–32 | 14–16 |
| Drop-In | 45–72 | 30–32 | 14–20 |
| Freestanding | 55–72 | 27–32 | 15–20 |
| Soaking Tub | 60–72 | 30–40 | 20–24 |
| Corner | 60×60 | — | 20–22 |
| Walk-In | 48–60 | 28–36 | 30–38 |
| Tub-Shower Combo | 60–72 | 30–36 | 14–20 |
Still unsure which one fits your needs? Browse Aquatica’s interactive buying guide to match your bathroom size with the right tub dimensions.
The most traditional type, alcove tubs are efficient, space-saving, and easy to pair with a shower. Common measurements:
Best for: Smaller bathrooms, guest baths, or renovations where space is limited.
Discover tips in
A Shower Bathtub Combo for the Perfect Space Saver
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Installed inside a custom-built deck, drop-in tubs offer flexibility in design and layout:
These tubs require more floor space but offer a luxurious aesthetic. Choose a composite bathtub for optimal durability and style.
Often the centerpiece of a luxury bathroom, freestanding bathtubs come in a variety of shapes and lengths:
Many are also deep soaking tubs, offering 15–20 inches of water depth. Learn more about style and layout in The Ultimate Guide to Freestanding Bathtubs .
A soaking tub is designed for deeper, more immersive bathing. These tubs typically measure:
Some Japanese soaking tubs are more compact in length (as short as 40 inches) but offer increased depth, making them ideal for sitting immersion rather than reclining.
Aquatica’s True Ofuro Series exemplifies this concept with space-efficient Japanese bathtubs that provide luxurious depth in compact form.
Depth matters when it comes to comfort. A good soaking tub should have:
Explore the Aquatica PureScape Relax Air Massage Bathtub for spa-grade depth and hydrotherapy in one.
| Feature | Standard Bathtub | Soaking Tub |
|---|---|---|
| Average Depth | 14–16 inches | 20–24 inches |
| Length Range | 60 inches (typical) | 60–72 inches |
| Water Capacity | 40–60 gallons | 80–120 gallons |
| Immersion Level | Partial body | Full-body, shoulder-deep |
| Comfort | Basic | Luxurious, spa-like |
Want the benefits of deep soaking without the space requirements? View our collection of extra deep bathtubs .
Not every bathroom has space for a 72-inch tub. For small bathroom designs, the following compact bathtub sizes are popular:
Many models in this range offer full functionality while saving floor space. Aquatica specializes in compact luxury, as highlighted in 5 Reasons to Choose Small Freestanding Bathtubs .
The smallest bathtub dimensions typically found on the market include:
These tubs, including sitting bathtubs and Japanese-style soakers, are ideal for powder rooms or guest baths. Check out our Mini Bathtubs for Cozy Bathrooms for inspiration.
If you're short on space but don’t want to compromise on comfort, our Space-Efficient Bathtub Solutions are crafted just for that.
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Freestanding tubs vary more than any other category. Their freedom of placement and aesthetic appeal make them a favorite in modern homes. Standard sizing includes:
Aquatica offers rectangular , oval , and round freestanding tubs to suit any design language.
While stunning, freestanding bathtubs need proper planning:
Need layout inspiration? Explore Freestanding Bathtubs – Pick the Perfect Shape for visual guidance.
Aquatica’s best-selling freestanding tubs in 2025 include:
Not sure how to choose? Read our expert guide on How to Choose the Right Freestanding Bathtub .
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One of the most common questions homeowners ask when researching bathtub sizes is:
How many gallons is a regular bathtub?
Here’s a general guideline:
Aquatica’s hydromassage bathtubs and air-jetted tubs can hold significantly more water for a spa-grade experience, often ranging between 100 and 120 gallons.
| Bathtub Type | Gallon Capacity |
|---|---|
| Alcove | 40–60 gallons |
| Drop-In | 40–60 gallons |
| Freestanding | 50–80 gallons |
| Soaking | 90–120 gallons |
| Corner | 80–110 gallons |
| Walk-In | 50–80 gallons |
| Tub-Shower Combo | 40–60 gallons |
To avoid energy waste, ensure your water heater can handle the volume. A 50-gallon heater may not suffice for deeper tubs. Consider on-demand water heating systems for larger baths.
Technically, bathtubs are not measured by square footage like flooring, but understanding the footprint can help during planning. Here’s an estimate:
Add clearance space (24–30 inches) in front of the tub to allow for easy entry and cleaning. This is essential for walk-in tubs and for families with children or seniors.
Depth affects water use, immersion, and overall comfort. Here’s how to weigh your options:
Explore the benefits of deeper tubs in Shallow Bathtubs, Big Comfort, Less Water and compare usage costs and immersion levels.
Before selecting a tub, measure:
Smaller rooms benefit from models like the True Ofuro Mini , designed specifically for compact layouts.
Key plumbing aspects to consider:
If switching from an alcove to a freestanding model, review How to Choose the Right Bathtub for advice on rerouting plumbing lines.
Heavier materials like stone resin, cast iron, or natural stone require:
Lightweight alternatives like acrylic bathtubs offer flexibility with easier setup and still come in a wide range of dimensions. See Why Choose an Acrylic Bathtub for guidance on durability vs. weight.
The average bathtub soak lasts 15–30 minutes. If you’re using a deep soaking tub, be sure your heater can maintain hot water for at least 20–25 minutes. For optimal relaxation, consider Aquatica’s bathtub therapy systems .
A standard tub is:
These dimensions work for most homes and can be combined with showerheads in tub-shower combos.
A 1.75 bath refers to a layout with:
This layout impacts renovation scope, but typically doesn't affect the size of your primary tub.
No. From corner bathtubs to walk-in models , dimensions and depth vary widely. That’s why Aquatica offers custom-fit bathtubs, designed for your room, needs, and comfort.
It depends on your layout. If your bathroom can accommodate 66 inches in length without compromising clearance or plumbing access, then yes. Otherwise, explore small freestanding bathtubs or Japanese soaking tubs for compact alternatives.
While a real image infographic works best visually, here’s a quick-reference text-based breakdown of bathtub shapes and sizes:
Standard Bathtub (Alcove Style):
Freestanding Bathtub:
Soaking Tub:
Corner Bathtub:
Walk-In Bathtub:
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Whether you live in a city apartment or a countryside estate, here’s how to select the best bathtub size and type for your lifestyle:
Don’t just ask how big is a standard tub? Ask how you want to feel in it. Will you be taking short functional baths, or long relaxing soaks? A 60-inch alcove tub may suffice for families, but solo bathers seeking deeper immersion should consider a 66–72 inch soaking model.
Learn how bathing habits inform tub selection in Experience Deep Relaxation in a Bathtub .
Larger tubs mean more water and energy. If sustainability or cost is a concern, opt for shallow soaking tubs that provide full immersion with less volume.
A quality bathtub improves both comfort and home value. Designer tubs like the Aquatica Stone Bathtubs or Solid Surface Series offer timeless appeal and superior durability.
Learn more in How a Luxury Bathtub Can Increase Your Property’s Worth .
To recap:
Ready to find your perfect fit? Browse Aquatica’s diverse bathtub collections and take the guesswork out of your next renovation.
Have questions? Contact our expert team or dive into the knowledge-rich Aquatica bathtub blog for product deep-dives, design tips, and installation advice.
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