How to Choose Mattress Thickness

Part of choosing the perfect mattress is considering how thick should a mattress be. The mattress thickness contributes to your comfort level at bedtime. Purchasing a thin mattress may cause premature sagging and contribute to poor sleep.

It is recommended sleepers choose a bed at least 10 to 14 inches thick. However, there are many factors like body type and sleep position that may require an even thicker mattress.

In this article, we’ll discuss what you should consider when looking for a thick mattress. Also, we’ll break down what affects the thickness of your mattress.

Types of Mattress Thickness (By Category)

Considering we spend nearly a third of our lives asleep, choosing a mattress that supports comfort, durability, and proper spinal alignment is essential.

Mattresses vary in thickness to meet a range of needs and preferences, allowing you to select the right balance of support and comfort. When deciding on the best option for you, think about factors such as your preferred bed height, mobility requirements, body weight, and sleep position.

If you share your bed, take into account your partner’s needs to ensure both of you enjoy a restful night’s sleepWhat Affects Mattress Thickness?

Before you choose your new bed, you’ll need to know what contributes to the depth of your mattress. Most mattresses have two or more layers inside of them, specifically designed to provide support for sleepers. Let’s look at the two basic layers found in all mattresses: the comfort layer and the base layer.

Perfect Mattress Thickness

Ideally, a durable and comfy mattress thickness should be at least 8 to 14 inches thick. You’ll also want to meet the minimum requirement of a  2 to 3-inch thick comfort layer and 5 to 6-inch base layer. However, there are other factors to consider before you choose your new bed.

Comfort Layer

The comfort layers are the soft top layer of your mattress. These layers are the closest to your body when you’re asleep and relieve pressure, which is why they feel so plush. Comfort layers are made with cotton, wool or poly-foam, to contour to the curves of your body. They also are effective in isolating motion transfer, which can be especially good for couples.

Some luxury beds may have more than one comfort layer to provide sleepers with cooling technologies or targeted back support. These additional layers may contribute to the overall depth of your mattress. They may even be 3 to 4 inches thick. However, the majority of  comfort layers have a mattress thickness of 2 to 3 inches thick.

Underneath the comfort layer of your mattress lies the transition layers. The transition layer acts as an insulator by providing a buffer between the soft top layers and firm core layers. Most beds have insulator/transition layers made of high-density poly-foam, latex, or wool.

Depending on how the mattress is constructed, this layer is zoned to offer more comfort to sensitive regions of your body, such as the head, shoulders, back, hips, and feet.

Base Layer

The base layer or support layer is the foundation of your mattress and is usually made from poly-foam, latex, or pocketed springs. This layer should make up at least 50 percent of your mattress thickness.

Typically, mattresses with a thick base layer tend to be more durable, while thinner ones may be prone to sagging. So if your bed has a depth of 14 inches, you should make sure the base layer is 6 to 7 inches thick.

What to Consider When Choosing Mattress Thickness

a. Sleeping Position

Your sleeping position affects how comfortable you will feel on a mattress. Certain sleeping positions, like side sleep, require extra cushioning for individuals to stay comfy.

On the other hand, you may need support for sensitive regions of the body, like your back and hips. Choosing a comfortable mattress with a specific thickness can help cater to your sleep needs.

• Side Sleepers: Mattresses for side sleepers should be 12 to 14 inches thick. They also require soft cushioning to reduce the pressure on the shoulders and hips. Thick beds with extra-plush comfort layers provide pressure point relief and prevent muscle aches and pains during sleep.
• Back Sleepers: Beds for back sleepers are typically firm 10 to 12-inch. If you are a back sleeper, you’ll require support for your shoulders and buttocks. A firm mattress can keep your spine properly aligned.
• Stomach Sleepers: The best mattresses for stomach sleepers are 10-inch thick to reduce the chances of spinal misalignment. We do not recommend stomach sleeping, but thinner comfort layers will provide a firmer surface to support your abdomen and ease the strain on your back.
• Combination Sleepers: Combination sleepers switch between 2 to 3 positions throughout the night and need a medium-feel mattress to accommodate all positions. Mattresses for combination sleepers should be at least 12 inches thick with a medium feel to provide the sleeper with the perfect balance of firmness and softness.

b. Body Type

Adding too much pressure to your mattress can cause permanent damage to your bed and can negatively affect your sleep. To avoid having to replace your mattress earlier than you planned, you need to determine how your mattress responds to your body weight.

• Lightweight Sleepers (weighing less than 130 pounds): Mattresses for petite sleepers should be soft and at least 12 inches or thicker. These beds have ultra-thick comfort layers to relieve pressure points and conform to their bodies, reducing joint pain.
• Average Weight Sleepers (weighing between 130 to 230 pounds): Average sleepers usually sleep best on medium-firm mattresses with a depth of 10 to 12 inches. However, this all depends on your preferred sleeping position. Side-sleepers may require a softer sleeping surface. It’s best to check the material used in the comfort layers so you can understand how they will affect the feel of the bed.
• Plus-Size Sleepers (weighing above 230 pounds): Beds for plus-size sleepers should choose a bed 12 to 14 inches thick. Try to pick mattresses with comfort layers that are at least 6 inches as well.  You’ll also want a base layer at least 7 to 8 inches thick. Sometimes thicker layers provide extra cushioning for sleepers and prevent premature sagging.

Are You Sharing a Bed?

Sharing a new bed with a partner will add more pressure onto your mattress than if you were sleeping alone.

Putting extra pressure on a thin mattress will cause it to sag and may impact your sleep. So, if you’re sharing your bed, it should be at least 10-12 inches thick.

1. Health-Focused Mattress Choices 

The right mattress thickness plays a crucial role in optimizing comfort, especially for individuals with health concerns like back pain, arthritis, or mobility issues.

Selecting an appropriate thickness can significantly impact sleep quality by promoting comfort, support, and pressure relief.

• Chronic Back Pain: For individuals with ongoing back pain, a mattress between 10-14 inches thick is often recommended. This thickness allows for additional layers that provide enhanced support and contouring. Memory foam or hybrid mattresses within this range can help maintain spinal alignment, cradling the body to reduce pressure points and alleviate pain.
• Arthritis and Joint Sensitivity: People with arthritis benefit from a thicker mattress with multiple layers for balanced weight distribution. This cushioning effect can be particularly advantageous for side sleepers, reducing pressure on sensitive areas like the hips and shoulders.
• Mobility Limitations: For those with mobility challenges, thinner mattresses between 8-10 inches in thickness may be preferable. Thinner mattresses allow easier access, making it simpler to get in and out of bed without unnecessary strain.

2. Mattress Type and Thickness

Each mattress type has its own unique construction, affecting both thickness and performance. Factors such as material composition, support systems, and comfort layers contribute to an optimal thickness suited to your personal needs and preferences.

• Memory Foam Mattresses (8-14 inches): Memory foam mattresses provide varying thicknesses, typically between 8-14 inches. Thicker memory foam options (12+ inches) cater well to side or heavier sleepers, offering deeper contouring and pressure relief. Meanwhile, thinner memory foam options often suit back and stomach sleepers, who generally prefer firmer surfaces that prevent excessive sinking.
• Innerspring Mattresses (8-12 inches): Innerspring mattresses rely on coil systems, offering solid support without needing extra thickness. They are generally between 8-12 inches, with thicker options available for those who desire a plush surface through added comfort layers.
• Hybrid Mattresses (10-16 inches): Hybrid mattresses blend the support of innerspring coils with comfort layers made from foam or latex. Usually ranging between 10-16 inches, hybrid options are thicker to accommodate multiple layers, providing a well-balanced mix of support and comfort for diverse body types and sleeping styles.
• Latex Mattresses (9-12 inches): Latex is resilient and supportive even at thinner profiles, generally between 9-12 inches. With a naturally buoyant feel, latex mattresses offer a firm yet comfortable surface. A thinner latex mattress can still deliver robust support, ideal for back and stomach sleepers.

3. Bed Frame Compatibility 

The type of bed frame you choose can significantly influence the best mattress thickness for both support and aesthetic appeal.

• Platform Beds: Platform beds are low-profile and typically do not require a box spring. Thicker mattresses (10-14 inches) work well on platform beds, providing ample height and support without a box spring. A thinner mattress may not offer sufficient support and could feel too low on a platform base.
• Adjustable Bases: Mattresses with an 8-12 inch thickness range are generally ideal for adjustable bases. This allows the mattress to bend and conform easily to the base’s movements. Thicker mattresses might be too stiff and may hinder the adjustable base’s flexibility.
• Slatted Frames: Slatted bed frames require a mattress thick enough to prevent sagging between the slats. A mattress thicker than 10 inches is recommended to avoid dips and maintain consistent support, while thinner mattresses may lack the structure needed for slatted frames.

4. Longevity and Durability

Thicker mattresses tend to offer longer-lasting durability than their thinner counterparts, as the multiple layers help to distribute weight and wear more evenly over time. If longevity is a priority, choosing a thicker mattress (at least 10 inches) can be a sound investment.

• Enhanced Lifespan: Mattresses with multi-layer construction (10 inches or thicker) better resist sagging and indentation. The extra layers not only provide added comfort but also absorb pressure effectively, extending the mattress’s lifespan.
• Durability of Thinner Options: Thinner mattresses, though not as durable as thicker options, can still perform well if crafted from high-quality materials. However, they may wear out sooner as they lack the added layers that disperse body weight more evenly, making them more prone to sagging.

5. Height of Your Foundation

You’ll want to combine the mattress thickness and a deep or extra tall mattress foundation to ensure your bed will still be accessible. When your bed is too high, it’s harder to climb in and out of bed each night.

We suggest keeping your mattress at least 25 inches from the ground. This will allow you to access your bed easily throughout the night. Keeping your thick mattress elevated also minimizes its exposure to dust and other allergens, though you may still want to look into a mattress protector if you want to avoid triggering allergy symptoms.

There’s also toppers to consider, as a mattress topper will raise the height of your bed by 2 to 4 inches, usually. Many sleepers won’t bother pairing a mattress topper with a new mattress, as ideally the surface shouldn’t need any extra help to feel comfortable.

However, if you plan on pairing something like a cooling mattress topper with your new mattress, you will also need to account for the topper’s thickness when it comes to your bed’s total height.

SEE ALSO: Best Hypoallergenic Mattresses for Allergies

6. Mobility Issues

If you are experiencing difficulty getting into bed, search for a mattress thickness under 14 inches. Going beyond a 14-inch mattress is not recommended for individuals with mobility issues since struggling to get in bed could worsen medical conditions. The ideal bed height makes it easier to move in and out of bed, minimizing the risk of falls.

Sleepers with arthritis, shoulder pain, or hip pain should use mattresses 12 to 14 inches thick. These thick mattresses tend to be softer and contain enhanced cushioning to relieve pressure.

Advantages and Disadvantages of Thick Mattresses

Investing in a thicker mattress provides sleepers with more cushioning and offers an ultra-plush sleeping surface. Thin mattresses are not the best choice for couples since they can’t withstand the weight of two adults. This can make bedtime extremely uncomfortable and may cause permanent damage to your mattress due to sagging.

Though a thick 14 inch mattress or even thicker may be the best option for some, there are a few drawbacks. Extra thick mattresses include more layers, so they can be extremely pricey, with some high-quality thick beds costing more than $1500.

How Mattress Thickness Influences Sleep Quality

The thickness of a mattress is a critical factor in sleep quality, affecting comfort, support, and temperature control.

Here’s a closer look at how different levels of mattress thickness can impact your sleep experience and what to consider for your unique needs.

a. Enhanced Comfort for a Better Night’s Sleep

A mattress’s thickness often determines its comfort level. Thicker mattresses generally offer a plush, luxurious feel due to additional foam or cushioning layers, which can provide a softer and more relaxing sleep surface.

This increased comfort is especially beneficial for side sleepers, who require additional cushioning for pressure points like the hips and shoulders. Without adequate thickness, these sleepers may experience discomfort as their body weight is concentrated on smaller areas.

On the other hand, back and stomach sleepers, whose weight is distributed more evenly, may not need as thick a mattress for comfort.

However, many still enjoy the extra softness of a thicker mattress, which can improve relaxation and help create a more restful environment.

b. Optimal Support for Spinal Health

The right mattress thickness also influences the level of support provided, which is essential for spinal alignment and overall sleep quality.

This is especially true for heavier sleepers, as a thicker mattress—typically 10-12 inches or more—can prevent sagging and maintain shape over time. Thicker mattresses are better suited to distributing weight effectively, offering both stability and comfort.

Lighter sleepers, on the other hand, may not find extra thickness as beneficial. They may not sink as deeply into a thick mattress, which can reduce the effectiveness of contouring layers designed to support the body.

For these sleepers, a thinner mattress may allow for a more balanced, supportive feel, offering just the right level of contouring without making them feel “floating” on the surface.

Proper spinal alignment is key to a comfortable sleep posture, and thicker mattresses often provide better contouring to natural curves.

Choosing the right thickness for your weight and sleeping position helps promote healthy alignment, ensuring restful and rejuvenating sleep.

c. Temperature Management and Heat Dissipation

Mattress thickness can also impact temperature regulation, a critical component of a comfortable sleep environment.

Thicker mattresses, particularly those made entirely of memory foam, may tend to retain more heat, potentially making sleep uncomfortable for those who sleep warm.

Dense foam layers in thick mattresses restrict airflow and trap body heat, which can cause sleepers to feel hot and wake up frequently.

If you tend to sleep hot but prefer a thick mattress, look for options with built-in cooling technology, such as gel-infused foam, open-cell designs, or breathable fabric covers.

Hybrid mattresses, which blend foam with innerspring coils, offer better airflow and heat dissipation, combining the comfort of a thick mattress with a cooler sleep surface.

For sleepers who prioritize temperature regulation, a thinner mattress—typically 8-10 inches—may provide better airflow and keep heat from building up.

Latex mattresses are especially known for their natural breathability and can be an excellent option for a cool, comfortable night’s sleep.

FAQS

Should I use a mattress topper to add thickness to my bed?

It’s not uncommon for sleepers to purchase a topper to modify their mattress comfort. A good mattress topper can add to the overall softness, luxuriousness, and support of your mattress. It can also increase the thickness of your mattress and even and prolong its lifespan. Not to mention, toppers are an affordable way to add thickness to your bed without purchasing a new mattress.

How thick is the average mattress?

The average thickness of mattresses ranges between 8 to 14 inches. Typically, the best mattresses have a comfort layer at least 2-3 inches thick with a base layer 6-8 inches thick. Also, they contain a 1-2 inch thick transition layer. It’s best to choose mattresses within this range to maintain good quality sleep.

Does a thicker mattress guarantee better comfort?

Not always. While a thicker mattress often offers more cushioning and support, it may not be the best choice for everyone. For instance, lighter individuals might not sink in enough to experience the full benefits of support in a very thick mattress. Also, thicker mattresses tend to retain more heat, which could be uncomfortable for people who sleep hot.

How thick should a memory foam mattress be?

If you are purchasing a memory foam mattress, you should consider beds 10 to 14 inches thick. Mattresses in this range are durable and will provide sleepers with the proper support while asleep. Choosing a mattress thinner than recommended may take away from the natural comfort of a memory foam mattress. Thinner memory foam mattresses are also likely to sag and might become damaged.

Do thicker mattresses have a longer lifespan?

Yes, generally speaking, thicker mattresses tend to be more durable since the additional layers help distribute wear more evenly over time. A mattress that’s at least 10 inches thick is often more resilient and longer-lasting, especially if it’s constructed from high-quality materials.

Do I need bigger sheets for thicker mattresses?

Mattresses thicker than 14 inches may need a larger size sheet to fit properly. Furthermore, for beds with additional items like mattress toppers or pads, you may need a bigger size as well. If your sheets are constantly popping off your bed, we recommend purchasing tight-fitted sheets with deep pockets to keep them on.

What mattress thickness works best for back pain relief?

For those dealing with back pain, a mattress thickness of around 10-12 inches is usually recommended. This thickness provides a good balance of support and contouring to keep the spine aligned, helping to ease pressure on the back and improve sleep quality.

How high should my bed be?

We recommend keeping your bed at least 25 inches from the ground. A mattress can be 12 inches or more,  so most people consider purchasing foundations around 8.5 inches to achieve the suggested height. Remember, sheets, mattress toppers, or pads all contribute to the overall height of your bed.

Is a specific mattress thickness better for adjustable bases?

Yes, if you have an adjustable base, it’s ideal to go with a mattress that’s between 8-12 inches thick. This thickness allows the mattress to flex easily with the base’s movement while maintaining the right level of support and comfort.

See Also: 10 Inch vs. 12 Inch Mattress

Conclusion

Buying a thin mattress can contribute to poor sleep, but a thicker mattress may be uncomfortable for some. Sometimes, when mattresses are too thick, it’s harder for sleepers to climb in and out of bed. Typically, the best mattress for you will depend on your sleeping position and body type.

A good rule of thumb is to choose a mattress within the 10 to 14-inch range since they are known to provide individuals with a good night’s sleep.