Bed Sizes – Dimensions for King Mattresses, Queen, Full and More

Selecting the right bed size is a huge part of the mattress buying process. For many sleepers, it can be a habit to stick with the same mattress size as what you had before when it’s time to replace, but things change—sleepers change.

Are you an active sleeper? Do you have animals or children sharing the bed with you? Do you have a partner? You may also want to consider if your bedroom size changes, if your mattress size should change as well. These are just a few of the simple questions to ask yourself when deciding what mattress size is right for you.

This guide breaks down each mattress and bed size dimensions and specs to give you all the details and help you decide which is the best fit for you and your space. Once you have the sizing down, take our mattress quiz to get a better idea of the best mattresses for your sleep preferences.

In a rush? Click here to skip the details and jump right to the summary! 

Twin Size Bed Dimensions

A Twin size mattress is typically 38” W x 75” L. This is the smallest of the adult size mattresses. A Twin size mattress would be suitable for a child who has outgrown the toddler bed, a single adult, or those with small bedrooms.

This size is commonly used for daybeds, bunk beds, dorm rooms, or a small guest bedroom.

This is also the smallest mattress for most of the popular online mattress companies. For sleepers tight on budget or space, a Twin size mattress can provide the same luxury feel of a larger mattress, without costing as much or taking up as much room.

Best Twin Sized Mattress

Saatva Mattress

The Saatva’s coil-on-coil construction provides a classic innerspring feel. It's a good option for combo sleepers, who will want to feel free to switch positions and avoid feeling “stuck” in the mattress. It comes in three firmness levels, so you should be able to find one that suits your needs.

Sleepopolis Score 4.5/5
Read Full Review

Material

Hybrid

Trial Period

180 nights

Shipping Method

Free white glove delivery

Firmness

Multiple firmness options

Warranty

15-year warranty

Price Range

$$$$$

We recommend this mattress for the following sleeper types:

Hot Sleepers
If you often overheat while you sleep, this mattress should help you stay cool.
Back Pain
This bed is perfect for anyone suffering from back pain.
Back Sleepers
Ideal for lightweight, average weight, and heavyweight back sleepers.
Side Sleepers
Ideal for lightweight, average weight, and heavyweight side sleepers.
Stomach Sleepers
Ideal for lightweight, average weight, and heavyweight stomach sleepers.

Financing Options

Financing options are available for this mattress.

Average Customer Rating
4.9/5
Watch Our Video Review
Best Twin Sized Mattress

Saatva Mattress

The Saatva’s coil-on-coil construction provides a classic innerspring feel. It's a good option for combo sleepers, who will want to feel free to switch positions and avoid feeling “stuck” in the mattress. It comes in three firmness levels, so you should be able to find one that suits your needs.

Sleepopolis Score 4.5/5
Read Full Review

Material

Hybrid

Warranty

15-year warranty

Firmness

Multiple firmness options

Shipping Method

Free white glove delivery

Trial Period

180 nights

Price Range

$$$$$

We recommend this mattress for the following sleeper types:

Hot Sleepers
If you often overheat while you sleep, this mattress should help you stay cool.
Back Pain
This bed is perfect for anyone suffering from back pain.
Back Sleepers
Ideal for lightweight, average weight, and heavyweight back sleepers.
Side Sleepers
Ideal for lightweight, average weight, and heavyweight side sleepers.
Stomach Sleepers
Ideal for lightweight, average weight, and heavyweight stomach sleepers.

Financing Options

Financing options are available for this mattress.

Average Customer Rating
4.9/5
Watch Our Video Review
Best Twin Sized Mattress

Saatva Mattress

The Saatva’s coil-on-coil construction provides a classic innerspring feel. It's a good option for combo sleepers, who will want to feel free to switch positions and avoid feeling “stuck” in the mattress. It comes in three firmness levels, so you should be able to find one that suits your needs.

Sleepopolis Score 4.5/5
Read Full Review

Material

Hybrid

Firmness

Multiple firmness options

Trial Period

180 nights

Warranty

15-year warranty

Shipping Method

Free white glove delivery

Price Range

$$$$$

We recommend this mattress for the following sleeper types:

Hot Sleepers
If you often overheat while you sleep, this mattress should help you stay cool.
Back Pain
This bed is perfect for anyone suffering from back pain.
Back Sleepers
Ideal for lightweight, average weight, and heavyweight back sleepers.
Side Sleepers
Ideal for lightweight, average weight, and heavyweight side sleepers.
Stomach Sleepers
Ideal for lightweight, average weight, and heavyweight stomach sleepers.

Financing Options

Financing options are available for this mattress.

Average Customer Rating
4.9/5
Watch Our Video Review

Twin XL Size Bed Dimensions

A Twin XL size mattress is 38” W x 80” L. This mattress is the same width as a traditional twin, but is 5” longer in length. This is great for tall adults who do not have room for a wider bed. Not all sheets or comforters come available in Twin XL, so be sure to double check and know the difference before shopping for bedding.

Can you use two Twin XL mattresses on a King size frame?

The short answer is yes. Two Twin XL mattresses make up the dimensions of one King size mattress. This is a popular strategy for sleeping partners who have very different feel or firmness preferences. Joining two mattresses together on a single frame is also a nice option for sleepers who want to use an adjustable frame. The separate mattresses allow sleepers to sit up or lie back without disrupting their partner. If you do opt for 2 Twin XL mattresses on a King frame you can either use individual Twin XL bedding sets or a single King size sheet set.

Best Twin XL Mattress

Helix Midnight Mattress

The Helix Midnight has a medium support level and bounce that will appeal to a wide range of sleep preferences. The Midnight also does an exceptional job of isolating motion, making it a great choice for couples that move around at night.

Sleepopolis Score 4.0/5
Read Full Review

Material

Hybrid

Trial Period

100 nights

Shipping Method

Free shipping

Firmness

Soft: 6/10

Warranty

10-year warranty

Price Range

$$$$$

We recommend this mattress for the following sleeper types:

Couples
This bed has great motion isolation so you will not feel your partner tossing and turning at night.
Back Sleepers
Ideal for lightweight and average weight back sleepers.
Side Sleepers
Ideal for average weight side sleepers.
Combination Sleepers
Ideal for average weight combination sleepers.

Financing Options

Financing options are available for this mattress.

Average Customer Rating
4.5/5
Watch Our Video Review
Best Twin XL Mattress

Helix Midnight Mattress

The Helix Midnight has a medium support level and bounce that will appeal to a wide range of sleep preferences. The Midnight also does an exceptional job of isolating motion, making it a great choice for couples that move around at night.

Sleepopolis Score 4.0/5
Read Full Review

Material

Hybrid

Warranty

10-year warranty

Firmness

Soft: 6/10

Shipping Method

Free shipping

Trial Period

100 nights

Price Range

$$$$$

We recommend this mattress for the following sleeper types:

Couples
This bed has great motion isolation so you will not feel your partner tossing and turning at night.
Back Sleepers
Ideal for lightweight and average weight back sleepers.
Side Sleepers
Ideal for average weight side sleepers.
Combination Sleepers
Ideal for average weight combination sleepers.

Financing Options

Financing options are available for this mattress.

Average Customer Rating
4.5/5
Watch Our Video Review
Best Twin XL Mattress

Helix Midnight Mattress

The Helix Midnight has a medium support level and bounce that will appeal to a wide range of sleep preferences. The Midnight also does an exceptional job of isolating motion, making it a great choice for couples that move around at night.

Sleepopolis Score 4.0/5
Read Full Review

Material

Hybrid

Firmness

Soft: 6/10

Trial Period

100 nights

Warranty

10-year warranty

Shipping Method

Free shipping

Price Range

$$$$$

We recommend this mattress for the following sleeper types:

Couples
This bed has great motion isolation so you will not feel your partner tossing and turning at night.
Back Sleepers
Ideal for lightweight and average weight back sleepers.
Side Sleepers
Ideal for average weight side sleepers.
Combination Sleepers
Ideal for average weight combination sleepers.

Financing Options

Financing options are available for this mattress.

Average Customer Rating
4.5/5
Watch Our Video Review

Full Size Bed Dimensions

A Full size mattress is 54”W x 75” L. This size mattress may also be referred to as a “standard double.” For single active sleepers who like to sprawl out or couples who have a small bedroom, a Full size mattress may be suitable. A Full or double size mattress may be a tight squeeze for couples who share the bed with children or pets.

Here are some specs to think about when considering a Full size mattress:

  • For single sleepers, that is 54” of sleeping space.
  • For partners, that is 27” of sleeping space per person (11” less than a Twin size mattress).
  • A 6’ tall sleeper would have only 3” of extra space if fully extended on this mattress.

Best Full Size Mattress

WinkBed Mattress

The WinkBed is a hybrid mattress that comes in three firmness levels, so most sleepers should find a model that suits their needs. The WinkBed is also a great bed for couples, thanks to its strong edge support and low motion transfer.

Sleepopolis Score 4.6/5
Read Full Review

Material

Hybrid

Trial Period

120 nights

Shipping Method

Free shipping

Firmness

Multiple firmness options

Warranty

Lifetime warranty

Price Range

$$$$$

We recommend this mattress for the following sleeper types:

Hot Sleepers
If you often overheat while you sleep, this mattress should help you stay cool.
Back Pain
This bed is perfect for anyone suffering from back pain.
Back Sleepers
Ideal for lightweight and average weight back sleepers.
Stomach Sleepers
Ideal for lightweight and average weight stomach sleepers.

Financing Options

Financing options are available for this mattress.

Average Customer Rating
4.6/5
Watch Our Video Review
Best Full Size Mattress

WinkBed Mattress

The WinkBed is a hybrid mattress that comes in three firmness levels, so most sleepers should find a model that suits their needs. The WinkBed is also a great bed for couples, thanks to its strong edge support and low motion transfer.

Sleepopolis Score 4.6/5
Read Full Review

Material

Hybrid

Warranty

Lifetime warranty

Firmness

Multiple firmness options

Shipping Method

Free shipping

Trial Period

120 nights

Price Range

$$$$$

We recommend this mattress for the following sleeper types:

Hot Sleepers
If you often overheat while you sleep, this mattress should help you stay cool.
Back Pain
This bed is perfect for anyone suffering from back pain.
Back Sleepers
Ideal for lightweight and average weight back sleepers.
Stomach Sleepers
Ideal for lightweight and average weight stomach sleepers.

Financing Options

Financing options are available for this mattress.

Average Customer Rating
4.6/5
Watch Our Video Review
Best Full Size Mattress

WinkBed Mattress

The WinkBed is a hybrid mattress that comes in three firmness levels, so most sleepers should find a model that suits their needs. The WinkBed is also a great bed for couples, thanks to its strong edge support and low motion transfer.

Sleepopolis Score 4.6/5
Read Full Review

Material

Hybrid

Firmness

Multiple firmness options

Trial Period

120 nights

Warranty

Lifetime warranty

Shipping Method

Free shipping

Price Range

$$$$$

We recommend this mattress for the following sleeper types:

Hot Sleepers
If you often overheat while you sleep, this mattress should help you stay cool.
Back Pain
This bed is perfect for anyone suffering from back pain.
Back Sleepers
Ideal for lightweight and average weight back sleepers.
Stomach Sleepers
Ideal for lightweight and average weight stomach sleepers.

Financing Options

Financing options are available for this mattress.

Average Customer Rating
4.6/5
Watch Our Video Review

Queen Size Bed Dimensions

A Queen size mattress is 60”W x 80”L. This is the most popular mattress size in the United States right now and is a comfortable fit for single active sleepers, couples, and those who may share the bed with children or pets. To comfortably fit a Queen mattress, it is recommended that your bedroom be at least 10’L x 10’W.

Some specs to consider:

  • For single sleepers, that is 60” of sleeping space.
  • For partners, that is 30” of sleeping space per person (8” less than a Twin size mattress).
  • A 6’ tall sleeper would have 8” of extra space if fully extended on this mattress.
  • See my top choices for the best queen size mattresses.

FAQ:  Best mattress for couples

Best Queen Mattress

Bear Mattress

I appreciate the firm and responsive feel of the Bear mattress. Its combination of support and pressure relief makes it an awesome option for anyone struggling with back pain. The Celliant cover also does a great job of keeping the mattress cool.

Sleepopolis Score 4.2/5
Read Full Review

Material

Foam

Trial Period

100 nights

Shipping Method

Free shipping

Firmness

Medium-firm: 7/10

Warranty

10-year limited warranty

Price Range

$$$$$

We recommend this mattress for the following sleeper types:

Hot Sleepers
If you often overheat while you sleep, this mattress should help you stay cool.
Back Sleepers
Ideal for lightweight and average weight back sleepers.

Financing Options

Financing options are available for this mattress.

Average Customer Rating
4.7/5
Watch Our Video Review
Best Queen Mattress

Bear Mattress

I appreciate the firm and responsive feel of the Bear mattress. Its combination of support and pressure relief makes it an awesome option for anyone struggling with back pain. The Celliant cover also does a great job of keeping the mattress cool.

Sleepopolis Score 4.2/5
Read Full Review

Material

Foam

Warranty

10-year limited warranty

Firmness

Medium-firm: 7/10

Shipping Method

Free shipping

Trial Period

100 nights

Price Range

$$$$$

We recommend this mattress for the following sleeper types:

Hot Sleepers
If you often overheat while you sleep, this mattress should help you stay cool.
Back Sleepers
Ideal for lightweight and average weight back sleepers.

Financing Options

Financing options are available for this mattress.

Average Customer Rating
4.7/5
Watch Our Video Review
Best Queen Mattress

Bear Mattress

I appreciate the firm and responsive feel of the Bear mattress. Its combination of support and pressure relief makes it an awesome option for anyone struggling with back pain. The Celliant cover also does a great job of keeping the mattress cool.

Sleepopolis Score 4.2/5
Read Full Review

Material

Foam

Firmness

Medium-firm: 7/10

Trial Period

100 nights

Warranty

10-year limited warranty

Shipping Method

Free shipping

Price Range

$$$$$

We recommend this mattress for the following sleeper types:

Hot Sleepers
If you often overheat while you sleep, this mattress should help you stay cool.
Back Sleepers
Ideal for lightweight and average weight back sleepers.

Financing Options

Financing options are available for this mattress.

Average Customer Rating
4.7/5
Watch Our Video Review

King Size Bed Dimensions

A King size mattress is 76”W x 80”L. This mattress is extremely comfortable for single active sleepers as well as couples who share a bed with children or pets. To comfortably fit a King size mattress, it is recommended that your bedroom be at least 12’W x 12’W.

For comparison’s sake, a King size mattress is the same size as two Twin XL mattresses. If you and your partner share a bed, but have very different sleeping preferences, the Split King could be a nice option since it allows each side of the bed to be distinctively different feels. Split King mattresses are also good choices for sleepers who are considering adjustable bed frames.

Consider the following specs before purchasing a King size mattress:

  • For single sleepers, it’s 76” of sleeping space.
  • For partners, it’s 38” of sleeping space per person (the same width as a Twin size mattress).
  • A 6’ tall sleeper would have 8” of extra space if fully extended on this mattress (the same length as a Queen size mattress).
  • Check out my picks for the best king size mattresses of the year!

Best King Mattress

Casper Wave Hybrid Mattress

The Wave Hybrid does a great job combining support and softness to strike a great balance between pressure relief and lift. This is especially nice for sleepers who struggle with back pain or heavy people in need of durable support.

Sleepopolis Score 4.5/5
Read Full Review

Material

Hybrid

Trial Period

100 nights

Shipping Method

Free shipping

Firmness

Soft: 5/10

Warranty

10-year limited warranty

Price Range

$$$$$

We recommend this mattress for the following sleeper types:

Couples
This bed has great motion isolation so you will not feel your partner tossing and turning at night.
Hip Pain
This bed is perfect for anyone suffering from hip pain.
Back Pain
This bed is perfect for anyone suffering from back pain.
Back Sleepers
Ideal for lightweight and average weight back sleepers.
Side Sleepers
Ideal for lightweight, average weight, and heavyweight side sleepers.
Stomach Sleepers
Ideal for lightweight and average weight stomach sleepers.

Financing Options

Financing options are available for this mattress.

Average Customer Rating
4.4/5
Watch Our Video Review
Best King Mattress

Casper Wave Hybrid Mattress

The Wave Hybrid does a great job combining support and softness to strike a great balance between pressure relief and lift. This is especially nice for sleepers who struggle with back pain or heavy people in need of durable support.

Sleepopolis Score 4.5/5
Read Full Review

Material

Hybrid

Warranty

10-year limited warranty

Firmness

Soft: 5/10

Shipping Method

Free shipping

Trial Period

100 nights

Price Range

$$$$$

We recommend this mattress for the following sleeper types:

Couples
This bed has great motion isolation so you will not feel your partner tossing and turning at night.
Hip Pain
This bed is perfect for anyone suffering from hip pain.
Back Pain
This bed is perfect for anyone suffering from back pain.
Back Sleepers
Ideal for lightweight and average weight back sleepers.
Side Sleepers
Ideal for lightweight, average weight, and heavyweight side sleepers.
Stomach Sleepers
Ideal for lightweight and average weight stomach sleepers.

Financing Options

Financing options are available for this mattress.

Average Customer Rating
4.4/5
Watch Our Video Review
Best King Mattress

Casper Wave Hybrid Mattress

The Wave Hybrid does a great job combining support and softness to strike a great balance between pressure relief and lift. This is especially nice for sleepers who struggle with back pain or heavy people in need of durable support.

Sleepopolis Score 4.5/5
Read Full Review

Material

Hybrid

Firmness

Soft: 5/10

Trial Period

100 nights

Warranty

10-year limited warranty

Shipping Method

Free shipping

Price Range

$$$$$

We recommend this mattress for the following sleeper types:

Couples
This bed has great motion isolation so you will not feel your partner tossing and turning at night.
Hip Pain
This bed is perfect for anyone suffering from hip pain.
Back Pain
This bed is perfect for anyone suffering from back pain.
Back Sleepers
Ideal for lightweight and average weight back sleepers.
Side Sleepers
Ideal for lightweight, average weight, and heavyweight side sleepers.
Stomach Sleepers
Ideal for lightweight and average weight stomach sleepers.

Financing Options

Financing options are available for this mattress.

Average Customer Rating
4.4/5
Watch Our Video Review

Split King Size Bed Dimensions

A Split King size mattress uses two identical-sized mattresses—each 38”W x 80”L—which equals the size of a complete King size mattress. Sleepers who benefit from a Split King bed often have very different sleeping preferences than their partner. The split mattress allows sleepers to have a mattress that is individually right for them, without sacrificing the sleep of their partner.

Some Split King beds are joined at the bottom half of the mattress and only split at the top. This style is more for sleepers who do not have different sleep preferences, since the interior of the mattress is the same throughout. Some couples may also opt for a flippable mattress that offers a different firmness on each side, such as the Layla mattress.

HELP:  How to choose a mattress

The benefit of this style of mattress is that, when used on an adjustable frame, each side of the mattress can move independently, allowing sleepers to sit up or lie back without disturbing their partner. The obvious drawback here is finding sheets to fit this style of mattress. These sheets are usually very expensive and may be hard to find.

Ready to start looking at your options? Nectar has a Split King adjustable frame that will allow you and your partner to sleep in your preferred sleeping positions. Make sure to add the adjustable frame to your cart with any mattress purchase:

Best Mattress With Split King Frame

Nectar Mattress

The original Nectar mattress is a pressure-relieving, yet supportive, bed. It’s made with a thick layer of gel memory foam, which allows the sleeper to really sink into its surface.

Sleepopolis Score 4.2/5
Read Full Review

Material

Foam

Trial Period

365 nights

Shipping Method

Free shipping

Firmness

Soft: 6/10

Warranty

Lifetime warranty

Price Range

$$$$$

We recommend this mattress for the following sleeper types:

Couples
This bed has great motion isolation so you will not feel your partner tossing and turning at night.
Joint Pain
This bed is perfect for anyone suffering from joint pain.
Hip Pain
This bed is perfect for anyone suffering from hip pain.
Back Sleepers
Ideal for lightweight and average weight back sleepers.
Side Sleepers
Ideal for lightweight and average weight side sleepers.

Financing Options

Financing options are available for this mattress.

Average Customer Rating
4.8/5
Watch Our Video Review
Best Mattress With Split King Frame

Nectar Mattress

The original Nectar mattress is a pressure-relieving, yet supportive, bed. It’s made with a thick layer of gel memory foam, which allows the sleeper to really sink into its surface.

Sleepopolis Score 4.2/5
Read Full Review

Material

Foam

Warranty

Lifetime warranty

Firmness

Soft: 6/10

Shipping Method

Free shipping

Trial Period

365 nights

Price Range

$$$$$

We recommend this mattress for the following sleeper types:

Couples
This bed has great motion isolation so you will not feel your partner tossing and turning at night.
Joint Pain
This bed is perfect for anyone suffering from joint pain.
Hip Pain
This bed is perfect for anyone suffering from hip pain.
Back Sleepers
Ideal for lightweight and average weight back sleepers.
Side Sleepers
Ideal for lightweight and average weight side sleepers.

Financing Options

Financing options are available for this mattress.

Average Customer Rating
4.8/5
Watch Our Video Review
Best Mattress With Split King Frame

Nectar Mattress

The original Nectar mattress is a pressure-relieving, yet supportive, bed. It’s made with a thick layer of gel memory foam, which allows the sleeper to really sink into its surface.

Sleepopolis Score 4.2/5
Read Full Review

Material

Foam

Firmness

Soft: 6/10

Trial Period

365 nights

Warranty

Lifetime warranty

Shipping Method

Free shipping

Price Range

$$$$$

We recommend this mattress for the following sleeper types:

Couples
This bed has great motion isolation so you will not feel your partner tossing and turning at night.
Joint Pain
This bed is perfect for anyone suffering from joint pain.
Hip Pain
This bed is perfect for anyone suffering from hip pain.
Back Sleepers
Ideal for lightweight and average weight back sleepers.
Side Sleepers
Ideal for lightweight and average weight side sleepers.

Financing Options

Financing options are available for this mattress.

Average Customer Rating
4.8/5
Watch Our Video Review

California King Size Bed Dimensions

A California King size mattress is 72”W x 84”. This mattress is great for sleepers who are very tall or just want a little extra length to the mattress. It is extremely spacious for active sleepers or couples who may sleep with children or pets. While the California King mattress is 4” longer in length, it is actually narrower than a standard King size mattress by 4”. To comfortably fit a California King size mattress, it is recommended that your bedroom be at least 12’W x 12’L.

COMPARE: What’s the difference between a California King vs. King?

These specs mean:

  • For single sleepers, that is 72” of sleeping space.
  • For partners, that is 36” of sleeping space per person (2” less than a Twin size mattress).
  • A 6’ tall sleeper would have 12” of extra space if fully extended on this mattress.

Best California King Mattress

DreamCloud Mattress

The DreamCloud Mattress is a luxury hybrid mattress made with layers of memory foam and pocketed coils. It offers a great combination of support and pressure relief that back sleepers will really enjoy.

Sleepopolis Score 4.7/5
Read Full Review

Material

Hybrid

Trial Period

365 nights

Shipping Method

Free shipping

Firmness

Soft: 4.5/10

Warranty

Lifetime warranty

Price Range

$$$$$

We recommend this mattress for the following sleeper types:

Hot Sleepers
If you often overheat while you sleep, this mattress should help you stay cool.
Back Sleepers
Ideal for average weight back sleepers.

Financing Options

Financing options are available for this mattress.

Average Customer Rating
4.6/5
Best California King Mattress

DreamCloud Mattress

The DreamCloud Mattress is a luxury hybrid mattress made with layers of memory foam and pocketed coils. It offers a great combination of support and pressure relief that back sleepers will really enjoy.

Sleepopolis Score 4.7/5
Read Full Review

Material

Hybrid

Warranty

Lifetime warranty

Firmness

Soft: 4.5/10

Shipping Method

Free shipping

Trial Period

365 nights

Price Range

$$$$$

We recommend this mattress for the following sleeper types:

Hot Sleepers
If you often overheat while you sleep, this mattress should help you stay cool.
Back Sleepers
Ideal for average weight back sleepers.

Financing Options

Financing options are available for this mattress.

Average Customer Rating
4.6/5
Best California King Mattress

DreamCloud Mattress

The DreamCloud Mattress is a luxury hybrid mattress made with layers of memory foam and pocketed coils. It offers a great combination of support and pressure relief that back sleepers will really enjoy.

Sleepopolis Score 4.7/5
Read Full Review

Material

Hybrid

Firmness

Soft: 4.5/10

Trial Period

365 nights

Warranty

Lifetime warranty

Shipping Method

Free shipping

Price Range

$$$$$

We recommend this mattress for the following sleeper types:

Hot Sleepers
If you often overheat while you sleep, this mattress should help you stay cool.
Back Sleepers
Ideal for average weight back sleepers.

Financing Options

Financing options are available for this mattress.

Average Customer Rating
4.6/5

What size mattress do I need?

When deciding which mattress is the right fit for you and your space, be sure to consider some of the following factors:

What is the size of your room?

To fit a Queen size bed, your room should be at least 10’x10’. The following scaled images can give you an idea of the footprint a Queen size bed / mattress will take up in both a 10×10′ bedroom and a 12×12′ bedroom.

 

 

To fit a King size bed or California King size bed, your room should be at least 12’x12’. The two images below will give you a good idea of how large a King size mattress / bed is in relation to a 10×10′ room and 12×12′ room.

Who will be sleeping in the bed?

Children, depending on age, will likely be most comfortable in the following mattresses:

  • Twin bed
  • Twin XL
  • Full

MORE: Best mattress for kids

Single adults will likely be most comfortable in the following size mattresses:

  • Twin XL
  • Full
  • Queen
  • King

Beds with two adult sleepers will likely be most comfortable in the following size mattresses:

  • Queen
  • King
  • California King

Beds with two adult sleepers and children or pets will likely be most comfortable in the following size mattresses:

  • King
  • California King

Sleepers who want a mattress that will work with an adjustable frame (to move each side independently) should consider the following mattress sizes:

  • (2) Twin XL mattresses
  • Split King

Mattress & Bed Dimensions Summary

There are many different styles and mattress / bed sizes out there, and there is no right or wrong answer as to which one is right for you. Considering room size, sleeper size, future growth, and personal preference are all factors that can help you determine which size mattress would be the best fit for you.

Understanding mattress size dimensions and specs allows you to understand each mattress format and make the best decision for you.

SizeDimensionOptimal For
Twin38"W x 75"LToddlers, Children, Single Adults
Twin XL38"W x 80"LChildren, Single Adults (tall), Sleepers who want to use an adjustable bed frame
Full (Double)54"W x 75"LChildren, Single Adults, Single Adults with Children or Pets, Couples (small)
Queen60"W x 80"LSingle Adults, Single Adults with Children or Pets, Couples
King76"W x 80"LCouples, Couples with Children or Pets
Split King(2) 38"W x 80"LCouples (with varying mattress preferences), Sleepers who want to use an adjustable bed frame
California King72"W x 84"LCouples, Couples with Children or Pets
Logan Block
Logan is the content director of Sleepopolis, which means he not only reviews new mattresses every week, but also curates all the comparisons, best of pages, and video guides on the site. He takes a straightforward, honest approach to his reviews and endeavors to give viewers an objective look at each new product he tries out. Logan has perfected his method by personally testing over 200 different mattresses, so he’s not only able to discern the overall vibe of a specific bed, but to contextualize its feel within the bed-in-a-box market as a whole. When he’s not hopping on a new bed or working with our editorial team to whip up an engaging sleep education guide, you can find him reading books on world history, walking his dog Pepper, or searching for the best cheeseburger in New York City.