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Find Your Perfect Fit
This mattress size guide breaks down each mattress size, dimensions, and who itโs best for, to help you decide which is the best fit for you and your space.
| Size | Dimensions | Best For (Type of Sleeper) | Best For (Type of Room |
| Twin | 38โณ x 75โณ | Toddlers, Children, Single Adult Sleepers | Shared Rooms, Bunk Beds, Dorm Rooms, Guest Rooms, RVs |
| Twin XL | 38โณ x 80โณ | Children, Single Adults | Shared Rooms, Bunk Beds, Dorms, Lofts, Guest Rooms, RVs |
| Full (Double) | 54โณ x 75โณ | Children, Single Adults, Couples who like to sleep close to each other, Adults with co-sleeping children and/or pets | Small Master Bedrooms, Lofts, Guest Rooms |
| Queen | 60โณ x 80โณ | Single Sleepers, Couples, Adults who co-sleep with children and/or pets | Master Bedrooms, Guest Rooms |
| King | 76โณ x 80โณ | Single Sleepers, Couples, Adults who co-sleep with children and/or pets | Master Bedrooms, Large Guest Rooms, In-law Suites |
| Split King | 38โณ x 80โณ (each mattress) | Couples with different mattress preferences and sleeping positions, Sleepers who want to use an adjustable bed frame | Master Bedrooms |
| California King (Cal King) | 72โณ x 84โณ | Couples, Tall people, Adults who co-sleep with children and/or pets | Master Bedrooms, Large Guest Rooms, In-law Suites |
| Wyoming King | 84โณ x 84โณ | Couples, Larger-Bodied Couples, Tall Adults, Adults who co-sleep with children and/or pets, Sleepers with Large Bedroom Space | Extra-Large Master Bedrooms |
| Texas King | 80โณ x 96โณ | Couples, Larger-Bodied Couples, Tall Adults, Adults who co-sleep with children and/or pets | Extra-Large Master Bedrooms |
| Alaskan King | 108โณ x 108โณ | Couples, Larger-Bodied Couples, Tall Adults, Adults who co-sleep with children and/or pets | Extra-Large Master Bedrooms |
Once you have the sizing down, take our mattress quiz or consult our mattress guide to get a better idea of which may be the best mattress according to your sleep preferences and lifestyle needs.
Choosing the Best Size for You
Choosing the right bed size is a huge part of the mattress-buying process. But while many people will want to stick with the same mattress size as before, others may have undergone lifestyle changes that warrant a larger or smaller size.
For instance, are you an active sleeper? Do you have any animals or children sharing your bed? Do you have a partner? Has the size of your master bedroom changed? These are just a few simple questions to ask yourself when deciding which mattress size is right for you.
Mattress Sizes Explained
Below are the most common standard mattress sizes. Weโll highlight each bed sizeโs pros and cons, along with its dimensions, to help you determine whether itโs the right fit for what youโre looking for.
Twin
A twin-size mattress, also known as a โsingle bedโ or โsingle mattress,โ is typically 38โ W x 75โ L. This is the smallest of the adult-size mattresses. A twin-size mattress would be suitable for a child who has outgrown their crib mattress or toddler bed, a single adult, or sleepers with small bedrooms.
This size is commonly used for daybeds, bunk beds, college dorm rooms, or a small guest bedroom.
Twin XL
A twin XL-size mattress is 38โ W x 80โ L. This mattress is the same width as a traditional twin but longer. This is great for tall sleepers who do not have room for a wider bed.
Learn more about the differences in our twin vs twin-XL mattress guide.
Full
A full-size mattress is 54โ W x 75โ L. This size mattress may also be referred to as a โstandard double bed.โ
For single active sleepers who like to sprawl out or couples who have a small bedroom, a full-size mattress may be a great choice.
Queen
A queen-size mattress is generally 60โ W x 80โ 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 share a bed with children or pets.
Notably, there is also a short queen-size mattress that is 60โ W x 75โ L, and an Olympic queen-size mattress that is 66โ W x 80โ L.
To comfortably fit a queen mattress, it is recommended that your bedroom be at least 10โ x 10โ.
King
A king-size mattress is 76โW x 80โL. This mattress is extremely comfortable for single sleepers, couples, or sleepers who share a bed with children or pets. The recommended room size to fit a king-size mattress in your home is at least 12โ x 12โ.
For comparisonโs sake, a king-size mattress is the same size as two twin-XL mattresses.
Split King-Size Bed Dimensions
A split king-size mattress uses two identical-sized mattresses โ each 38โ W x 80โ L โ which equals the size of a complete king-size mattress. Sleepers who benefit from a split bed often have very different sleeping preferences from their partner. The split mattress allows sleepers to have a mattress that is individually right for them, offering personal space without sacrificing the sleep of their partner.
One major benefit of this mattress style 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.
California King-Size Bed Dimensions
A California king-size mattress measures 72โ W x 84โ. This mattress is great for sleepers who are taller-than-average or just want a little extra height to their king-size mattress. It is extremely spacious for active sleepers or couples who may sleep with children or pets.
While the California king mattress is 4โ longer in length, it is actually narrower than a standard king-size mattress by 4โ. To comfortably fit a California king-size mattress, it is recommended that your bedroom be at least 12โ x 12โ.
RELATED: Whatโs the difference between a California King vs. King?
Our Go-To Picks in Each Size
From a cozy twin to a California king, here are some of our top picks in each size I covered above.
Twin-Size Mattress
Saatva Classic
The Saatvaโs coil-on-coil construction provides a classic innerspring feel. Itโs a good option for combo sleepers, who will want to feel free to switch positions and avoid feeling โstuckโ in the mattress. It comes in three firmness levels, so you should be able to find one that suits your needs. The white glove delivery Saatva provides is an added perk and will save you the headache of getting rid of your old mattress (they take it away for free!). For more information, watch our video review.
What our tester says:
โThe Saatva Classicโs springy surface is perfect for combination sleepers looking for ease of movement as they toss and turn throughout the night. Also, back sleepers are perhaps best suited to the bedโs lifted support and balanced cushioning from the pillow top.โ โ Livvi DiCicco, staff writer and certified sleep science coach
Twin XL Mattress
Helix Midnight
The Helix Midnight is amongst Helixโs line of six standard mattresses. Itโs known for its more balanced feel, allowing it to accommodate back sleepers, who usually need a medium-firm bed. We also recommend it for couples, as it scored well on our motion isolation, responsiveness, edge support, and cooling tests. For a plusher and more cooling version of this mattress, see the Helix Midnight Luxe. Learn more in our video review.
What our tester says:
โI think the Helix Midnight is a good choice for couples. It has excellent cooling abilities, responsive materials for sex, and strong edge support, so you can use the whole mattress without fear of sinkage or sagging near the sides. Combination sleepers should also be comfortable, as it has some bounce.โ โ Sosha Lewis, senior staff writer and certified sleep science coach
Full-Size Mattress
Leesa Sapira Chill
The Leesa Sapira Chill is a hybrid mattress, available in three firmness levels. We tested the Medium-Firm model and felt it was just softer than average. It should be especially comfortable for back sleepers and side sleepers. The bed also has some effective cooling technology built into it, which helps to keep sleepers cool throughout the night. Learn more in our video review.
What our tester says:
โSleepers with joint pain can appreciate the soft, plush feel, which can reduce tension and stiffness at their pressure points. I also think back sleepers and side sleepers will be comfortable on this mattress.โ โ Riley Otis, staff writer
Best Queen Mattress
Nectar Mattress
The Nectar delivers a balance of comfort and support: itโs definitely contouring, but still provides a firm enough foundation for most light to average weight sleepers, especially if they sleep on their back or stomach. Plus, a lengthy trial period, lifetime warranty, and affordable price make the Nectar a reassuring choice for many. Watch our video review to learn more.
What our tester says:
โI think back sleepers are going to love the Nectar Classic. These sleepers will get plenty of support from the firm memory foam in the Nectar Classic, which should translate to great pressure relief and a good nightโs sleep. Similarly, lightweight and average-weight stomach sleepers should find that they get enough support around their hips to sleep comfortably on this mattress. The Nectar Classic is firm enough to keep these sleepersโ spines in a healthy position.โ โ Kenny Timper, staff writer and certified sleep science coach
Best King Mattress
The WinkBed
The WinkBed is a luxury hybrid mattress. It has a similarly supportive and sturdy feel to a traditional innerspring mattress, but upgrades like a Euro top and cooling Tencel cover give it a touch of modern luxury. Available in three firmness levels, there is a WinkBed for just about every sleeper. And a responsive and bouncy feel makes it a great pick for combination sleepers. Learn more in our video review.
What our tester says:
โIf you like the feel of a traditional innerspring mattress, the WinkBed could work for you. Since this bed offered great pressure relief around my lumbar region, Iโd also recommend it to folks who suffer from lower back pain.โ โ Nichole Mondshein, lead reviewer and staff writer
How To Pick The Right Mattress Size
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 10โx10โ. The following scaled images can give you an idea of the footprint a queen-size mattress will take up in both a 10ร10โฒ bedroom and a 12ร12โฒ bedroom.
To fit a larger mattress, such as a king-size bed or California king-size bed, your room should be at least 12โx12โ. The two images below will give you a good idea of how large a king-size mattress is in relation to a 10ร10โฒ room and a 12ร12โฒ room.
RELATED: How often should I replace my mattress?
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
- Check out our full guide on the best mattresses 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
- See our top picks of the best mattresses for couples and learn more!
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 common mattress sizes:
- (2) Twin-XL mattresses
- Split King
- Check out the best mattresses for adjustable bed frames and learn more about what to look for in our buyerโs guide!
Bed and Mattress 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. Room size, sleeper size, future growth, and personal preference are all factors that can help you determine which mattress size is the best fit for you.