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Sleep Number

Mattress Size Guide

How to choose the right bed size

Choosing the right bed size isn't always simple. We want to help you to find what bed size is ideal for you and your needs.

Mattress Size

Mattress Dimensions

Twin 38" wide x 75" long
Twin XL 38" wide x 80" long
Full / Double 54" wide x 75" long
Queen 60" wide x 80" long
King 72" wide x 84" long
California King 76" wide x 80" long
Twin Sized Mattress

Twin Size Mattress Dimensions

38" x 75"

38" X 75"

Bed for One Person

1 person

A twin bed is 38 inches wide and 75 inches long. Twin beds are usually used in children’s rooms, apartments, or a guest bedroom. Twins are a great choice for smaller bedrooms or if you will be moving frequently.
Twin Extra Long Sized Mattress

Twin Extra Long Size mattress Dimensions

38" x 80"

38" X 80"

Bed for One Person

1 person

A twin XL bed or a twin extra-long, is 38 inches wide and 80 inches long. Twin XL beds are perfect for taller individuals, dorm rooms, or shared adult bedrooms because there is more leg room but will leave adequate walking space around the bed.
Full Sized Mattress

Full Size Mattress Dimensions

54" x 80"

54" X 80"

Bed for One Person

1 person

A is 54 inches wide and 75 inches long. It is 6 inches thinner and 5 inches shorter than a queen size bed and will comfortably fit one adult. A full-size bed is perfect for older children, single adults, or smaller bedrooms.
Queen Sized Mattress

Queen Size Mattress Dimensions

60" x 80"

60" X 80"

Bed for Two People

2 person

A is 60 inches wide and 80 inches long. The queen bed can comfortably fit a couple, tall individuals, and single adults who want plenty of sleeping room.
King Sized Mattress

King Size Mattress Dimensions

72" x 80"

72" X 80"

Bed for Two People

2 person

A is 76 inches wide and 80 inches long. As the widest mattress option, king beds are the best option for couples who want maximum personal space, couples sleeping with pets or children, and for large bedrooms
Split King Sized Mattress

Split King Size Mattress Dimensions

72" x 80"

72" X 80"

Bed for Two People

2 person

A split king bed is 76 inches wide by 80 inches long. There are two types of split king beds, a half split or full split. Either option is great for couples who have different preferences of comfort and firmness.
California King Sized Mattress

California King Size Mattress Dimensions

76" x 80"

76" X 80"

Bed for Two People

2 person

A is 72 inches long and 84 inches long. It is four inches longer but slightly narrower than a standard king bed. A California king is the longest bed and could accommodate individuals taller than 6 feet.
Split California King Sized Mattress

Split California King Size Mattress Dimensions

76" x 80"

76" X 80"

Bed for Two People

2 person

A split California king bed is 72 inches wide by 84 inches long. Split beds are perfect for couples sharing a bed without needing to compromise on comfort and firmness. The California king bed is great for people taller than 6 feet.

FAQS

Mattress Size Comparisons

The difference between a twin and a twin XL mattress is the length, the twin XL is 5 inches longer than the twin. Both the twin and the twin XL mattress are 38 inches wide, the twin XL is 80 inches long while the twin is 75 inches long. Twin mattresses are perfect for children and guest rooms because they are affordable and easy to move. The twin XL mattress is perfect for taller individuals, dorm rooms, or shared adult bedrooms because there is more leg room but the bed won’t take up much room.

The difference between a twin and a full-size bed is the width, a full bed is 16 inches wider than a twin. Both beds are 75 inches long, the twin is 38 inches wide, while the full is 54 inches wide. A full bed, or double bed, is the better option for couples and more sleeping space, but could still be too short for tall people. Twin mattresses are perfect individual sleepers like in children’s rooms, dorm rooms, or a guest bedroom. If you are looking for a longer bed, the best option would be a twin XL or queen mattress.

Our Full size means there is just one chamber, while our Double size means there are two air chambers in the mattress. The size will be the same for each mattress (about 54" wide by 75" long).

A queen mattress is 6 inches wider and 5 inches longer than a full-size mattress. A queen mattress is 60 by 80 inches while the full, also referred to as a double bed, is 54 by 75 inches. The queen bed has a noticeable amount of extra space to more comfortably fit a couple and taller individuals. However, both mattresses could be used for couples or individuals depending on room size and budget.

The difference between a queen and king bed is the width, a king bed is 16 inches wider than a queen bed. A king mattress is 76 by 80 inches while the queen mattress is 60 by 80 inches. King mattresses are the best option for couples who want maximum personal space while sleeping, couples sleeping with pets or children, or for large bedrooms. Queen mattresses are a great option for couples if restricted by room size or budget and individuals sleeping with pets or a child.

The king mattress is 4 inches wider and 4 inches shorter than a California king size mattress. A king mattress is 76 by 80 inches while the California king mattress is 72 by 84 inches. King mattresses are the widest mattress and can be used in most large rooms for couples. A California king is the longest mattress and could accommodate individuals taller than 6 feet. When choosing between the two mattresses it is important to consider the cost of accessories. A California king bed is less common making accessories typically more expensive.

The eastern king mattress is 4 inches wider and 4 inches shorter than a California king size mattress. The eastern king is another name for the traditional king size mattress measuring 76 inches wide by 80 inches long, while the California king mattress is 72 inches by 84 inches.

Understanding Split Beds

There are two versions of split king mattresses, both versions measure 76 inches wide by 80 inches long. The first type is a half-split king mattress or FlexTop, it’s split at the top but the feet area is connected. The other version is a full split king mattress with two separate twin XL mattresses side by side. Both types accommodate customizable comfort for each person depending on the desired level of firmness and comfort. Traditional king size bedding will fit a split king unless it is on an adjustable bed frame, in that case separate fitted sheets for the two mattresses are required.

A split queen mattress is two separate mattresses side by side, each measuring 30 inches wide by 80 inches long. Together the mattresses equal a traditional queen mattress size, 60 inches wide by 80 inches long. Split queens are for easy moving, individualized comfort in a shared bed, and adjustable bed frames. Sleep Number only offers split mattresses in King and California King size.

Yes, two twins XLs together is the same size as a king mattress. Twin XLs are 38 inches by 80 inches and king mattresses are 76 inches by 80 inches. Together the two twin XLs are the same size as a king mattress.

No, putting two twins together would be 16 inches wider and 5 inches shorter than a queen mattress. However, putting two twins XLs together are the size of a king mattress, 76 inches by 80 inches. If looking for a split queen bed, this would be two specialty mattresses measuring 30 inches by 80 inches.

What Size Bed Do You Need?

The best mattress size for couples is a king (76 inches by 80 inches) or a queen (60 inches by 80 inches.) King size beds provide more personal space and fit well in large bedrooms. Queen size beds are 16 inches thinner, removing some personal space but will work well in smaller bedrooms. To achieve personalized comfort, couples sometimes choose a split king or queen mattress which allows each person to pick their preferred firmness and support.

The best beds for tall people are the king, queen, or twin XL mattresses that measure 80 inches long. If you are taller than 6 feet 4 inches, a California king would be the best option as it is 4 inches longer than traditional mattress sizes (72 inches by 84 inches). These options would be better than a full size or twin bed that is only 75 inches long.

A twin bed is 38 inches wide by 75 inches long and would be suitable for toddlers, children, and high schoolers. If the child is tall and needs more leg room, a twin XL would be perfect as it is 38 inches wide by 80 inches long. Another option is a full-size, or double bed, measuring 54 inches wide by 75 inches long, there is more room for active sleepers and older children.

Recommended Room Size based on Bed Type

The minimum room size for a queen bed is 10 feet by 10 feet. A queen bed is 60 inches wide by 80 inches long, needing adequate space in the room for furniture, walking, or decorations. Queen beds typically require a bedside table on each side of the bed, which should be taken into consideration when choosing a bed size.

The minimum room size for a king bed is roughly 12 feet by 10 feet. A king size bed is 76 inches by 80 inches and needs sufficient space surrounding the bed for walking and furniture. Larger rooms will be required if wanting to fill the space with multiple dressers, seating, and furniture.

The recommended room size to fit two twin beds would be 10 feet by 10 feet. With a twin bed at 38 inches wide by 75 inches long, this would leave almost 4 feet between the two beds for furniture and walking space. If attempting to fit two twin beds in a room smaller than 10 feet by 10 feet, another option would be bunk beds.

On average, you need about 30 inches between a bed and wall for a comfortable walking path. This can be adjusted based on room size and preference, but designers typically will recommend a minimum of 30 inches.

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