Choosing the right size from a wide range of options can be difficult, especially when there are sub-categories like mattress thickness that add an extra layer of consideration. With very little difference in dimensions between certain sizes and variations in thickness, getting the right fit for yourself can be a daunting task.
The size of your bedroom and your budget are key factors in your decision-making process when looking for the ideal bed size. We will discuss the different mattress sizes available and the recommended room size for each of them to help you choose the most-fitting mattress size.

Minimum recommended room size: 12 feet by 12 feet.
The California king size is one of the longest standard mattress sizes available. While narrower than a standard king, the extra length of a California king makes it suitable for tall sleepers.
California king beds can accommodate two sleepers comfortably and sometimes an extra sleeper as well, like parents co-sleeping with their child. This makes it a good choice for families.
The California king mattress may also come with the split option. In this style, the California king mattress is split into two equal parts, to provide for partners with different mattress preferences and work with adjustable beds.
California king beds work well for tall sleepers—see our California king vs standard king comparison to understand the 4-inch trade-off between width and length.

Minimum recommended room size: 12 feet by 12 feet.
Sleeping on a king size bed is sleeping in luxury. There is enough room for two sleepers to sprawl and sleep in their own space. It provides 4 inches of extra width than the California King, but it's 4 inches smaller in length.
King mattresses are the widest available standard size, making it a good choice for families— if parents want to co-sleep with their children, this size can accommodate them.
The king size also comes with a split option; the split king is really two twin XL mattresses placed side-by-side.
The split king mattress serves couples with different mattress preferences, so in one bed they can have two different mattresses to suit individual needs. This style is also a good fit for adjustable beds with split-side functionality.

Minimum recommended room size: 10 feet by 10 feet.
A queen size mattress is popular for couples who don’t require too much space, or for a single adult preferring extra space to sprawl out while sleeping. The bed conveniently fits into almost any room and can readily accommodate more than one sleeper.
Others may prefer a king for themselves but have a queen in their guest bedroom, comfortably accommodating extra sleepers in the house for a few nights.
The queen size mattress also comes in a split queen option. In this style, the queen size is split into two equal halves to provide for couples who have different mattress preferences; so while sharing the bed, they can have a mattress suited to their personal preferences.
A queen size mattress is popular for couples who don’t require too much space. Many couples debate between queen vs king mattresses—our detailed comparison can help you decide which offers better value for your bedroom size and budget.

Minimum recommended room size: 9 feet 6 inches by 10 feet 6 inches.
A full-size mattress is best suited for a single sleeper. For couples, a full size mattress might not be a good choice for a comfortable sleep.
However, for an individual, this provides enough space to sleep comfortably and also fits into most rooms without making it look crowded. This size can also serve as a good option for a spare bed.

Minimum recommended room size: 9 feet 6 inches by 10 feet 6 inches.
This size is 5 inches longer than the standard twin size, making it a preferred choice for taller individuals. The twin XL size is always a good option to accommodate extra guests on short notice.
Since they don’t require much space and are less expensive than a queen or a full, it won’t be difficult to have one as a spare bed.

Minimum recommended room size: 7 feet by 10 feet.
The smallest of all standard sizes, this is one of the most common beds available. The twin size mattress is good for children and teens alike, accommodating children in their growing stages.
However, a twin or single size mattress may not be a good fit for a full-grown adult. It is a good size to fit into smaller rooms, and ideal for bunk beds, too.

① Alaskan King: Minimum recommended room size: 16 feet by 16 feet.
The Alaskan king mattress is one of the largest mattress sizes available, measuring 9 feet on all sides to form a giant square space. This massive mattress provides ample space for multiple sleepers, serving as the perfect family bed. It's also excellent for those who enjoy a luxurious, spacious sleeping experience.
However, due to its size, it may be challenging to find bedding accessories and furniture to accommodate an Alaskan king mattress. This size is not widely available and often requires custom ordering from a manufacturer.
② Texas King: Minimum recommended room size: 12 feet by 14 feet.
The Texas king mattress, also known as the “grand king,” measures 80 inches wide by 98 inches long. This size is 4 inches wider and 18 inches longer than a standard king mattress, providing extra room for taller individuals or those who want additional sleeping space.
Like the Alaskan king, the Texas king may require custom bedding and furniture due to its non-standard dimensions. This size is not as widely available as standard mattress sizes and may come with a higher price tag.
③ Wyoming King: Minimum recommended room size: 12 feet by 12 feet.
The Wyoming king mattress is another oversized option, measuring 7 feet on all sides.
This mattress size offers a square sleeping surface, which can be ideal for couples who want equal space on both sides of the bed. The extra foot room can also be great for taller sleepers or those who want space to fold an extra blanket at the foot of the bed.
④ Olympic Queen: Minimum recommended room size: 10 feet by 10 feet.
The Olympic queen mattress is six inches wider than the standard queen size and provides enough room for a couple to sleep comfortably. It's one potential in-between option for those debating between queen and king mattresses.
If your room is not big enough to accommodate a king, but you need more space for sleepers, then this Olympic queen size fits the bill. However, the Olympic queen size is meant for RVs and camper trailers and are more commonly seen inside mobile homes.
⑤ Full XL: Minimum recommended room size: 9 feet 6 inches by 10 feet 6 inches.
The full XL size has an extra 5 inches in length than a standard full. The extra legroom makes it a good fit for taller individuals sleeping by themselves.
It can also be a good choice for a spare bed in your guest room That said, some hosts prefer to offer a standard queen to accommodate couples.
⑥ Small Single: Minimum recommended room size: 7 feet by 10 feet.
Single mattresses and twin mattresses have the same dimensions, so these terms are often used interchangeably. However, the “twin” size is much more common nowadays, so if you have your eye on a single bed, a twin is just what you need.
⑦ Crib: A crib mattress is approximately 6 feet by 4 feet and only meant to fit inside a crib.
The standard crib size is regulated by the federal government for safety reasons. So it's pretty easy to find crib sheets that fit your mattress, as long as the crib mattress you choose is up to the current standards.
A crib mattress should not be more than 6 inches thick. Ideally a crib mattress should also offer a firm feel to support an infant's body.