A Guide To Bed Sizes And Dimensions: What Mattress Size Should You Buy?

mattress sizes
King mattress size(illustration): 76 inches by 80 inches


California King mattress size(illustration): 72 inches by 84 inches

California King

Queen mattress size(illustration): 60 inches by 80 inches


Full mattress size(illustration): 54 inches by 75 inches


twin xl mattress size illustration

Twin XL

twin mattress size illustration


Mattress Sizes Chart

Understanding Mattress Which Size Is Best For Your Space

SizeDimensions (IN)Dimensions (FT)Dimensions (CM)
King76” x 80”6.33 x 6.67193.04 x 203.2Shop
California King72” x 84”6 x 7182.88 x 213.36Shop
Queen60” x 80”5 x 6.67152.4 x 203.2Shop
Full54” x 75”4.5 x 6.25137.16 x 190.5Shop
Twin XL38” x 80”3.25 x 6.6799.06 x 203.2Shop
Twin38” x 75”3.25 x 6.2599.06 x 190.5Shop

Is a queen bigger than a full size mattress? How many people can sleep on a king size?

Find the answer to such questions as we take you through which mattress size is right for you and why. Each popular mattress size is made for unique sleeping and personal needs. To understand what dimensions suit your needs or which size will get you to that sweet spot every night, read this comprehensive mattress size guide.

Family on a Nectar King Mattress measuring 76” x 80” (standard king mattress size)

King Size Bed Dimensions: 76” X 80”

A King size mattress is 76 inches wide and 80 inches long (194 cm x 204 cm). It is big enough for you and your spouse to share the bed with a child or a pet. If you sleep with a partner then a King size bed is going to be one of the best choices from among the many standard bed sizes available. The only downside: The luxurious King size mattress may not fit in your bedroom (or up the stairs!). To know if King is the right size for you, compare it to other mattress sizes: King vs Queen, King vs Cal King, King vs Split King.

Best For

A couple who loves to stretch out and share the bed with a small child or a pet.

Room Size

The ideal room size for a King size mattress would be 13 feet by 13 feet up to 13 feet by 19 feet. King size is great for master bedrooms or the primary bedroom of the house.

person getting down from california king size bed. (Standard Cal king mattress size 72” x 84”)

California King Size Bed Dimensions: 72” x 84”

A California King size mattress is 72 inches wide and 84 inches long (183 cm x 213.5 cm). California King size beds are best for individuals who are taller than 6 feet and need the extra length to sleep comfortably. For bedrooms that are longer than they are wide, a California king bed size is perfect since they are 4 inches narrower compared to King size mattresses. A Cal king is also a great choice for pet parents whose pets like to sleep at the foot of the bed. To know if Cal King is the right size for you, compare it to other mattress sizes: King vs Cal King, Cal King vs Queen.

Best For

Tall couples who love to stretch out, and maybe have a pet join them.

Room Size

A long but narrow bedroom, 10 feet by 12 feet and up to 13 feet by 19 feet, can hold a California King bed.

a white dog sleeping on queen bed measuring 60“ x 80” (standard queen mattress size 60“ x 80”)

Queen Size Bed Dimensions: 60” x 80”

A Queen size mattress is 60 inches wide and 80 inches long (167 cm x 203.5 cm). A Queen size bed is the most popular choice among couples who sleep together. It can also comfortably accommodate a child and a pet with a single adult. A Queen bed size is also a great option for couples who like to have more floor space in their bedroom.
A Queen size mattress can be used by individuals who are tall and prefer sprawling out or lounging in bed. From the different bed sizes available, Queen size mattresses are the most purchased size as they are compact yet spacious. To know if Queen is the right size for you, compare it to other mattress sizes: Queen vs King, Queen vs Cal King, Queen vs Full.

Best For

Couples, a young child with a parent, or a single person with a dog.

Room Size

For a Queen mattress size, the recommended room size can vary from 10 feet by 10 feet, up to 10 feet by 14 feet.

Young couple on full size bed. (standard full size mattress size is 54” x 75”)

full Size Bed Dimensions: 54” x 75”

A Full size mattress is 54 inches wide and 75 inches long (134.5 cm x 203.5 cm). Also known as double beds, Full size mattresses are best for singles! They are 5 inches shorter and 6 inches narrow compared to a Queen size mattress.
Full size mattresses are best used by single adults or students who live in studio apartments or dorm rooms. If there are two people in the same bed, you are better off bumping up to a Queen or King size mattress. To know if Full is the right size for you, compare it to other mattress sizes: Full vs Queen, Full vs Twin XL, Full vs King.

Best For

Teenagers, a child with a parent, or a single person with a dog.

Room Size

A bedroom should be at least 9 feet by 9.6 feet. Full bed size is ideal for guest rooms, dorm rooms, or studio apartments.

Twin XL mattress with bed frame (standard twin XL mattress size is 39” x 80”)

Twin XL Size Bed Dimensions: 38” x 80”

A Twin XL mattress is 38 inches wide and 80 inches long (96.5 cm x 203.5 cm). A Twin XL bed is best for those who would go for a Twin due to limited space, but enjoy the extra length that a Twin XL gives. A Twin XL is 5 inches longer than a Twin size mattress. A Twin XL mattress is the best choice for fast-growing teens or adults who prefer compact sleeping spaces. To know if Twin XL is the right size for you, compare it to other mattress sizes: Full vs Twin XL, Twin XL vs Queen, Twin vs Twin XL.

Best For

Young children up to 12 years old, young adults, college dorm rooms.

Room Size

A bedroom should be at least 8 feet by 10 feet in size. A Twin XL bed can fit in the children’s bedroom or in a dorm room.

single vs twin bed

Twin Size Bed Dimensions: 38” x 75”

Twin size mattresses are 38 inches wide and 75 inches long (96.5 x 188 cm). Twin size mattresses are meant for children who are growing out of their cribs. They can be used on a bunk bed with similar dimensions or on a small bed meant for children. You can also use safety rails on the side of the Twin bed so your child won’t roll off the bed.
If you feel that your child will outgrow a Twin bed size very quickly, you can consider buying a Twin XL mattress which is 5 inches longer than a Twin size mattress. To know if Twin is the right size for you, compare it to other mattress sizes: Twin vs Twin XL, Twin vs Full.

Best For

Children 2-12 years old, bunk beds.

Room Size

A bedroom should be at least 7 feet by 10 feet in size. If you are putting two Twin beds together in a room, it should be 9 feet by 9 feet.

Which mattress size is right for me?

There are many other factors that can affect which mattress size is the best for you. Your budget, the size of your bed, and how many people will share the bed are important considerations. If you are still unsure you can use our trial period of 365 nights to find the perfect fit for you! Read on to see what other factors to look at before making your decision.

Bed Size

Not measuring your bed correctly can be one of the biggest mistakes you can make before purchasing a mattress. Most standard US bed sizes are the same size as the mattress or are .5 inches longer. This can change depending on the design or on the brand that you are purchasing your mattress and bed from.

Here’s a list of the different bed sizes available in the market

King Size Bed76.5” x 80.5” | 194.5 x 204.5 cm
Cal King Size Bed72.5” x 84.5” | 184 x 214.5 cm
Queen Size Bed60.5” x 80.5” | 154 x 204.5 cm
Full Size Bed54.5” x 75.5” | 138.5 x 192 cm
Twin XL Size Bed39.5” x 80.5” | 100 x 204.5 cm
Twin Size Bed39.5” x 75.5” | 100 x 192 cm

Measuring your bed before buying the mattress is an important step in the process.
If you purchase the bed and the mattress from the same brand, this may not be a problem. Take a look above at the mattress size chart to see the difference between us and other brands.

Who’s using the mattress?

If you are confused about the different sizes of beds or mattress sizes to choose from, follow these guidelines.

young woman relaxing with coffee on nectar mattress and nectar pillow

For single adults

The best options are a Full, a Queen, or a Twin XL mattress depending on personal preferences or the space available.

young couple enjoying on Nectar mattress

For Couples

A Queen, a King, or a California king mattress can work wonderfully. Depending on how much space each individual wants or how tall the couple is, one of the three sizes can comfortably accommodate two people.
A smaller size, such as a Full size mattress, can be removed from the list.

young kid playing on bed

For Children

Depending on the age or the height of your child you can choose between a Twin, a Twin XL, or a Full size mattress. A Twin or Twin XL mattress can be used by children growing out of their cribs whereas a Full size mattress is great for children who are in their late teens or early adulthood.

family of four enjoying on bed

For Adults with Children or Pets

If you are parents to either a child or a pet and want to share the bed with them, a King or a Cal King size are the best options. For single parents, a Queen or a Full size mattress can comfortably fit both you and your child.


Location of the Bedroom

Transporting mattresses can be a challenge, especially through narrow staircases or through small doorways. Check if your bedroom is easily accessible or not. King size or California King size mattresses are bulky and heavy making them hard to transport between rooms or houses. Queen and smaller sizes are easier to move around, even in small spaces. Consider where your bedroom is before making the final decision.

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A woman hand set up bed sheet after washing it
Vector 7


The rule of the thumb is that the bigger the mattress the more expensive it will be. However, this can change depending on the brand, the material, and the technology behind it.
Generally, a spring mattress is cheaper than memory foam or latex mattresses because latex and memory foam mattresses are more durable and support the sleeper’s body better. If spine health is one of your concerns then you should check out our range of memory foam mattresses and pillows.

Undertaking bed size comparison is a tricky task and we hope this mattress size guide helps you make the right choice.

Mattress Size in Feet

King Size Bed Dimensions6.33 x 6.67
Cal King Size Bed Dimensions6 x 7
Queen Size Bed Dimensions5 x 6.67
Full-Size Bed Dimensions4.5 x 6.25
Twin XL Size Bed Dimensions3.25 x 6.67
Twin Size Bed Dimensions3.25 x 6.25

Other Mattress Sizes

Crib Mattress size (28” x 50”) illustration

Crib Size Bed Dimensions: 28” X 50” | 2.3 X 4.6 feet

Crib size mattresses are 28 inches wide and 50 inches long (70 X 127 cms). A cribs size mattress is the smallest mattress size available in the market and is meant primarily for toddlers and small children. Because of its small dimensions, it can easily fit into a children’s room. It can also be placed in the same room as yours if the bedroom is large.

Small Single Mattress size (30” x 75”) illustration

Small Single Bed Dimensions: 30” X 75” | 2.6 X 6.2 feet

A small single bed is a narrow long bed which is 30 inches wide and 75 inches long (75 X 190 cms). It is a good fit for children’s beds that are narrow with extra length for tall teens. They can also be used for the spare room in your house and can be used to set up a lounging space in the house.

Olympic Queen Mattress size (66” x 80”) illustration

Olympic Queen Size Bed Dimensions: 66” X 80” | 5.5 X 6.6 feet

An Olympic queen size mattress is 66 inches wide and 80 inches long (168 X 201 cms). It is wider than a standard Queen size mattress by 6 inches. Because it is an uncommon size, accessorizing it or finding a bed frame for it can be challenging. This size is a great choice for couples who want bigger space than a queen offers but have a relatively smaller bedroom. This size lies somewhere between a king and a queen and is a good fit for the master bedroom of the house.

Split King Mattress size (28” x 50”) illustration

Split King Size Bed Dimensions: 38” x 80” | 3.25 x 6.67 feet

A Split King mattress is 38 inches wide and 80 inches long individually (99.06 x 203.5cms) and 74 by 80 inches (183 cm x 213.5 cm) when placed together. It is called a split king as it is the same dimensions as a king size mattress, but is split in the middle to allow couples with different sleeping preferences to sleep together. It is used with an adjustable bed frame and can be installed easily. It limits motion transfer to a very large extent, helping light sleepers fall asleep easily.

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