Mattress Sizes and Dimensions

Updated on December 13, 2019 While all product recommendations are chosen independently, we may receive compensation for purchases made through our site. Learn more about our affiliate program here.

Size matters when it comes to your mattress. Its dimensions will affect your sleep quality and your design aesthetic. Considering a simple set of factors will help you choose a size that will give you a great night’s sleep and also look good in your home. You’ll want to think about who is sleeping in the bed (don’t forget about potential visitors such as kids and pets), the dimensions of your room, and how long you plan to keep the mattress. This mattress size chart guide will walk you through the various mattress sizes that are available and what to think about when deciding which would work best in your situation. Then you can easily determine the size that best suits your own sleep and space needs.

Standard Mattress Sizes and Dimensions


DIMENSIONS: 38” x 75”

BASICS: A twin mattress, also called a single, is the smallest mattress available.

CONSIDER: Twin mattresses work well for one child or a single adult – but keep in mind it would be too short for a taller person and your child might soon want more sleeping space. Twin mattresses work best in smaller areas such as guest rooms and children’s rooms. They also tend to fit well with bunk beds and daybeds.


DIMENSIONS: 38” x 80”

BASICS: A Twin XL mattress sleeps one child or adult, with the same width as a twin and five more inches of length.

CONSIDER: Twin XL mattresses are a great option for a single adult (or taller child) with limited space. With its additional length, the Twin XL is a good choice for guest rooms, dorm rooms or studio apartments.


DIMENSIONS: 53” x 75”

BASICS: Also called a double, a full mattress provides more width but the same length as a twin.

CONSIDER: A full mattress has 16 inches more width than a twin, but that is just barely enough to accommodate two adults. And its length means it would be a tight fit for taller people. A full is best suited to a single sleeper who has a slightly larger rooms. It can also be a smart choice for a sleeper who snuggles with a pet or a child who often calls in Mom or Dad for a nighttime cuddle. A full mattress can work well for guest rooms and teenagers.


DIMENSIONS: 60” x 80”

BASICS: The most common mattress size, a Queen mattress can comfortably accommodate two adults.

CONSIDER: A queen mattress provides more sleeping space than a full mattress and leaves more living space than a king mattress, making it an ideal fit for many situations. Keep in mind that a queen works best in a larger room, typically at least 10’ x 10’. And though it does provide plenty of space for two adults, it doesn’t leave extra room for kids or pets.


DIMENSIONS: 76” x 80”

BASICS: A king mattress provides two sleepers with the space equivalent to each having their own twin mattress.

CONSIDER: If you have a lot of floor space – ideally a room at least 12’ x 10’ – and need a lot of sleeping space, a King mattress could be a good solution. It provides plenty of room for two adults to sleep comfortably, with extra room still available for a pet or child. When measuring your bedroom, take your bed frame and nightstands into consideration.

BED TYPE: California king

DIMENSIONS: 72” x 84”

BASICS: The longest mattress commonly available, the California king mattress is a great option for a couple with taller sleepers.

CONSIDER: The California king mattress is more narrow than a stand king mattress, but it provides four additional inches of length. Its 84 inches translates to 7’, making the California king mattress ideal for the tallest sleepers. Like a standard king, it still provides enough space for two adults in additional to a pet or child.

BED TYPE: Crib mattress

DIMENSIONS: 28” x 52”

BASICS: A crib mattress is the foundation for your baby’s sleep.

CONSIDER: With any luck, your baby will sleep (preferably through the night) on a crib mattress. To decrease the risk of SIDS (Sudden Infant Death Syndrome) and suffocation, this mattress should be very firm and fit into the crib with no gaps.

BED TYPE: Toddler mattress

DIMENSIONS: 28” x 52”

BASICS: Typically the same size as a crib mattress, toddler mattresses are slightly softer.

CONSIDER: When a child has outgrown the crib, some parents choose to transition into a toddler bed. This bed is usually the same size as a crib, often low to the ground and perhaps with safety rails. Now that the child has more strength and mobility, it is safe to use a softer mattress.

Specialty Mattress Sizes and Dimensions

BED TYPE: RV mattress

DIMENSIONS: 48” x 75”

BASICS: With its narrow profile, the RV mattress can be a good fit in a tight spot.

CONSIDER: The RV mattress, also called a three-quarters mattress, cuts five inches off the width of a full. This can be a great space saver in smaller spaces like motorhomes or trailers.

BED TYPE: Texas king

DIMENSIONS: 80” x 98”

BASICS: Though it’s not commonly available, a Texas king mattress is an option for sleepers who need the most sleeping space.

CONSIDER: For a couple with ample room that needs a significant amount of sleeping space, it could be worth looking for a Texas king mattress, also called an athletic king. Keep in mind that linens would also be difficult to find and may require custom orders.

BED TYPE: Olympic queen

DIMENSIONS: 66” x 80”

BASICS: An olympic queen mattress, also called an expanded queen, is 10 percent wider than a standard queen mattress.

CONSIDER: Also more difficult to find, the olympic queen mattress is a good middle ground between a standard queen and king mattress. If your room can’t quite handle the size of a king mattress but you need a bit of extra space when you sleep, an olympic queen could be the perfect option.

That’s all you need to know. With such a wide variety of sizes available, choosing the right mattress size can be daunting. But by keeping a few key factors in mind, you can easily select the size that is the perfect fit for you and your home.