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Mattress Sizes - The Ultimate Guide to Mattress Dimensions

Standard Mattress Sizes to Help you Choose the Right Size Mattress

Are you ready to buy a mattress for yourself or a member of your family? There are many factors to consider when making such an important purchase. One of the most important choices is mattress size. There are many different mattress sizes available, and it’s important to choose the right one for your needs.

U.S. Mattress Sizes and Dimensions

  • Crib: 28” x 52”
  • Toddler: 28” x 52”
  • Twin: 38” x 75”
  • Twin XL: 38” x 80”
  • Full/ Double: 54” x 75”
  • Queen: 60” x 80”
  • King: 76” x 80”
  • California King: 72” x 84”
  • Mattress Size Chart

    Mattress Sizes

    When it comes to mattresses, size really does matter. The size of your mattress will determine how it fits in your bedroom and how many people can sleep comfortably on it. Does your partner toss and turn all night, requiring extra space? And what’s the right size for small children — will they grow out of their mattress too soon?

    This article will help answer your questions and tell you everything you need to know about mattress sizes. You won’t need to lose sleep deciding on the best mattress sizes for you and your family.

    Crib Mattress: 28” x 52”

    The crib mattress is for the smallest and newest humans in your family. Measuring 28-inches wide and 52 inches tall, the crib mattress dimensions are amply sized for a baby during the first 18 months. A key feature of the crib mattress is the extra safety it provides. A properly sized crib mattress fits snugly inside of a framed structure (the crib) and leaves no more than two finger widths of free space between the mattress and the crib wall. Any more than that can increase the risk of suffocation. The firmer the mattress, the better, as overly soft ones can be hazardous to a baby’s breathing when rolling over.

    Once the mattress is fitted in the crib frame, it’s time to choose the right bedding. For the best and safest sleep, babies should not use blankets or other extra bedding for the first 12 months of life. The crib should contain only the baby, a well-secured fitted sheet, and the mattress. To protect the mattress from diaper drips and other messes, many parents opt for waterproof and antimicrobial fitted sheets. To make sure the tot does not get too cold, an extra layer of clothing can be added. A breathable mattress can also help keep temperatures within a comfortable range.

    Crib mattresses are the same size as toddler mattresses and often come double-sided: a firm side for babies, and a softer side for toddlers. Some cribs have removable walls and can be lowered to form a toddler bed.

    Toddler Mattress: 28” x 52”

    After graduating from the crib (also known as a walled fortress), it’s time for a child’s very first real bed! Measuring at 28 inches wide and 52 inches long, the toddler size mattress dimensions are exactly the same size as a crib mattress. It’s ideal for individual toddlers and young children. Toddler mattresses are no longer surrounded by walls, though some parents install small railings to keep a rolling toddler from falling from the bed.

    The toddler mattress is usually slightly softer than the firm crib mattress, offering a bit more comfort as the child grows. Protective mattress pads are very popular as children enter the potty-training phase and help keep the mattress in good condition.

    How do you know when your child is ready to graduate from a crib to a toddler bed? Often, you’ll know it’s time to transition when your toddler learns how to escape the crib! This usually happens at around 18 months to 2 years of age. Children can generally continue to sleep on their toddler mattress until they reach 4 or 5 years of age. Toddler mattresses are small, making them a great choice for smaller rooms and rooms with other beds. Their size also makes them easy to move.

    Some parents may choose to skip the toddler mattress and move their child directly into a twin mattress. If you have the space for this (for example, if your child doesn’t share a room), then it can be a big money-saver, as you won’t have to buy a new mattress as the child grows. For those low on space, a toddler mattress is easy to fit into any room, store away, and move from place to place.

    Twin Mattress: 38” x 75”

    Twin size mattresses are the smallest of the standard size mattresses. They are designed for single sleepers of average height. With mattress dimensions of 38” x 75”, they are ideal for individual adults and children who don’t need a lot of space to move around. This might not be the ideal bed size for the tossers, turners, sprawlers, and rolling sleepers. Twin is one of the most popular mattress styles and has some great features that go beyond simply sleeping. The size and price point make the twin mattress a great choice for many people.

    Being the smallest of the standard mattress sizes, the twin mattress is often used for furnishing a child or teen’s room. Bunk beds also use twin-size mattresses, which is a great space-saver when siblings are sharing a bedroom.

    Are you in college or renting a small space? There’s no better way of maximizing your living space than choosing a twin bed. The small size makes moving simple, as twin mattresses are light and easy to haul. This makes them a favorite of young adults who find themselves moving often, as it can easily fit in a van, truck, and be lugged up and down a flight of stairs. A twin mattress can even double as a daybed or couch, adding versatility to a small living space.

    Is this the right mattress size for your needs? The twin mattress is perfect if you don’t need to share the bed. Try as you might, the twin is almost unbearable when sleeping two adults, and even two children may likely feel like sardines in a can. Taller people (over 6 feet) might also find this bed a bit too short for their needs.

    Versatile, small, and comfortable, the twin mattress is a practical and economical choice for those seeking to maximize their room space.

    Twin XL Mattress: 38” x 80”

    If you want the benefits and attractive price of a twin mattress, but you’re just a bit too tall to find it comfortable, the twin extra-long (XL) mattress is for you. Measuring at 80 inches long, this mattress is ideal for taller, non-active sleepers. The dimensions are the same as the standard twin, but there are an additional 5 inches added to the length. Any taller person will tell you how annoying it is to have your feet hang past the foot of the bed, and the twin XL solves this problem! The extra length provides a comfortable space for those over 6 feet tall while providing all the benefits of the standard Twin.

    Twin XL mattresses are the top choice for college students. Most dorm rooms, being small and shared, necessitate a smaller bed to maximize usable room space, hence why the twin XL mattress makes the most sense.

    This mattress size is the most affordable option for tall adults and youths that don’t move a lot while sleeping. This might not be the ideal bed for those who toss, turn, and roll around in their sleep. The twin XL is longer than the standard twin size, but it isn’t any wider, so those who need more space will want to opt for something larger, such as the full mattress.

    Full / Double Mattress: 54” x 75”

    The full mattress is designed for single sleepers who prefer ample space to move around in bed. Also known as a double mattress, the full-size mattress is a comfortable choice for children, teens, and adults. It is the same length as a twin mattress, but 6-inches wider. Similar to the twin, the full might be too short for taller teens and adults.

    Single sleepers of average height will feel right at home in a full bed. There is more than enough width for finding the perfect sleeping position, even fully sprawled out. This is often the bed of choice for parents shopping for their kids and teens.

    Until the queen mattress became popular, the full mattress used to be the standard choice for couples in America. Today, almost all couples will opt for the queen, since it is only slightly more expensive. That being said, it is still possible to fit two adults in a full bed, but it is generally a snug fit. For couples who enjoy camping, the compactness of the full size makes it ideal as an RV mattress. It is also becoming a more popular choice for children, as it provides room for parent and child at tuck-in time and gives the child plenty of room to grow.

    The full mattress isn’t ideal for active sleeping couples, tall people, or infants. At 54-inches wide, this gives couples only 27-inches of space each, so there’s not much space to move around. Tall people might also have issues with their feet hanging off the bed unless they sleep at an angle, from corner to corner, as the full-size mattress is only 74-inches long.

    The full mattress is a great choice for kids, teens, and single-sleeping adults of average height who’d like a bit more sleeping room than a twin size can provide. Although it takes up a bit more space than a twin, many find the extra sleeping space worth it.

    Queen Mattress: 60” x 80”

    The queen size mattress is the most popular of all mattress sizes. Measuring 60” x 80”, it is a spacious yet versatile option. The queen offers couples ample sleeping space and comfort, while still fitting nicely in almost any bedroom. It is easy to see why this is the first choice and most common size found in master bedrooms today.

    Queen mattresses are designed to be the perfect size for two people. It accommodates people who are tall, short, deep sleepers, and tossers and turners. Queens also rank number one for cost-effectiveness, as they are often the most reasonably priced in terms of bed space.

    The queen is a great choice for couples, guest rooms, individuals who love a spacious bed, and people who plan to share a bed soon. Queen beds are also popular among parents and pet owners, as they can easily welcome young ones for bedtime stories, or furry friends for snuggling. Most bedrooms will easily fit a queen mattress with room to spare. Most hotel rooms and guest bedrooms are furnished with a queen size mattress, as they are able to accommodate almost any guest.

    Queen beds may not be the ideal choice for people with small rooms, individual sleepers who don’t need much room to move, and children. Although the most affordable for the bed space, single people may be smart to opt for something smaller — especially if floor space is a concern.

    Queen-size mattresses are, without a doubt, the most popular mattresses in master bedrooms. Being a comfortable size for couples, cost-effective, and an easy fit in most bedrooms, it is clear why the queen remains the gold standard of mattresses today. Shop for the best queen mattress with no pressure support.

    King Mattress: 76” x 80”

    This mattress is called king for a reason — you’ll likely feel like royalty when sleeping on this wide, spacious mattress. The amount of extra space on a king-size mattress — even when sharing — can be considered something of a luxury. The king is a whopping 16” wider than the queen (by comparison, the queen is only 6” wider than the full), typically making it the best mattress for couples who really value their personal space or the whole family on movie nights. If you have the square footage and budget to accommodate a king bed, you’ll enjoy the most spacious sleep environment on the market.

    A king mattress is a great option for very active sleepers, as there is more than enough space to move, roll, and sprawl. It is also an ideal solution if your partner is a light sleeper, as one partner can leave or enter the bed without disturbing the other. While it is the most expensive of the standard sized beds, many people find that the extra comfort is completely worth the price. When investing in something as important as a bed (which could determine your comfort for decades to come), splurging for maximum bed space can be a wise decision.

    The king mattress is not ideal for anyone with an average or small room. A king will take up a large amount of space, so be sure and plan accordingly. Don’t let the lure of luxury lead you to purchase a mattress that won’t even fit in your room! Also, king mattresses are a pain to move in and out of the house. If you’re planning on moving in the near future, consider waiting to buy that king until you get to your new property.

    The king mattress takes the cake for comfort and space and is considered a luxury in the mattress world. If you are looking for a mattress with supreme comfort and you have the space, the king mattress is a great choice.

    California King Mattress: 72” x 84”

    The California king mattress, also known as the Western king, is made for the tallest people — those who have endured a lifetime of feet dangling off the edge of the bed. Slightly narrower than the standard king, the California king measures 72-inches wide and 84-inches long, adding 4 inches of length while losing 4 inches of width. Still plenty wide for two people, this is the longest of the mattress sizes.

    This mattress is ideal for tall sleepers, whether they share a bed or not. Being 84-inches in length, the California king is the only option for those who don’t fit on twin XL or queen mattresses. Tall couples who are active sleepers will also be very comfortable on this mattress.

    The California king is a large, spacious bed, so room size must be considered. Being slightly longer and thinner than the traditional king-size mattress, it may actually fit more comfortably in your room than a standard king. For this reason, those who are not tall might also opt for a California king, as it’s a foot wider than the Queen, and may end up saving space in your bedroom.

    While great for some, the California king is not an option that many will choose. It is often the most expensive mattress option — and you have the ongoing costs of non-standard sheets and blankets to consider, as well. However, the extra length of the California King provides a great sleep environment for tall individuals and couples while providing ample sleep space for active sleepers.

    Mattress Thickness

    Scale showing Purple mattress thickness

    Once you have decided on the perfect length and width of your mattress, you may be asking: What is the ideal mattress depth? You might think that a thicker mattress is always an indicator of comfort, but that’s not always the case. Based on your specific sleep needs, the thickness of your mattress will likely play an important role in getting a good night’s sleep — but don’t forget that the mattress materials are just as important, if not more so!

    Mattresses can range anywhere from a slim 5-8 inches of thickness, to a super thick 20+ inches. The general “sweet spot” for comfort and durability is anywhere between 9-13 inches. This range typically provides an ideal balance of comfort, durability, and lift. While thin mattresses generally provide less comfort, after about 13 inches in thickness, comfort does not significantly increase.

    Slim mattresses are generally ideal for small children and infants, people with specific mobility needs, and for beds that are moved frequently. Because of their smaller size, it is common for slim mattresses to have more firmness and less plush, making them a decent choice for lighter bodies. With less lift, beds with slim mattresses are also easier to get in and out of, making them the top choice for people with mobility needs.

    Ultra-thick mattresses are good for heavier people, as they distribute the weight over a greater amount of mattress, reducing wear-and-tear and increasing the lifespan of the mattress. If you enjoy a tall bed, a thick mattress comfortably set on box springs can also help you get a nice lift. It must be noted that it can often be a challenge to find bedding for a super thick mattress, as most linens are designed for the standard 10″-14″ mattress thickness.

    How Thick is the Purple® Mattress?

    The Purple® MattressDepth
    The Purple® Mattress9.25”
    Purple® Hybrid11”
    Purple® Hybrid Premier 3"12”
    Purple® Hybrid Premier 4"13”

    Purple offers a range of depths to our mattresses, so you can enjoy perfect comfort according to your body type and personal preference. The Purple® Hybrid Premier allows you to customize the thickness of the Purple® Grid for the perfect level of comfort and support.

    Which Mattress Size is Right for Me?

    Mattress sizes for people

    When it comes to buying a mattress, choosing the right size can affect your level of sleeping comfort for years to come. By considering these important factors, you can feel confident that you are making the best decision for your needs.

    Living Space and Bedroom Size

    List of thing to think about when considering living space and bedroom size

    As you shop for a mattress, it’s easy to get sucked into dreams of a large, luxurious bed. But keep in mind that your mattress needs to fit comfortably in your room. Before you get too carried away, grab the measuring tape and ask these questions:

    • How big is your bedroom?
    • How much bed space vs. usable room space makes sense for you?
    • Will you have to move furniture to fit the mattress?
    • How much space do you want on either side of the bed?
    • How will you physically get the mattress into the room?
    • Are you planning on moving anytime soon?

    Once you get an idea of what your current space can hold, you’ll be able to choose the right size mattress. Be sure to think about your future plans!


    The next thing to consider is how many people will be sleeping in the bed. A single person? A couple? Need extra room for kids and pets?

    A single person of average height might consider a full mattress, while a couple would likely seek out something bigger, like a queen or king. It is also helpful to think about whether there are any co-sleepers, like children or pets that may spend time in the bed. Even if there aren’t any now, a king-size bed could be a good option for a couple hoping to have kids and pets in the future.

    Sleeping Habits

    In order to get a good night’s sleep, you need enough space to stretch and relax. Active sleepers who change position, sprawl out, and move around need more space than some mattresses can offer. Active sleeping couples might opt for a king mattress to fit their needs, while close-sleeping, non-active couples might prefer a queen.

    Size of the Sleeper

    A sleeper’s size often determines which mattress is the right choice. Tall people may find many standard mattresses to be too short. When shopping for a child, make sure to choose a mattress that won’t be outgrown too quickly. Otherwise, you may find yourself buying a toddler mattress, a twin, and then a full — all in the span of a few short years.


    One final thing to consider is the money you’ll spend when buying a mattress and accessories. A queen is the most common and price-effective mattress. Along with the initial mattress purchase, queen accessories (bedding, bed frame, etc.) will be easier to find and less expensive than California king accessories. A twin bed might be the least expensive, but it can easily be outgrown. If the sleeper finds themselves with a sleeping partner, the twin may prove an uncomfortable choice.

    Mattress Sizes and Dimensions

    As you explore the world of mattresses, keep in mind the core components of your search: mattress dimensions, thickness, mattress types, and price. Mattress dimensions vary greatly and can certainly have an impact on your sleeping quality, your room space, and bank account.

    It’s true that the average-sized among us will have the easiest time finding a comfortable sleep space, but there are great options for big and tall people, too. Just remember, finding the right mattress size takes a bit of time and effort, so make sure to choose a mattress from a company that lets you take a sleep trial of at least 90 days before committing to a purchase.

    There are plenty of factors that play a role in choosing the right mattress size, but the most important is your comfort! Your mattress is going to be with you for years to come, so make choosing the mattress size a priority so you can get the great night’s sleep you deserve. No matter if you’re tall or short, sleeping together or alone, there is a mattress size for you.

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