Mattress Dimensions

Mattress Dimensions for Everyone in Your Household

When you set out to buy beds for your family, it’s hard to know what size mattresses to choose. You want your young kids to sleep comfortably but have enough space in their rooms to play. You want to make sure your quickly growing teens don’t outgrow their new beds too quickly. And you want your spouse to have plenty of room next to you in bed (especially if he’s a kicker).

Knowing the Right Mattress Dimensions For Your Family

The bed sizes most commonly available are a twin, twin XL, full, queen, king, and California king. We’ll go over the mattress dimensions for each size and tell you how to decide which ones are right for your family members.

Twin Beds 39” x 75”

Twin beds or “single beds” are what most parents buy for their school-aged children. While the transition to a toddler bed from a crib is drastic, a child transitioning from a toddler bed to a twin bed needs more room and can safely sleep on a more elevated surface without bars (although some parents choose to use a guard rail in a twin bed). The mattress dimensions of a toddler bed vs. a twin bed are 27”x 52” vs. 39”x 75”.

Twin mattresses are convenient because they fit well in smaller bedrooms and can be used in bunk beds or trundle beds – perfect for kids who enjoy sleepovers. You can also find plenty of sheets and bedding sets in this size. But twin bed dimensions make them a poor choice for teens who are expected to be close to 6 feet tall, as their feet will surely hang off the end of the bed.  

Hey parents, have you checked out our latest post on bedtime routines? We’re spilling all our secrets here: “A Parent’s Guide to a Bedtime Routine for Kids.”


Twin XL Beds 39” x 80”

If you have a taller teen with a fairly small bedroom, a twin XL is the way to go. They are the same width as a twin mattress but 5 inches longer, making them popular for college dorm rooms who like to accommodate tall students.

One drawback to a twin XL mattress is that sheets are not as easy to find in popular department stores, so if you plan to buy one, be prepared to shop online for a better selection.

Full-Size Beds 54” x 75”

Also known as double beds, full-size mattresses allow a little more room for a child or average size adult to sleep. Double bed dimensions are 54”x75”, which is the same length but 15” wider than a twin. If you want to get your child a mattress that he can have more room to toss and turn on, and you aren’t worried about him growing to almost 6 feet tall, a full mattress may work. It will take up less space than a queen, and you’ll also be able to find plenty of bedding in stores.

In some apartments and smaller homes, a full-size bed is what couples choose to sleep on. But keep in mind that you and your partner will each have only 27” on each side of the bed, so if you have a good sized bedroom, you’ll want a bigger mattress.

Queen Size Beds 60” x 80”

Queen size bed dimensions make them popular for couples. At 60”x80”, queen mattresses are 6” wider than a double bed allowing more room for sleeping but still don’t take up as much floor space as a king. And with 5” longer than a double bed, a queen bed can accommodate taller adults and teens, so keep this in mind if you expect your older kids to grow close to 6 feet.  

Need a mattress for the guest room? Making a decision between a queen vs. full bed may be tough. Just remember that if you have taller guests or couples who will be staying with you, a queen will give them more room than a full.

King Size Beds 76” x 80”

If you pushed two twin XL mattresses together, you’d have the same size bed as a standard king. Couples who have been sleeping on a queen mattress together are always amazed at how much more room a king mattress gives them (especially if their kids crawl in bed with them in the middle of the night). King size bed dimensions are 76”x 80” making them the same length as a queen, but allowing eight more inches of wiggle room on each side of the bed.

King size beds are luxurious, but there are a few drawbacks to having a larger mattress. First, they won’t fit in a smaller bedroom. Second, king comforters and other bedding is more expensive. And third, you’ll need either three standard or two king size pillows to fit across the bed.

California King Beds 72” x 84”

Are you or your spouse really tall? The mattress dimensions of a California king may suit you best. At 72”x84”, this bed isn’t as wide as a standard king, but the extra 4” in length make sleeping comfortably if your feet hang off of a queen or king.

However, even though a California king mattress comes with two twin XL box springs, its very large size makes it awkward to move, and it may not fit up some stairways. Bedding for a California king is also harder to find and more expensive than a standard king.

How Often Should You Replace Your Mattress?

According to the National Sleep Foundation, most mattresses should be replaced every eight years. You can tell if your mattresses have been worn out if you see sagging spots in the middle or at the edges, and if you can feel the bed shaking or wake up every time your partner moves. Also, if everyone in your family sleeps better on hotel beds when you’re on vacation, it may be time to evaluate why your mattresses at home aren’t as comfortable.

Once you have chosen the right size, you should determine what kind of mattress foundation is best for your mattress type. We’re explaining all of that here: “Bed Frame vs. Mattress Foundation vs. Platform Bed.”

Mark’s Mattress Has a Bed For Everyone in Your Household

When it comes to helping your family sleep well, there’s nothing more important to us. Bring everyone into our showroom and we will find a comfortable bed for each one of you, at affordable prices to fit your budget. Visit a location nearest you to speak directly with one of our professional mattress experts, or browse our online inventory of Sleep Natural™.

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