How to pick the right size mattress for your room

When buying a new mattress, you want to find the model that maximizes comfort and support to give you the best sleep possible. But along with finding the right feel, you also need to account for practical matters like the size of your room and your budget. Your mattress is an investment, after all, and while you certainly don’t want to choose a mattress that’s too small, bigger isn’t always better. Here are some things to think about as you shop for the perfect mattress size for your room.

Who’s using the mattress?

The first and most obvious question you need to ask yourself is: Who am I buying this mattress for? Are you a single person looking for a mattress only for yourself, or for you and a partner? Are you buying for a child, and if so, how old are they? These questions will help you narrow down your choices right away because a couple usually can’t fit on a twin mattress very comfortably, and a small child doesn’t really need a king-size bed.

But to find the perfect mattress size, you also need to think about how you, your partner or your child sleeps. The average person moves roughly 40-60 times per night, including dozens of full body turns. So, if you’re a couple and one of you is a very light sleeper, it might make sense to get a bigger bed so you can accommodate these movements without waking the other person up. If you’re a young couple thinking about having children, you may want a slightly bigger mattress so you have space when your child inevitably wants to spend the night in your bed.

On the other hand, small children don’t need as large a mattress for actual sleeping, and they generally do need more space to play in their bedroom. So, buying a smaller mattress like a twin makes sense. However, a mattress is an investment, and ideally your child will be using the mattress for several years. If your child is on the cusp of their teen years or you’re expecting a growth spurt, you may want to opt for a larger mattress to account for their growing body and the fact that they will likely need less room to play in the near future.

Taking time to think about your sleep habits and how your needs may change over time will help you decide on the perfect mattress size now and into the future.

How big is your room?

Next, you have to account for the physical size of your room. Use a tape measure and compare your square footage to various mattress sizes to see what you’ll be able to fit. Here is a guide to standard mattress sizes:


Dimensions (Inches)

Dimensions (CM)


 27” X 52”

 68.5cm X 132cm


 39” X 75”

 96.5cm X 190.5cm

 Twin XL

 39” X 80”

 96.5cm X 203.5cm


 54” X 75”

 134.5cm X 190.5cm


 60” X 80”

 152.5cm X 203.5cm


 76” X 80”

 193cm X 203.5cm

 Cal King

 72” X 84”

 183cm X 213.5cm

As you compare different sizes, remember that you’ll need to leave space to move around the bed. Ask yourself, do I want to be able to enter from both sides, or am I OK having my bed in a corner? Will I have enough space for a nightstand on both sides?

Sometimes your bedroom’s floor plan will dictate where you can feasibly place a bed based on the arrangement of your closets, windows and doors. But you should also think about how you can rearrange your furniture to accommodate different size beds. Perhaps you can fit a king bed if you’re willing to give up a nightstand or move a dresser into a closet. As you think about what size mattress will work best, don’t be afraid to play around with different arrangements and furniture combinations.

What is your budget?

It’s true that generally speaking, the larger the mattress, the more expensive it will be. But that doesn’t mean you need to limit yourself just because of your budget. Mattress price depends more on the type of mattress and its features than it does on size. So with such a wide variety of mattress options out there, you can usually find any size mattress to fit any budget.

For help finding the right size mattress to fit your budget, your room and your needs, stop in to the Jonathan Stevens Mattress location nearest you. Our experts can answer any questions you have and help guide your buying journey so you can find the perfect mattress and get a better night’s sleep.