Mattress 101

How to Choose a Bed Size For Your Room

As the old saying in carpentry goes, “measure twice and cut once.” The saying also holds true when shopping for a new bed frame and mattress combination. It’s important to measure your room and consider where you will be placing your bed. Not knowing how to choose bed size can have unfortunate consequences.

How To Choose Bed Size

Choosing a bed size can be frustrating. Imagine the disappointment of purchasing a new bed only to find out that it doesn’t fit in your bedroom. The same is true for a bed that’s dwarfed by your room’s size, making it feel cold, empty and uninviting. Here are a few simple guidelines on how to choose bed size.


Standard twin beds, which are 38” wide by 75” long have enough room for an average size adult to sleep comfortably. Twin beds are also often used in children’s rooms. The bedroom should be around 70 square feet to accommodate a single twin bed or set of bunk beds. This will ensure space for scattered toys, a dresser and possibly a storage chest. If two twin beds are placed in the same room, the room should be at least 10’ x 10’.


A typical Twin XL Beds is 38” wide x 80” long. Kids who are still growing and some taller than average adults usually sleep in them. Although they’re the same width as standard twin mattresses, twin XL bed and mattress combinations are a full 5” longer. The room should be around 7’ x 10’ to comfortably fit a twin XL bed frame. This will still leave space for a dresser or storage chest.


Sometimes also called double beds, full size mattresses measure 54” x 75”. This is a generous 16” wider than a standard or standard XL mattress. Full size beds have plenty of room for two smaller-bodied people to sleep comfortably. In addition, they’re a great choice for children who are beginning to outgrow their standard size twin beds. To accommodate a full-size bed, a room needs to be 10’ x 12’, or a total of 120 square feet.


Although they’re the same 80” in width as a standard full-size mattress, full XL beds are 54” long. This makes them 5” longer than a standard full bed. The additional length makes Full XL beds a good alternative for taller sleepers who need extra foot room. Although a full XL bed will fit in a 10’ x 12’ room, it may be a bit cramped. For a Full XL bed to fit comfortably, a bedroom that’s at least 10’ x 16’ is recommended. This will leave plenty of space for moving around, even after adding furniture.


More queen beds are sold today than any other size. They measure 60” wide x 80” long, which leaves plenty of room for two people to sleep comfortably. Queen beds are also a great choice for furnishing a spare room or guest room. Although a queen bed will fit in a 10’ x 10’ room, it might feel a bit cramped. A 10’ x 12’ bedroom will provide room for a dresser, nightstand or comfortable chair for reading and relaxing.


King size beds measure to be 76” x 80”. They’re about the same size as two Twin XL beds placed side by side. Kings are perfect for couples who enjoy a lot of personal sleeping space. Furthermore, they provide enough room for sprawling and stretching without disturbing your sleeping partner. Kings will fit in a 10’ x 12’ bedroom. However, a 13’ x 13’ or larger room will ensure an open, spacious feel after adding some furniture and accessories.


California Kings measure 72” x 84”. Although they’re 4” narrower than a standard king mattress, Cal Kings are also a full 4” longer. Couples with small children or pets will especially appreciate the generous proportions. A California King is best suited for a 12’ x 14’ bedroom so there is space for walking around and furniture.

Mattress Brands

When it comes to choosing a bed size, Sit ‘n Sleep should be your first choice. We have an excellent selection of king size mattresses for sale. We stock and sell the best mattresses made by some of the bedding industry’s leading manufacturers. You can find Kingsdown, BeautyRest, Serta, Sealy, Tempur-Pedic and more on our site or in our stores. What’s more, our everyday king size mattress prices simply can’t be beat. It’s a good idea to check back online frequently for one of our king size mattress sales. You can also view our great selection of king size beds and bed frames for sale online. In addition, we offer top quality bedroom furniture and accessories, including mattress protectors, sheets, pillowcases & pillow protectors and shams.

How To Choose Bed Size With Sit ‘n Sleep

From standard twin beds to California King frames and mattresses, you’re sure to find the ideal combination online. Call us toll-free at (800) 908-0354 or better yet, stop by one of our Southern California locations. Our knowledgeable sleep consultants will show you how to choose bed size that’s just right for you.