Before buying a new mattress, there are many factors to consider, such as material, firmness, and cost — but the first decision you’ll always have to make is size. Most mattresses are available in Twin, Full, Queen, King, and California King sizes with some stores offering crib and Twin XL sizes too.
The Good Housekeeping Institute Textiles Lab consists of bedding experts who evaluate mattresses, sheets, and pillows for your perfect bed. Our pros explain the differences between standard mattress sizes to make it easier than ever to find your dream bed. While these are the standard dimensions, sometimes there will be slight differences brand to brand. It’s always best to confirm the specific dimensions of the mattress before buying.
What mattress size is best for you?
What are the differences between mattress sizes?
27” x 52”
Best for babies and toddlers, crib mattresses are designed to fit perfectly in a standard crib, suitable until toddlerhood. They’re available as a foam or innerspring mattress like adult mattresses, but tend to be firmer for safety reasons.
39” x 75”
Once your child graduates from a crib, they’ll likely move to a “big kid bed,” where you’ll need a Twin mattress. Best for kids or other single sleepers, a Twin is also the best mattress size for bunk beds too.
39” x 80"
A bit longer than a twin, a Twin XL mattress is typically found in college dorms and is best for tall children, teenagers, or other solo sleepers. As it’s five inches longer than a standard Twin mattress, it gives more room for taller teenagers to spread out. Note that Twin XL mattresses are less widely available than other sizes, but many brands offer Twin XL mattress toppers to help make dorm mattresses more comfortable.
54” x 75”
A Full mattress is the first size that can accommodate couples. While it’ll offer a lot of space for single sleepers, couples will be a bit more cramped. It’s a popular choice for young adults or smaller guest bedrooms.
60” x 80”
Queen is the most popular mattress size on the market, as it’s perfect for couples. It offers ample space to spread out and allow kids and pets to sneak onto the bed sometimes.
76” x 80”
For a big family or lots of pets, a king size bed can accommodate a huge crew. With a king mattress, couples each get about the width of a twin mattress to spread out and sleep comfortably. A King is best for couples who grew out of a Queen mattress or families who want space to all snuggle in bed.
72” x 84”
Four inches thinner than a King mattress, California King mattresses add those four inches to the length, making this the longest mattress style available, perfect for taller couples with kids or pets. Note that this style is usually the most expensive.
How to find your perfect mattress size
Overall, a quality mattress can last for over a decade, so we recommend investing in a mattress you love. While it’ll ultimately come down to personal preference, the following are some considerations to make before deciding which mattress size is best for your needs:
Room size: Measuring out the space where your bed will go is a great way to make sure the mattress will fit nicely with the rest of your bedroom furniture. To have room for nightstands and to avoid having a cramped space, it’s best to leave about two feet of space on each side and the end of the bed.
Sleeping partners: If you share the bed with a partner, both of you will have to agree on the best size. Couples usually start with a Queen size mattress, but if you're sharing the bed with pets or kids, you might want to size up, especially if you both prefer having more space and legroom.
Height: If you’re very tall and still want ample legroom, a California King has the longest length. If you are under 6’5”, a Queen or King size should provide enough length to sleep comfortably.
Cost: Mattresses are a pricey purchase and only get more expensive the bigger they get. Remember that sheets also increase in price for bigger mattresses!
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