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Different Mattress Sizes - Which One Do You Need?

Jimmy Graham

By Jimmy Graham
Updated August 5, 2026

Few things feel better than waking up after a good night’s sleep. Your mattress plays a vital role in getting quality rest. But sleeping on the wrong size mattress can inhibit a restful night. Learn how to choose the best size mattress for you and your family.

Key Takeaways

  • Standard mattress sizes let you choose an option that fits your space and gives you the best sleep possible.
  • A twin mattress is best for a child who has outgrown the crib, offering sleep space and room to grow with a 38-by-75-inch area.
  • A twin XL mattress is another good size for a teenager and a common size for dorm rooms, offering more length at 38 by 80 inches.
  • A full mattress works well for a typical single adult, offering a sleep space 54 inches wide and 75 inches long.
  • A queen mattress is the best option for a typical couple, as well as an individual who wants more space or has pets that sleep with them, offering  a 60-by-80 inch sleep space.
  • A king mattress has plenty of room for a typical couple, and, at 76 by 80 inches, sufficient space for parents and a child or pet parents and a large pet.
  • A California king mattress is a good size for taller couples or couples with pets that sleep at their feet, offering slightly less overall space than a king at 72 by 84 inches.
  • Whichever size you choose, make sure your bedroom has enough space for clearance to move around the bed easily.

What Are the Dimensions of Mattresses?

A graphic showing the different sizes of common mattresses.

Along with price, the size of a mattress is a determining factor for purchasing. We commonly talk about twin, queen and king-size beds, but most of the time don’t really know exactly how big or small they really are. We’ll tell you standard sizes for the most common mattresses.

Mattresses

Bed Frames

Box Springs

How Many People Will My Mattress Fit?

When thinking about a new mattress, knowing how many people will be sleeping on it is going to be the most important criteria. You certainly don’t want to buy a bed that's too small to sleep comfortably, nor do you want to buy one that is too large for your bedroom. In the following sections we’ll discuss the most popular mattress sizes.

Twin and Twin XL Mattresses

Twin beds are what most of us graduated to from our cribs. The bigger mattress size allows room for children to develop without outgrowing it in a brief time. Measuring approximately 38 inches wide by 75 inches long, twin mattresses are typically found in kid’s rooms, on bunk beds, as day beds and in small guest rooms. Twin XL mattresses are longer at 38 inches wide by 80 inches long and are usually found in dorm rooms. Twin size beds are designed to hold one person.

Good to Know

You might see up to an inch difference in standard mattress dimensions, depending on the manufacturer’s production process and measurement standards. Always check the dimensions of the mattress you’re considering.

Full Mattresses

A full-size mattress typically fits one adult comfortably or two people if it's a short-term share. A full mattress measures 54 inches wide by 75 inches long and is available in all of the major formats, including hybrid, memory foam and innerspring.

Queen Mattresses

The most popular bed size today is the queen bed. A queen mattress measures 60 inches wide by 80 inches long and is available in all of the major formats: foam, hybrid, innerspring and air. Queen size beds are best for singles who like extra room, couples or a person that has pets that want to sleep in the bed with them.

King Mattresses

King mattresses and beds offer the largest standard size. They're available in foam, hybrid, innerspring and air models. With a 76-inch-wide-by-80-inch-long size, a king mattress is large enough for couples who like a little extra room, children to snuggle with their parents, and for larger pets to sleep with their people. A king bed works best in a large bedroom that offers plenty of room to move around the bed.

California King Mattresses

While many people are familiar with king size mattresses, there's a lesser known but similar-sized California king bed mattress. California kings are 4 inches less in width at 72 inches but 4 inches longer at 84 inches. California king mattresses are best for taller people, or couples who have larger pets that sleep at the foot of the bed. Like regular king beds, California kings do best in a large bedroom or space.

Good to Know

Aside from size, you'll need to think about comfort level. Select from medium, firm, plush, extra-firm or extra-plush mattresses.

Twin and Twin XL Mattresses

Full Mattresses

Queen Mattresses

King Mattresses

California King Mattresses

Bedding and Mattress Accessories

Now that you’ve decided on a mattress, it’s time to get sheets and comforters to dress your bed. Bedding sets are an easy option as they can contain everything you need in an all-in-one pack, including sheets, a comforter and pillow shams. You can protect your mattress from perspiration, dead skin cells and accidental spills with a mattress cover. Some covers also guard against dust and allergens or offer bed bug protection. If you like a little extra padding on your mattress, consider a mattress topper. Placed on the top of the mattress, it adds pillow-like softness and can guard against wear and tear.

Bedding

Comforters & Bedspreads

Mattress Covers & Toppers

Let's Get Started

If you're ready to purchase your mattress, shop for mattresses online by size, price range, type and more, and have your new mattress delivered to your home. Don't forget to purchase sheets, pillows, a mattress cover and a comforter.

Mattress FAQs

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