Beds and bedding products come in specific sizes. Different accessories like the fitted sheet, flat sheet, duvet cover and comforter all have a different size.

If you already own a bed and are looking to buy something new for it, it is important to understand what size you own and what dimensions you should be looking to find for various accessories.

If you are in the market for a new bed, it is extremely important to learn a bit about bedding sizes ahead of time to ensure that you get the right one. After all, many people keep a mattress for 10 years or even more, so you simply don’t want to be stuck with a bad night of sleep for the next decade.

There are five main mattress sizes: twin, full/double, queen, king, and california king. There are crib mattresses, but those are standard sizes for all modern cribs and often toddler beds as well.

Common Bed & Mattress Sizes

This mattress size guide for American (USA) consumers reviews the five main sizes to help you pick the right one for your needs. A lot of people make this decision hastily, but there are really some important things to consider when you are picking the right bed.

  • Age – Adults and children have different bedding needs.
  • Sex – Smaller adult females can sometimes get away with using a smaller mattress size, but most adult men should stick to specific types and completely avoid those made for children.
  • Usage – If you sleep alone or with a partner, you may need a completely different bed. This is something that many newlyweds do not consider until after they are married and crammed onto a mattress that is too small.

Take a look through each of the types below for our recommendations so you can select the right one for you to ensure yourself a restful sleep for many years to come.

The smallest size, except for crib mattresses, is the twin mattress. These are ideal for young children but not recommended for adults because they are often not long enough. There is also a twin XL size that offers additional length, so these may be acceptable for single adults.

Full (Double)
The next size up is excellent for children, especially since it leaves room for a parent to lay down next to them or a friend to have a sleepover. Some adults and even married couples actually use full size mattresses, but this is not recommended because they are the same length as a twin.

The smallest size that most adults should be using is a queen mattress. It may even be enough room for married couples, as long as each person does not require a lot of width in the bed. For two people, this leaves each person with 8 inches LESS width than they had in their childhood twin size bed, so it is really only recommended for single adults.

For two adults to have the same width as two twin beds, they would need to go for a king. Many king sets actually use two twin boxes under the large king size mattress. Although this would certainly offer enough room for any single person, it is typically recommended for two adults.

California King

In the state of California, they make a different king size bed that is actually 4 inches longer than a standard king. This makes it an excellent choice for tall people since it is a total of seven feet long. The only drawback is that the width offers 4 inches less overall, although this is definitely a lot more than a queen can offer.

Below you can find the dimensions for each mattress size, along with corresponding sizes for each type of bed accessory.

Bed Name Mattress Dimensions Fitted Sheet Flat Sheet Duvet Cover Comforter
Twin 38″ x 75″ 39″ x 76″ 72″ x 102″ 59″ x 79″ 80″ x 106″
Full 54″ x 75″ 54″ x 76″ 87″ x 102″ 79″ x 79″ 100″ x 106″
Queen 60″ x 80″ 60″ x 80″ 105″ x 110″ 88″ x 86″ 106″ x 106″
King 76″ x 80″ 76″ x 80″ 110″ x 114″ 102″ x 86″ 112″ x 106″
California King 72″ x 84″ 73″ x 85″ 110″ x 114″ 102″ x 86″ 114″ x 106″