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What are the Standard Mattress Dimensions?

What are the Standard Mattress Dimensions?


Finding a mattress that suits your bedroom and sleeping style can help you wake up refreshed and ready for the day ahead. Whether you need a compact twin mattress for your first apartment or a spacious king bed for your new home, choosing the right size for your build, sleeping posture and space is easier when you know the dimensions of each model. Learn more about the unique specifications and benefits of twin, full, queen, king and extra-long mattresses.

Unmade Sealy Mattress in Bedroom

Twin Mattress Dimensions

A twin mattress, also commonly known as a single mattress, accommodates one adult or child sleeper. A twin model is 39 inches by 75 inches and typically works best in a smaller bedroom, on a daybed or with a bunk bed set. While it's possible accomodate two sleepers on a twin size mattress, it might be too snug.

Benefits of a Twin Size Mattress

  • A twin size mattress fits in small bedrooms where space might be limited
  • It provides plenty of room for a child to lie comfortably in bed
  • This model works great as a bed in your guest room to accommodate one sleeper

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Twin Size Bed Diagram

Twin XL Mattress Diagram

Twin XL Mattress Dimensions

A twin extra-long (XL) mattress provides ideal comfort for tall children and adults as well as growing teenagers. A twin XL model measures 39 inches by 80 inches, which is about 5 inches longer than a standard twin mattress. This size bed is perfect for one tall sleeper, and pairing two together is a great way to outfit a guest room. Two twin XL mattresses can be used for single sleepers or to accomodate couples by pushing together both beds to make a king size bed.

Benefits of a Twin XL Mattress

  • This option fits in a smaller bedroom, especially in a college dorm room
  • A twin size XL mattress works well in a guest room for single sleepers, and two models can support a couple when pushed together

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Full Mattress Dimensions

A full mattress, also known as a standard mattress, is 54 inches by 75 inches and can accommodate two sleepers if necessary. While this option was originally manufactured for two people, it has become a more spacious option for a single sleeper and is a perfect option for an older child or teenager. A full size bed is typically 15 inches wider than a twin bed, offering more room for a single sleeper to move around. This type of mattress is a safe choice for a guest room because it can accommodate two people or provide a larger sleeping surface for one person.

Benefits of a Full Mattress

  • A full size mattress is a great next step for kids who have outgrown their twin mattress
  • If you can't fit a king or queen mattress in your bedroom, a full size mattress is an ideal compromise
  • The sleeping surface can fit one or two people comfortably

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Full Mattress Diagram

Queen Mattress Diagram

Queen Mattress Dimensions

A queen mattress is 60 inches by 80 inches and provides plenty of space for two sleepers to spread out comfortably. This model is a good option for two adult sleepers that want extra room while lying down. It fits best in medium-sized rooms or smaller master bedrooms. A queen size mattress is an especially popular mattress size because it gracefully saves space, while providing a large sleeping surface.

Benefits of a Queen Mattress

  • A queen mattress fits better in a smaller master bedroom or medium-sized guest room than a king size option
  • This model offers more than enough room for a single sleeper or two sleepers to spread out comfortably
  • The sleeping surface provides more width and length than a full size model

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King Mattress Dimensions

A king mattress is 76 inches by 80 inches and offers couples or single sleepers maximum space to spread out. This model is the same length as a queen size mattress but 16 inches wider to better complement two sleepers. The sleeping surface works best for tall people or sleepers who like to have plenty of room. A king mattress is also ideal if you have children or pets that like to share the bed from time to time.

Benefits of a King Mattress

  • This type of mattress gives a sleeper more width to spread out comfortably
  • A king bed offers the most space for couples

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King Mattress Diagram

California King Mattress Diagram

California King Mattress Dimensions

A California king mattress is a specialized king size mattress that caters to taller people by giving them a longer sleeping surface. This type of mattress is 72 inches by 84 inches, sacrificing 4 inches in width but adding 4 inches in length compared to a standard king model. A Cal king mattress can accommodate someone as tall as 7 feet, and it fits best in a larger bedroom or master bedroom.

Benefits of a California King Mattress

  • A Cal king mattress is ideal for taller sleepers whose feet may dangle off the edge of other mattress sizes
  • The sleeping surface can also offer more space at the foot of the bed for pets

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