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What are the Standard Mattress Dimensions?

What are the Standard Mattress Dimensions?


Unmade Sealy Mattress in Bedroom

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.

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.

Benefits of a Twin Mattress

  • Fits in smaller spaces - A twin size mattress fits in small bedrooms where space might be limited.
  • Perfect for kids - It provides plenty of room for a child to lie comfortably in bed.
  • Good option for guests - 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.

Benefits of a Twin XL Mattress

  • Ideal for dorm living - This model is a standard option for college dorm rooms because it's long enough to support an adult sleeper without hogging up space with its width.
  • Good for guest rooms - 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 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.

Benefits of a Full Mattress

  • Solid choice for pre-teens & teens - A full size mattress is a great next step for kids who have outgrown their twin mattress.
  • Saves space - If you can't fit a king or queen mattress in your bedroom, a full size mattress is an ideal compromise.
  • Accomodates two sleepers - 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. 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

  • Perfect in smaller master bedrooms - A queen mattress fits better in a smaller master bedroom or medium-sized guest room than a king size option.
  • Solid space for two sleepers - This model offers more than enough room for a single sleeper or two sleepers to spread out comfortably.
  • More sleeping surface than a full - 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. 

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.

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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