Choosing a mattress size is an important aspect of your next bed purchase. There are six standard mattress sizes, as well as a handful of less common sizes. If you’re a single adult, or if you’re purchasing a bed for a child, the best options will likely be twin, twin XL, or full.

The two more spacious options include twin XL and full, both of which offer unique advantages and disadvantages. If you’re trying to decide between twin XL vs full, this guide will cover everything you need to know.

Twin XLFull (AKA Double)
Dimensions38” wide, 80” long54” wide, 75” long
Surface Area3,040 square inches4,050 square inches
Best ForSingle sleepers over 6′ tall; growing children and teensSingle sleepers under 6′ tall; couples on a tight budget
  • Ample legroom (same length as a queen)Versatile and “future-proof” for rapidly growing children
  • Feels very spacious for a single sleeperCan be used by couples
  • Insufficient space for couples, parents with small childrenLess common size, so accessories are harder to find & more expensive
  • Cramped for sleepers over 6′ tallCan feel cramped for couples

Find Your Mattress

Answer 5 Easy Questions To Discover Your Perfect Mattress

What position do you sleep in?

  • Side icon


    You normally wake up sleeping on your side

  • Back icon


    You normally wake up sleeping on your back

  • Stomach icon


    You sleep lying flat on your stomach

Do you experience any pain while sleeping?

  • Back and / or Side Pain icon

    Back and / or Side Pain

    I often have back and/or side pain after waking up and into the day

  • Neck and / or Shoulder Pain icon

    Neck and / or Shoulder Pain

    I often have neck and/or shoulder pain after waking up and into the day

  • Little to No Pain icon

    Little to No Pain

    I rarely experience any pain from sleep

Do you have any material preferences?

  • Innerspring icon


    I prefer a more traditional coil-based mattress

  • Foam icon


    I prefer a coil-less design made of memory foam, latex, and fabric.

  • No preference/ Other icon

    No preference/ Other

    I don't mind any material as long as I feel good sleeping

Do you sleep hot?

  • Yes icon


    You tend to heat up at night and wake up sweaty often

  • No icon


    You never have issues being too hot during the night

Do you sleep with a partner?

  • Yes icon


    We'll recommend beds that have superior motion isolation to account for partner movement during the night

  • No icon


    Motion isolation is less of a factor in our mattress recommendations

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The twin XL mattress dimensions (38 inches wide, 80 inches long) are best suited for single sleepers who are over 6 feet tall, or growing children and teens who may exceed 6 feet eventually. A twin XL is insufficient for couples and parents with small children sharing the bed.

The full mattress dimensions (54 inches wide, 75 inches long) are more versatile. A full, or double, mattress is a good choice for a single adult under 6 feet tall who wants a more spacious feel. Fulls can also be used for couples, although some may find them a bit cramped. For perspective, a full mattress is 6 inches less wide and 5 inches shorter than a queen, the most popular size choice for couples.

The table above provides a quick summary, but there are many factors you should consider before making your selection.

Which Size is Best for You?

Before choosing between twin XL vs full, here are some important factors to keep in mind:

Cost & Availability – Do you have a budget in mind for your mattress purchase? In general, you can expect to spend significantly more for a full than a twin XL. For cheap mattress models, expect to pay $200-$300+ more for a full, while luxury fulls may carry a price premium of $500 or more over the cost of a comparable twin XL. On the other hand, twin XL beds and accessories are less popular, and therefore have less availability and selection overall.

Sleeping Partners – Do you share your bed with a partner, child, or pet? If so, a twin XL will likely be too small. Even a full will feel cramped for some couples, but provides a good solution for single parents with small children or pets. If you’re a single sleeper with a small pet sharing the foot of the bed, a twin XL may actually be a better option, because of its additional leg room.

Height & Sleep Position – How tall are you? If you or your partner are taller than 6 feet, you will likely find that a full feels cramped in terms of leg room. For single sleepers, a twin XL may be a better option. For taller couples, upgrading to a queen mattress may be necessary.

Bedroom Dimensions – What are the dimensions of the room you plan to use the new bed in? Both sizes should fit well in most spaces, but the twin XL size is more conducive to narrow rooms. We recommend measuring the space you plan to place the bed in, and ideally allowing for around 24 inches of extra space between the bed and each surrounding wall or piece of furniture.

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