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What Size Is A Bunk Bed Mattress?

Bunk Bed with Mattress

Bunk beds have proven to be a popular investment for a lot of parents. Not only are bunk beds great for maximizing space, but they can also make sleeping more fun for children. So, for both parents and children alike, bunk beds are a great option. Still, purchasing a bunk bed is just the first step to outfitting a bedroom. Now, you need the appropriate mattresses for the new bunks. So, the inevitable question arises, what size mattresses do I need for a bunk bed? Believe it or not, there are so many factors to consider - mattress size, quality, durability, and of course, price point. However, in this guide, we break down the various bunk bed mattress sizes to make the mattress buying process a little easier for you.

Different Types/Sizes of Bunk Beds

It is important that you purchase the correct mattress size for your bunk bed. Because they are usually intended for use by children, bunk beds generally come with added concern for safety. Buying the incorrect mattress size can lead to:

  • A mattress that extends above the guardrails
  • A gap between the guardrails and the bedding

These are two issues that you want to avoid. To ensure you get the right mattress size, you need to pay attention to the type of bunk bed you get. The size of a bunk bed mattress is determined by the size of the bunk’s bed frames. Bunk beds come in a variety of types and sizes, but most often remain on the smaller end of the mattress size spectrum. Most bunk beds use twin size mattresses, but some are built to accommodate slightly larger sizes. Here is a summarized list of the most common bunk bed mattress sizes:

  • Twin over Twin: This is the standard bunk bed construction that fits two traditional twin size mattresses, each mattress measuring 38 inches wide and 75 inches long.
  • Twin XL over Twin XL: These mattresses measure a little longer than a standard twin size. They are 38 inches wide and 80 inches long (same length as a king or a queen size). Twin XL bunk beds are great for taller sleepers, as they provide extra legroom.
  • Full over Full: These bunk beds measure 53 inches wide and 75 inches long. Full size mattresses are the same length as twin size, but offer almost 15 inches of additional space to stretch out. Full size bunk beds are not as popular, but they are becoming more common with teens and college-aged adults.
  • Twin over Full: In this case, the top bunk would be a twin size mattress while the bottom bunk is a full size. This configuration is relatively common when children of various ages are sharing a room.

Although king or queen size bunk beds are rare, they still are available:

  • Queen size mattress: 60 inches wide and 80 inches long
  • King size mattress: 76 inches wide and 80 inches long

What to Consider When Choosing Your Bunk Mattress

It goes without saying that your main priority when selecting your bunk mattresses is most likely bunk bed safety and long term sleep quality. With this in mind, the factors you should consider when choosing your mattress include:

  • Thickness: The ideal thickness of the upper bunk mattress is 6 to 8 inches. Having a low profile mattress height is important because you want to stay within the bounds of the guardrails and make sure you still have enough headroom.
  • Weight: A lightweight mattress is preferred for the upper bunk because a heavier mattress can actually pose a safety risk. Just be sure to check the maximum weight capacity of the bunk bed.
  • Cooling Technology: Because heat rises, it can get warm in the top bunk. So, you may want to invest in a mattress with cooling technology that can help regulate body temperature throughout the night.

How Can a Bunk Bed Benefit You?

There are many advantages in purchasing a bunk bed, especially when you outfit your new setup with high-quality mattresses. BedInABox® mattresses are constructed with safe, CertiPUR-US® certified memory foams and are available in all three of the popular bunk bed sizes. While we suggest looking into our lower profile mattresses first, such as our lighter weight Essential or Original mattress models, we do have mattresses suitable for all bunk bed configurations. Some other advantages of bunk beds include:

  • Additional space: With the two beds stacked over one another, you now have free, valuable floor space. You can add more furniture and your kids can have more room to play.
  • Saving money: You don’t have to worry about the added expenses of multiple headboards and foundations/box springs.
  • Bed versatility: Bunk beds can often be separated into two beds if needed. They come in many different configurations that can include trundles, built-in drawers, or even cubbies.