Bunk beds are the perfect solution for kid and adult problems alike — parents save space while children enjoy the fun of an elevated bed. Plus, who doesn’t love a never-ending sleepover?
The bunk bed, however, is only one part of the equation. The mattress is the other component.
So, what size is a bunk bed mattress? Put simply, it depends on the bed.
Bunk beds are generally designed for children, so the range of bunk mattress sizes is limited to the smaller end of the spectrum. Most bunk beds use twin mattresses, but they’re not the only kind available:
There are also loft beds that have open space underneath for a desk, futon, or storage area. The top is essentially the same as the top of a bunk bed, with a twin, twin XL, or full mattress.
If you’re not sure of your bunk bed’s size, measure the inside dimensions before you start mattress shopping. Buying the wrong size could actually be a safety concern if it hangs over the guard rail.
What kind of mattress for bunk beds is best?
Bunk bed safety and sleep quality are important considerations to account for when making your choice of mattress.
To that end, consider a mattress that is:
The ideal thickness for a bunk bed mattress, specifically for the upper bunk, is about six or seven inches. A low mattress height will maximize the efficacy of the safety rail and increase the available headroom, while still being thick enough to provide comfort and support. Naturally, if your bed has higher guard rails, you can enjoy a thicker mattress.
Sharing a bunk bed can be tricky, especially if the top sleeper is a tosser and turner on a creaky mattress. Again, for the top bunk especially, consider an all-foam mattress to reduce nighttime disturbances.
A thick, heavy mattress on the top bunk will pose a safety risk to both children. Always check the listed maximum weight capacity for your particular bunk bed — then find a thin, light mattress to match.
Hot air rises, meaning the top bunk will always be a few degrees hotter on those warm summer nights. If you can find bunk bed mattresses with cooling technology, you’ll be able to ensure a comfortable night’s sleep for both people, no matter the weather.
For many families, bunk beds are temporary. Your kids may grow out of a bunk bed mattress, however, it’s best to spend a little extra now for a durable, comfortable mattress so you can get the most out of it. You can always repurpose the mattresses into a larger bed after your children outgrow their bunk beds by pushing them together. If you’re wondering what size two twin beds make, it’s about the size of a king mattress.
Casper mattresses come in the three most popular bunk bed sizes: twin, twin XL, and full (as well as queen, king, and California king for any non-bunk beds). Between our four unique mattress types, you’ll be able to find something for both top and bottom bunks, including:
From the Element — our simplest, thinnest design — to the Wave and Wave Hybrid — our most advanced support system — Casper has deluxe mattresses to fit any type of bed.
We know kids can be picky, so try a Casper twin size mattress for 100 nights, risk-free. Soon enough, they’ll be telling you that it’s bedtime.