What Size Is A Trundle Bed Mattress?

The Dimensions of a Trundle Bed Mattress

A trundle bed mattress typically comes in two sizes: twin and full. The twin size is the most common and measures approximately 38 inches wide by 75 inches long. The full-size trundle mattress, though less common, measures around 53 inches wide by 75 inches long. It’s important to note that trundle bed mattresses are often thinner than standard mattresses, with a typical thickness ranging from 6 to 8 inches, to allow for easy stowing underneath the main bed.

Understanding Trundle Beds

What is a Trundle Bed?

A trundle bed is a low, wheeled bed that is stored under a larger bed and can be rolled out for use when needed. It’s a space-saving solution that’s perfect for small bedrooms or for accommodating guests. Trundle beds can either pop up to the same height as the main bed or remain at a lower level when extended.

Variety in Trundle Bed Designs

While the dimensions mentioned above are standard, it’s not uncommon to find trundle beds of varying lengths and widths to accommodate different room sizes or design preferences. Some manufacturers may offer custom sizes, although availability may be limited and could come at a higher cost.

The Reduced Thickness of Trundle Mattresses

As mentioned earlier, trundle mattresses are usually thinner than regular ones. This attribute is by design to allow the bed to fit comfortably in the limited space available underneath the main bed. Usually, they do not exceed 8 inches in height because a mattress that’s too thick might not fit under the main bed frame or could be difficult to roll out.

Choosing the Right Trundle Mattress

Finding the Perfect Fit

When shopping for a trundle bed mattress, it’s crucial to measure the trundle bed frame accurately. Bear in mind that a mattress should fit snugly within the frame to avoid movements or slips, yet not be so tight that you can’t make the bed with standard size sheets or remove the mattress for cleaning or airing out.

Comfort and Thickness

The ideal thickness for a trundle bed mattress depends on various factors—primarily the clearance space under the main bed and personal preference for comfort. Consider how often the trundle bed will be used and by whom. For occasional use by guests or children, a thinner mattress might suffice. However, for regular use or for accommodating adults, opting for the thickest mattress that will fit could be more comfortable.

Material Matters

The material of a trundle mattress can range from memory foam, innerspring, hybrid, to latex. Memory foam offers good support and conforms to the body, which can be advantageous in a thinner mattress. Innersprings are traditional and might offer a bouncier feel. Hybrid mattresses, which combine foam and innersprings, could offer a balance between comfort and support. Lastly, latex is known for its durability and eco-friendliness but tends to be on the pricier side.

Maximizing Space with Trundle Bed Mattresses

Space Efficiency

The true benefit of a trundle bed lies in its ability to maximize space. When not in use, trundle beds occupy no more space than the main bed. But when the need for additional sleeping space arises, a trundle bed proves to be an excellent solution, without requiring the footprint of an entirely separate bed.

Multipurpose Use

Trundle beds aren’t just for sleeping. With the right mattress and accessories, they can double as a day bed or a comfortable seating area. This versatility can be especially useful in multifunctional spaces such as home offices or craft rooms that occasionally serve as guest rooms.

A Closer Look at Trundle Bed Mattress Sizing

Custom Sized Trundle Mattresses

While twin and full are the most common sizes, if you have a trundle bed with non-standard dimensions, you may need a custom-sized mattress. Many specialty mattress stores or online retailers can provide mattresses made to specific dimensions.

International Sizing Variations

It’s worth noting that mattress sizes can vary by country. For instance, a UK single mattress may differ in size from an American twin mattress. Therefore, if you’ve acquired a trundle bed frame from another country, or if you’re shopping for a mattress while abroad, you should not assume that sizes are interchangeable.

Tips for Selecting a Trundle Mattress

Consider The User

Take into account who will predominantly use the trundle bed. Children and teens can typically be accommodated on a standard twin-size mattress with regular thickness. For adults, you might want to consider a full-size and seek a mattress with maximum thickness for added comfort.

Check The Weight Capacity

Often overlooked is the weight capacity of both the trundle frame and the mattress. Make sure to choose a product that can support the intended user’s weight to ensure safety and longevity of the bed and mattress.

Quality and Durability

While a trundle bed might be used less frequently than regular beds, ensuring that you buy a quality and durable mattress can be cost-effective in the long run. A durable mattress will maintain its comfort and support over time, even with intermittent use.

Read Reviews

Mattress shopping can be daunting. Reading reviews can provide insight into the durability, comfort, and any potential issues of a mattress before making a purchase. Look for reviews from customers who have used the mattress for a similar purpose as you intend.

Top 5 Mattresses Recommended By GoodSleepHub.com

Warranty and Trial Periods

Always check if the mattress comes with a warranty or sleep trial period. These can offer peace of mind and protection for your investment.

Finishing Thoughts

Choosing the right mattress for a trundle bed requires considering both the size and purpose of the bed. Whether you’re accommodating overnight guests, outfitting a child’s room, or simply maximizing space, thoughtfully considering the size, material, and comfort level of your trundle bed mattress will ensure you make a suitable choice. Remember, a trundle bed can offer more than just an extra sleeping space; with the right mattress, it can also enhance the versatility and functionality of a room. Keep these insights in mind and sleep comfortably knowing you have the perfect fit for your trundle bed.


  • Aiden Lawrence

    I'm Aiden Lawrence, a certified Sleep Science Coach and senior editor of GoodSleepHub, proud parent of two amazing kids, and a pet lover with a cat and a dog. Join me as we explore the world of sweet dreams and comfy pillows. Let's make bedtime the highlight of your day!

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