How Twin Mattresses Differ in Size

Twin mattresses, which are sometimes also called single mattresses, are among the most popular mattresses sold today. Twin mattress dimensions come in three sizes: youth size, standard length and XL. Here are summaries of each, along with information as to where they’re commonly used and by whom.

Twin Mattress Dimensions

Youth Size Mattresses.

Youth mattress are typically 66” long x 33” wide x 5” deep. These are the smallest mattresses available, with the exception of baby crib mattresses. Kids quickly outgrow them and they ultimately need replacing. As a result, most parents prefer to purchase standard twins for still-growing young children. Youth mattresses can be difficult to find and may need to be special ordered.

Standard Twin Mattresses.

Standard twins, also known as single mattresses, are one of the most popular twin mattress dimensions on the market. At 38” wide x 75” long, they’re also the smallest of all conventional mattress sizes. Standard twins have plenty of room for a growing child or average-sized adult to stretch out and sleep in comfort. However, taller teens and adults may find them to be a bit too short for a comfortable night’s sleep. Their compact size and footprints take up less than 20 square feet of floor space. As a result, they’re great for smaller bedrooms.

Standard twin mattresses are also versatile. They’re suitable for day beds, trundle beds, hideaways and bunk beds because they don’t need box springs. You can also double the sleeping capacity of a small bedroom with two standard twin mattresses for bunk beds. Furthermore, small and lightweight standard twins can be easily turned or rotated every few months. In fact, manufacturers recommend this to extend their use.

Twin XL Mattresses.

Most mattress manufacturers also offer extra long twin XL mattresses. Twin XLs are the same width as standard twin mattresses, but are five inches longer. They have plenty of room for a child to grow without having to replace his or her mattresses. Twin XLs are another good choice for bedrooms too small to accommodate full size or larger mattresses.

Twin XL mattresses also have enough space for a taller than average adult to sleep comfortably. In fact, twin XLs are often found at boarding school and college dorms because of their versatility and compact size.

Twin XL mattresses are the same length as queen and king mattresses. When two twin XLs are placed side by side, they provide the same sleeping surface as a king size mattress. Two twin XL mattresses can also be used on a split adjustable bed frame. Both sleepers can have a mattress in their preferred comfort level. They can also add a foundation that can raise or lower each mattress’ head position.

How Do Twin Mattresses Differ in Comfort Level?

Now that the question, “how big is a twin mattress?” is answered, it’s time to consider comfort level. Having the right sleeping surface counts for just as much as having the right size mattress. Twin mattresses come in a wide variety of comfort levels suitable for all kinds of sleepers. Consider each of these options:

Very Firm

These mattresses have minimal padding on top to provide a rigid sleeping surface that keeps the spine aligned. Back sleepers often prefer very firm mattresses, but they are less comfortable for stomach and side sleepers.

Medium Firm

These mattresses offer more padding but still have a firm sleeping surface that supports the back. Stomach and back sleepers both gravitate toward medium firm mattresses, but side sleepers typically prefer something softer.


These mattresses are popular because they balance firm and soft in a way that appeals to all kinds of sleepers. If you need to furnish a guest room, choose a medium mattress that delivers comfort in any sleeping position.


These mattresses have extra padding that allows the sleeper to sink into the surface. As it result, it provides extra relief for pressure points in the hips, spine, shoulders, and neck. Soft mattresses are great for stomach and side sleepers. However, they could leave back sleepers with morning aches because they provide less spine support.

Very Soft

These mattresses come with thick padding that surrounds the sleeper and cradles each part of the body. Most stomach and back sleepers need more support, but side sleepers love how it conforms to their individual sleeping position.

The descriptions above are generalizations. Every mattress brand and model is different. The only way to know which one is right for you is to try them out in person. Make sure you test out twin mattresses in different comfort levels. Furthermore, be sure to experiment with different sleeping positions. If you’re still wondering “how big is a twin mattress?”, stretching out on one helps put the size into perspective.

Find Twin Mattress Dimensions at Sit ‘n Sleep

Whether you’re interested in a standard twin or twin XL mattress, you’ll find what you need at any Sit ‘n Sleep mattress superstore. We carry all major mattress brands, including SealyBeautyrestStearns & FosterTempur-Pedic, and Hybrid Infinity in a full range of comfort levels and construction types. What’s more, our prices can’t be beat. Stop by one of Sit ‘n Sleep’s 38 Southern California outlets. Our sleep consultants will help you select a twin mattress that meets your sleeping needs and fits your budget.

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