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Single vs. Twin Bed Size: How Do They Compare?

Last Updated on September 25, 2023

Written by Jill Zwarensteyn

Lots of people seem to be wondering about the difference between the single and the twin bed.

It’s obvious that sizing is one of the most important consideration when choosing a mattress, so let’s have a closer look and identify the difference between those two commonly mistaken types.

How Big is a Single Bed?

A single bed is 39 inches wide and 75 inches long. Its main designation is to fit one person. Obviously, this is where the name “single bed” stems from. These are comfortable and convenient for kid’s rooms and are likely going to be suited for the kid until he hits high-school age as the 75 inches might not be enough at that point. It’s one of the most preferred options when it comes to furnishing children’s rooms.

How Big is a Twin Bed?

The twin measurements are practically identical to the single. However, it is intended to be one of a pair of single beds. They are usually put in guest rooms which would be shared by more than just one person. They are also commonly chosen by couples who prefer to sleep together but not to share their bed as they don’t feel comfortable.

It’s also important to note that there are a few different variations of the twin size bed and the most popular one of them is the Twin XL.

Twin XL

There is just one difference between the regular Twin and the Twin XL. The latter comes with added 5 inches in length, making it suited for college kids and people who are slightly taller.

View Our Full Comparison: Twin vs. Twin XL Mattresses

Who Should Own a Single Bed?

A single bed is usually placed in a kid’s room. They are also quite perfect for hotels in rooms which are designed to sleep three people. These are the so-called “triple” rooms and are very characteristic for low-budget hotels and motels as they are far more affordable and yet they don’t compromise your sleeping comfort.

Additionally, single mattresses are preferred if you have a smaller guest room and can’t afford to place a larger sized unit.

Who Should Own a Twin Bed?

Twin beds are designed to go in matching pairs, as we already explained above. The most common application for them is the regular double room in a hotel. A lot of hotels use this instead of a common king-sized or regular two single in order to accommodate the versatile demand of clients who are single and those who are a couple.

Additionally, a twin mattress, as we mentioned above, are preferred for rooms which have to be shared by siblings, for example.

Need more info? Check out our twin size mattresses guide here.


There is obviously no difference in the single and twin measurements, but the intention and purpose of both beds are completely different. This is something that you’d have to account for when you’re making the call. Take the aforementioned into account in order to ensure that everything is handled perfectly.

Jill Zwarensteyn

Jill Zwarensteyn


About Author

Jill Zwarensteyn is the Editor for Sleep Advisor and a Certified Sleep Science Coach. She is enthusiastic about providing helpful and engaging information on all things sleep and wellness.

Combination Sleeper