Twin XL Bed Size & Dimensions Guide
Upgrade your sleep setup with a Casper twin XL bed size, designed to offer extra length without taking up more width // perfect for taller sleepers, teens, and dorm-style spaces. The twin XL mattress size provides added comfort compared to a standard twin, making it a smart choice when comparing twin vs twin XL size options. Whether you’re looking closely at twin XL dimensions or exploring if a twin XL size is right for your space, Casper makes it easy to find the right fit for better rest.

Twin XL Mattress Size
The twin’s slightly longer cousin, the twin XL mattress, is the most popular size for college dorm rooms. It measures five inches longer than a twin, at 38 inches wide and 80 inches long. In addition to students, XL twin beds are a good solution for taller teenagers and individual adults with limited space. These beds can also be put together if you’re choosing a split king adjustable base for full body adjustability!
Best for
taller teenagers, single adults, or anyone with limited space.
Room size
The minimum room size for a twin XL mattress to fit naturally is 8 x 10 feet. Twin XL beds can also work well in narrow rooms that are at least 7 feet wide.
Get your Best Sleep and most Comfortable Sleep with a Casper mattress
Rest easy with our innovative mattresses, pillows, bedding, and furniture designed for every sleeper.

