A twin mattress measures 38 inches wide by 75 inches long. That's the short answer. But whether a twin is the right choice depends on who's sleeping on it, how the room is set up, and whether the standard length is going to work for them.
This guide covers everything you need to know — dimensions, comparisons, use cases, and how to decide between a twin and twin XL.
A standard twin mattress is:
At 75 inches long, a twin works comfortably for most children, teens, and adults under 6 feet tall. If you're 6 feet or over, your feet may hang off the edge — in which case a Twin XL is worth considering.
| Size | Width | Length | Best For |
|---|---|---|---|
| Twin | 38" | 75" | Kids, teens, small spaces |
| Twin XL | 38" | 80" | Taller sleepers, dorm rooms |
The only difference is 5 inches of length. Both are the same width, so bedding for one often works for the other — but double-check fitted sheet sizing before buying.
Choose Twin XL if: The person sleeping is taller than 5'10", or if the bed is going into a college dorm (most dorms use Twin XL standard).
Stick with Twin if: It's for a child, a guest room, a bunk bed, or a space-constrained room where saving 5 inches matters.
Browse our twin mattresses or compare with Twin XL options.
The size is the same across all twins, so the decision comes down to feel and construction. A few things worth considering:
If you're not sure which feel is right, our team at any of our LA showrooms can help you test options in person. With 5 locations across Los Angeles, it's easy to try before you buy.
A standard twin mattress is 75 inches (6 feet, 3 inches) long and 38 inches wide.
Yes. "Twin" and "single" refer to the same mattress size (38" x 75"). The terms are used interchangeably.
A Twin XL is 5 inches longer (80" vs 75"). The width is identical at 38 inches. Twin XL is the standard in most college dorms and is better for taller sleepers.
Yes — for single adults under about 5'10", a twin can work fine, especially in a small space. Adults who are taller or who tend to move around a lot while sleeping will likely be more comfortable on a full or queen.
Most bunk beds are designed for twin-sized mattresses. Some use Twin XL, so check your frame's specs before buying. Also look for a mattress no thicker than 8–10 inches for safety clearance on bunk frames.
Standard twin sheets (38" x 75") fit a twin mattress. If your mattress is extra thick (14"+), look for deep-pocket fitted sheets. Twin sheets won't fit a Twin XL — make sure you're buying the right size.
Most twin mattresses weigh between 40 and 65 pounds depending on construction. All-foam twins tend to be lighter; hybrids with coils are heavier.
A twin bed fits comfortably in a room as small as 7 x 10 feet, leaving enough space to walk around. For bunk beds, make sure there's at least 2 feet of clearance between the top bunk and the ceiling.
Still deciding? Contact our team or visit one of our Los Angeles locations for a no-pressure consultation. We carry a full range of twin mattresses and can help you find the right feel and budget for your situation.
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