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Last Updated July 21, 2026
| MATTRESS SIZE | DIMENSIONS (Width x Length) |
|---|---|
| Twin | 38 x 75 inches |
| Twin XL | 38 x 80 inches |
| Full | 54 x 75 inches |
| Queen | 60 x 80 inches |
| King | 76 x 80 inches |
| California King | 72 x 84 inches |
Key Takeaways:
A twin-size mattress, also known as a single mattress, is 38 inches wide and 75 inches long. It's the smallest of all the standard mattress sizes and meant for a single sleeper. A twin mattress is best for kids outgrowing their crib. Children and teens can keep on using twin mattresses well into adulthood. It also works for single adults (under 6 feet tall) who have very limited bedroom space.
A twin XL mattress is 38 inches wide and 80 inches long, making it 5 inches longer than standard twin-size mattresses. This length difference contributes to the XL’s popularity in college dorms. Basically, teens who go through growth spurts outgrow their previous mattresses, so the next most popular choice is a twin XL. It can accommodate kids up to 6 feet 5 inches tall, so plenty of legroom is assured.
A full-size mattress, also called a double mattress, is 54 inches wide and 75 inches long. The mattress is called "full size" or "double" because it used to be the standard sleeping mattress for couples way back in the 1940s. But since then, the queen-size has taken over that title. Nowadays, a double bed is a spacious choice for solo sleepers, especially active ones who move around a lot and change their sleeping position a bunch (i.e., combination sleepers).
A queen mattress is 60 inches wide and 80 inches long. It's currently the most popular mattress size in the US, offering a budget-friendly option for couples to sleep comfortably together without running into space issues. Both partners will have ample legroom and width to reposition themselves without waking the other, or worse, pushing them off the bed!
Pro tip: Go for a split queen mattress (two separate mattresses, each 30 x 80 inches, forming a queen-sized bed) if you and your partner have different firmness/thickness preferences.
A king mattress is 76 inches wide and 80 inches long. Being significantly wider than a queen mattress, it's a great choice for couples who want plenty of space to sprawl out. It's also great for families who sleep together (parents, kids, pets, and all). The king is the most spacious bed in its class, with no other bed matching its 76-inch width. And to accommodate something of this size, you'll ideally need a master bedroom.
Pro tip: Go for a split king mattress (two twin XL mattresses together that form a king-sized bed) if you and your partner have different firmness/thickness preferences.
A California King mattress is 72 inches wide and 84 inches long. It's the 4-inch-narrower but 4-inch-longer version of the standard king mattress. The extra length of the Cal king size can be a big advantage for people 6 feet tall or taller, as it gives them more room to stretch their legs out. But for this additional length, you have to trade off a bit of the width. So, instead of comfortably accommodating a family of four, as the standard king can, the Cal king only accommodates a family of three. It's still great for couples, though!
[Shop California King Mattresses]
Pro tip: Go for a split California king mattress (two separate mattresses, each 36 x 84 inches, forming a cal king-sized bed) if you and your partner have different firmness/thickness preferences.
Choosing the right mattress size comes down to five things.
1. Consider how much space you have in your room. A king-size mattress in a small bedroom leaves no room to move around, and a twin in a large room is a waste of space. Measure your room before anything else. Make sure the mattress leaves at least 2 feet (24 inches) of clearance on the sides and foot of the bed.
2. Consider how many people will use the mattress. A single sleeper has plenty of room on a twin and a full. Two adults sharing a bed need at least a queen, or a king if either partner moves around a lot at night and wants more personal space.
3. Consider your body weight(s) and height(s). Taller sleepers over 6 feet need a longer mattress, which rules out a standard twin or full in favor of a twin XL, queen, king, or Cal king. Heavier sleepers need a mattress with a higher weight capacity, which varies by size. Larger mattresses, like a queen, can support more weight than smaller ones, like a twin.
4. Consider long-term plans. If you're moving soon, especially to a bigger place, sizing up now saves you from having to buy again in a year. A queen works in most bedrooms. A king needs a larger room so as not to feel cramped.
5. And finally, consider your budget. Larger mattresses cost more, and so does the bedding that goes with them. A queen is the best balance of space and cost for most people. A king is worth the investment if you share a bed and have the room for it.
Here's a little infographic to help you out with picking the correct mattress size for your lifestyle:
This table covers all the standard US mattress sizes in feet and in centimeters.
| MATTRESS SIZE | DIMENSIONS IN FEET (Width x Length) |
DIMENSIONS IN CM (Width x Length) |
|---|---|---|
| Twin | 3.17 x 6.25 feet | 96.52 x 190.5 cm |
| Twin XL | 3.17 x 6.67 feet | 96.52 x 203.2 cm |
| Full | 4.5 x 6.25 feet | 137.16 x 190.5 cm |
| Queen | 5 x 6.67 feet | 152.4 x 203.2 cm |
| King | 6.33 x 6.67 feet | 193.04 x 203.2 cm |
| California King | 6 x 7 feet | 182.88 x 213.36 cm |
This table covers all the popular non-standard mattress sizes available today.
| NON-STANDARD MATTRESS SIZE | DIMENSIONS (Width x Length) |
|---|---|
| Crib | 28 x 52 inches |
| Full XL | 54 x 80 inches |
| California Queen | 60 x 84 inches |
| Olympic Queen | 66 x 80 inches |
| Super King | 72 x 78 inches |
| Texas King | 80 x 98 inches |
| Alaskan King | 108 x 108 inches |
Before we conclude, note that we have a separate international mattress size guide and a mattress sizes Canada guide that you might want to check out for further comparison.
Related blog posts:
2. Twin vs. Full vs. Queen Mattress Size Comparison
5. Wyoming King vs. Alaskan King vs. Texas King
Disclaimer: What is said in this article has been referenced from multiple sources and is intended only for educational and informational purposes. Please note that no content in this article is a substitute for professional advice from a qualified doctor or healthcare provider. Always consult an experienced doctor with any concerns you may have regarding a health condition or treatment, and never disregard any medical suggestions or delay in seeking treatment because of something you read here.
