by A Twin XL mattress is the go-to choice for college dorms, teenagers, and tall solo sleepers. It's 5 inches longer than a standard twin -- and most dorm beds are built for it.
Twin XL Dimensions
Twin XL: 38 inches wide x 80 inches long. Compare to standard twin (38" x 75") -- same width, 5 inches longer. That extra length makes a real difference if you're 6+ feet tall.
Twin vs Twin XL
| Factor | Twin (38" x 75") | Twin XL (38" x 80") |
|---|---|---|
| Length | 75 inches | 80 inches |
| Fits sleepers up to | ~5'10" | ~6'4" |
| Dorm compatible? | Sometimes (check) | Yes, most dorms use XL |
| Price difference | -- | +$20-$50 typically |
Who Should Buy a Twin XL?
- College students -- most dorm frames use 38" x 80" dimensions. Always verify with your school
- Tall teenagers -- once a teen hits 5'10"+, standard twin at 75" becomes too short
- Split king setups -- two Twin XL mattresses side by side equal a king (76" x 80")
Best Twin XL Mattresses 2026
Best budget: Sweetnight Island Twin XL at $249 -- exceptional value for dorm use, arrives compressed, easy to move.
Budget Pick
Sweetnight Twilight Hybrid — From $329
Medium-firm 6/10, pocket coils, HSA eligible. 100-night trial.
Best for tall sleepers: Amerisleep AS2 Twin XL at $1,099 -- plant-based foam, firm support, 20-year warranty. Built to last all four years of college and beyond.
Frequently Asked Questions
Frequently asked questions about this size
Our default pick at this size
Saatva Classic — Twin XL $1,099
The Saatva Classic is the most-ordered luxury hybrid on the US market and ships in every standard size. Zoned lumbar support, 365-night home trial, lifetime warranty, free white-glove delivery + old-mattress removal included.
Twin XL dimensions and who's it for?
Twin XL is 38" × 80" — the narrow twin width, but 5" longer. Standard in US college dorms. Also used as the half-pair in split-king adjustable bed setups.
Is twin XL big enough for a tall adult?
Width-wise it's a single-sleeper size. Length-wise 80" fits sleepers up to about 6'2". Above that, look at cal-king or a custom-long.
What is the exact Twin XL mattress size?
Twin XL measures 38 inches wide by 80 inches long. It's the same width as a standard twin but 5 inches longer -- designed for taller sleepers and college dorm beds.
Do all dorms use Twin XL beds?
Most US college dorms use Twin XL (38" x 80") frames, but not all. Always confirm the dimensions your specific dorm requires before purchasing.
Can two Twin XL mattresses make a King?
Yes -- two Twin XL mattresses placed side by side create a Split King (76" x 80"), the same dimensions as a standard king. This is the standard configuration for adjustable bed bases where each side adjusts independently.
Frequently asked questions
What should I know about twin xl size?
Twin XL measures 38" x 80" — same width as Twin, but 5 inches longer. This is the standard dormitory size because 80" accommodates most adults up to 6'4". Twin XL is also half of a split king setup.
What should I know about twin xl mattress topper?
Twin XL toppers measure 38" x 80" — the same as the mattress. A regular Twin topper (38" x 75") will leave 5 inches of mattress exposed at the foot. Most memory-foam and latex toppers come in both sizes; budget toppers sometimes stock Twin only.
What should I know about twin xl mattress dimensions?
Twin XL measures 38" x 80" — same width as Twin, but 5 inches longer. This is the standard dormitory size because 80" accommodates most adults up to 6'4". Twin XL is also half of a split king setup.
What should I know about twin xl length?
Twin XL measures 38" x 80" — same width as Twin, but 5 inches longer. This is the standard dormitory size because 80" accommodates most adults up to 6'4". Twin XL is also half of a split king setup.
What should I know about twin bed and twin xl?
Twin XL toppers measure 38" x 80" — the same as the mattress. A regular Twin topper (38" x 75") will leave 5 inches of mattress exposed at the foot. Most memory-foam and latex toppers come in both sizes; budget toppers sometimes stock Twin only.