Twin vs twin XL

Same width, five more inches of length, and that's the whole difference.

Two kids have a pillow fight across a pair of twin beds while a beagle puppy watches in a cheerful shared bedroom

Short answer: both are 38 in wide; a twin is 75 in long and a twin XL is 80 in, as long as a queen or king.^{[1 · Oct 29, 2026]} A twin suits children, teens and adults under 6 ft; a twin XL suits teens and adults over 6 ft.^{[1 · Oct 29, 2026]}

	Twin	Twin XL
Size	38 × 75 in^{[1 · Oct 29, 2026]}	38 × 80 in^{[1 · Oct 29, 2026]}
Centimeters	97 × 191 cm	97 × 203 cm
Surface area	2,850 sq in^{[1 · Oct 29, 2026]}	3,040 sq in^{[1 · Oct 29, 2026]}
One maker's minimum room	7′ × 10′^{[2 · Oct 29, 2026]}	7′ × 10′^{[2 · Oct 29, 2026]}

Choose a twin if

It's for a child; it's an affordable size with frames and bedding that are easy to find.^{[1 · Oct 29, 2026]}
The sleeper is under 6 ft.^{[1 · Oct 29, 2026]}
It's for bunk beds or a small room.^{[2 · Oct 29, 2026]}

Choose a twin XL if

The sleeper is over 6 ft, or a teen who's still growing.^{[1 · Oct 29, 2026]}
It's for a dorm.^{[2 · Oct 29, 2026]}
You may build a split king later: two twin XLs side by side are 76 × 80 in, a king's footprint (our arithmetic).^{[1 · Oct 29, 2026]}

Keep in mind: twin XL sheets and accessories can be harder to find and cost more,^{[1 · Oct 29, 2026]} and a twin can be outgrown.^{[1 · Oct 29, 2026]} Twin sheets won't fit a twin XL's extra length, so buy bedding labeled for the size you have.

Sources: 1. Sleep Foundation, Mattress sizes and dimensions guide. 2. Casper, Queen size bed dimensions: size, room fit, and how it compares. Checked Oct 29, 2026. Trademarks belong to their owners; figures are restated in our own words and tables, not reproduced.