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Twin XL Dimensions

Sizes checked October 7, 2026

Atwin XL mattress is 38 inches wide and 80 inches long: 3 ft 2 in × 6 ft 8 in, or 97 × 203 cm. It is also called a twin long. That is 21.1 sq ft of sleeping space, 38" for one. Casper's minimum room size for it is 7' x 10'.

Twin38×75Twin XL38×80Full54×75
Mattress outlines drawn to scale, head of the bed at the top, in inches.

Twin XL dimensions in inches, feet and cm

UnitWidthLength
Inches38"80"
Feet and inches3' 2"6' 8"
Feet (decimal)3.17 ft6.67 ft
Centimeters96.5 cm203.2 cm
Meters0.97 m2.03 m

Area: 3040 square inches, 21.1 sq ft or 1.96 m². Mattress thickness is not part of the size and varies by model.

Is every twin XL mattress 38" × 80"?

38" × 80" is the size listed by Better Sleep Council, Casper, Saatva, Sealy, and Tempur-Pedic. Some makers list or build it differently:

SourceSize
Sealy (Cocoon, Posturepedic Spring, Icon)as built38" × 79.5"
Sealy (Posturepedic Hybrid)as built38" × 79"

"As built" sizes are the measurements Sealy publishes for its finished mattresses. A fitted sheet with some stretch covers the difference; measure the mattress itself before ordering a frame or headboard that has to fit it closely.

What size room do you need for a twin XL bed?

  • Casper: at least 7' x 10'
  • Sealy: 7' x 10'
  • Saatva: at least 7' x 10'

With the head against a wall and a 24-inch walkway on both sides and at the foot (Casper's minimum), atwin XL mattress needs a room at least 7' 2" wide and 8' 8" deep. For 36-inch walkways, which Casper says feel open and which match the minimum width of a wheelchair-accessible route in the ADA Standards, it needs 9' 2" × 9' 8". Add the frame: Casper lists twin XL frames at 38–43" × 80–83".

Check your own room, including the frame:

Room width
Room length
Walkway
Casper's minimum: walkable but tight.
Bed placement

The largest bed that fits a 10' × 12' room with 24" walkways is a king or California king.

Twin XL38" × 80"41"41"64" at the foot10'12'
Drawn to scale from above, head of the bed against the top wall. Pillows are standard size.
  • A twin XL leaves 41" on each side and 64" at the foot. Twin XL dimensions
  • Walkways are measured from the mattress to the wall. Nightstands and dressers take space out of them.

Twin XL sheet sizes

Buy sheets labeled twin XL. As an example, Brooklinen's twin XL Classic sheet set measures:

PieceSize
Fitted sheet39" × 80", 16" pocket
Flat sheet71" × 104"
Duvet cover64" × 90"
Pillowcases20" × 27"

Brooklinen says its fitted sheets fit mattresses up to 16 inches deep, with 12 to 16 inches the best fit. Flat sheet and duvet sizes vary more between brands than fitted sheets do.

What size pillows for a twin XL bed?

One standard pillow (20" x 26"), the same as a twin.

  • Standard pillow: 20" × 26" (51 × 66 cm)

See the pillow size chart for every pillow size and how many fit across each bed.

Twin vs Twin XL vs Full

SizeDimensionsArea vs twin XLWidth per sleeper
Twin38" × 75"-6%38" for one
Twin XL38" × 80"—38" for one
Full54" × 75"+33%54" for one, 27" each for two
  • A twin XL vs a twin: the twin is the same width and 5 inches shorter.
  • A twin XL vs a full: the full is 16 inches wider and 5 inches shorter.

All sizes side by side are in the bed size chart.

Who is a twin XL bed for?

  • The same width as a twin with 5 more inches of length, the same length as a queen or king. The Better Sleep Council notes it is a common size in college dorms.
  • Casper suggests it for sleepers over 6 feet tall.
  • Two twin XLs side by side make a split king.

Shopping for one? See our affordable mattress picks.

Sources

Checked October 7, 2026. Feet and centimeters are converted from inches; room sizes for a given walkway are this page's own arithmetic.