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Twin Bed Dimensions

Sizes checked October 7, 2026

Atwin mattress is 38 inches wide and 75 inches long: 3 ft 2 in × 6 ft 3 in, or 97 × 191 cm. It is also called a single. That is 19.8 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 Bed dimensions in inches, feet and cm

UnitWidthLength
Inches38"75"
Feet and inches3' 2"6' 3"
Feet (decimal)3.17 ft6.25 ft
Centimeters96.5 cm190.5 cm
Meters0.97 m1.91 m

Area: 2850 square inches, 19.8 sq ft or 1.84 m². Mattress thickness is not part of the size and varies by model.

Is every twin mattress 38" × 75"?

38" × 75" is the size listed by Better Sleep Council, Casper, Saatva, and Sealy. Some makers list or build it differently:

SourceSize
Tempur-Pedic38" × 74"
Sealy (Cocoon, Posturepedic Spring, Icon)as built38" × 74.5"
Sealy (Posturepedic Hybrid)as built38" × 74"

"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 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 mattress needs a room at least 7' 2" wide and 8' 3" 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' 3". Add the frame: Casper lists twin frames at 38–43" × 77–80".

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.

Twin38" × 75"53"53"45" at the foot12'10'
Drawn to scale from above, head of the bed against the top wall. Pillows are standard size.
  • A twin leaves 53" on each side and 45" at the foot, with the headboard on one of the long walls. Twin dimensions
  • Walkways are measured from the mattress to the wall. Nightstands and dressers take space out of them.

Twin sheet sizes

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

PieceSize
Fitted sheet39" × 75", 16" pocket
Flat sheet71" × 98"
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 bed?

One standard pillow (20" x 26"). Casper and Saatva both match standard pillows to twin beds.

  • 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 twinWidth per sleeper
Twin38" × 75"—38" for one
Twin XL38" × 80"+7%38" for one
Full54" × 75"+42%54" for one, 27" each for two
  • A twin vs a twin XL: the twin XL is the same width and 5 inches longer.
  • A twin vs a full: the full is 16 inches wider and the same length.

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

Who is a twin bed for?

  • The Better Sleep Council suggests a twin for children who have outgrown a crib, and for a guest bed, daybed or bunk bed in a small room.
  • Casper says the 75-inch length comfortably fits sleepers under 6 feet. Taller sleepers should look at a twin XL.

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.