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Mattress Size Reference Guide

An Industry Trade Association has established standards for mattress sizes that includes allowable variances. Below is a detailed explanation of these standards.

Mattress Variation Standards

The chart below outlines mattress sizes as per industry standards with acceptable variance ranges.

Finished Mattress Sizing Variations

Mattress Size	Industry Standard Dimensions (+/-1/2")	Allowable Variance (Length & Width)	Min. Width	Min. Length
Twin	38" x 74.5"	-0.5"	37.5"	74"
Twin XL	38" x 79.5"	-0.5"	37.5"	79"
Full	53" x 74.5"	-0.5"	52.5"	74"
Queen	60" x 79.5"	-0.75"	59.25"	78.75"
King	76" x 79.5"	-0.75"	75.25"	78.75"
Cal King	72" x 83.5"	-0.75"	71.25"	82.75"

All dimensions are in inches.
Finished sizes are measured from outside to outside of tape edge at the centerlines of the width and length.
The distance is measured between extreme outside edges of finished construction.

A twin XL mattress measures 38 inches wide by 80 inches long, offering an additional 5 inches in length compared to a standard twin mattress. This extra length makes it a great choice for taller sleepers who need more legroom without taking up too much space in the room. Twin XL mattresses are commonly found in college dorm rooms and compact guest rooms where maximizing comfort and space is a priority. Despite its extended length, the twin XL retains the narrow width of a twin mattress, making it an excellent option for small bedrooms.

A twin XL mattress is ideal for taller individuals, as it provides ample legroom while maintaining a compact width. It’s commonly used by college students in dorm rooms, as the extended length accommodates a variety of sleepers comfortably. Teenagers and adults who sleep in smaller rooms, like studio apartments or guest rooms, also benefit from the space-efficient design of a twin XL mattress. Additionally, it’s a popular choice for those who want the flexibility to combine two twin XL mattresses to create a split king setup for couples.

Yes, placing two twin XL mattresses side by side creates the same dimensions as a king-size bed, measuring 76 inches wide by 80 inches long. This configuration, commonly known as a split king bed, is perfect for couples who want individual comfort adjustments on each side, such as different firmness levels or adjustable base settings. It offers the same width and length as a traditional king bed but provides the added benefit of customization. For those who prefer extra length, a California king is a suitable alternative, offering a slightly narrower but longer sleeping surface.

The key difference between a twin mattress and a twin XL mattress lies in their length. A standard twin measures 38 inches wide by 75 inches long, making it a great choice for children, teens, or smaller bedrooms. In contrast, a twin XL extends to 80 inches in length, offering additional legroom for taller individuals. Both sizes share the same width, but the twin XL is better suited for adults or teenagers who need more space to stretch out comfortably.

A twin XL mattress cannot properly fit on a standard twin bed frame because the mattress is 5 inches longer. Attempting to use a twin XL mattress on a twin frame would result in unsupported areas, potentially causing damage to the mattress or discomfort for the sleeper. To ensure proper support and durability, it's essential to use a bed frame designed for twin XL mattresses, or a universal bed frame that can be adjusted to fit multiple bed sizes.

Yes, twin XL mattresses are fully compatible with adjustable bases. These bases allow users to elevate the head, feet, or both, offering enhanced comfort and support for various activities, such as reading or watching TV in bed. Adjustable bases are especially popular with twin XL mattresses because they are often used in split king configurations, where each side can be adjusted independently. This flexibility makes them a fantastic choice for couples who have different sleeping preferences or health needs.

Yes, twin XL mattresses require specially sized bedding to fit their unique dimensions of 38 inches wide by 80 inches long. twin XL sheet sets are designed to provide a snug and secure fit, preventing bunching or slipping. For a complete sleep setup, pair these sheets with high-quality pillows to enhance comfort and support. Properly sized bedding not only improves the overall aesthetic of your bedroom but also ensures a more comfortable and restful sleep experience.

Mattress Size Reference Guide

An Industry Trade Association has established standards for mattress sizes that includes allowable variances. Below is a detailed explanation of these standards.

Mattress Variation Standards

The chart below outlines mattress sizes as per industry standards with acceptable variance ranges.

Finished Mattress Sizing Variations

Mattress Size	Industry Standard Dimensions (+/-1/2")	Allowable Variance (Length & Width)	Min. Width	Min. Length
Twin	38" x 74.5"	-0.5"	37.5"	74"
Twin XL	38" x 79.5"	-0.5"	37.5"	79"
Full	53" x 74.5"	-0.5"	52.5"	74"
Queen	60" x 79.5"	-0.75"	59.25"	78.75"
King	76" x 79.5"	-0.75"	75.25"	78.75"
Cal King	72" x 83.5"	-0.75"	71.25"	82.75"

All dimensions are in inches.
Finished sizes are measured from outside to outside of tape edge at the centerlines of the width and length.
The distance is measured between extreme outside edges of finished construction.

Twin XL Mattresses

sealy

Sealy Correct Comfort Bradford Hill Twin Xl Mattress (4.8)

casper

Casper Cloud One Twin Xl Mattress (4.3)

stearns and foster

Stearns & Foster Lux Hybrid Elite Medium Twin Xl Mattress

beautysleep

Beauty Sleep Oceana Mist Medium Hybrid Twin XL Mattress (4.7)

posturepedic

Sealy Posturepedic Brierwood Twin XL Mattress (4.2)

therapedic

Therapedic Everdeen Twin Xl Mattress (3.8)

therapedic

Therapedic Branston Twin Xl Mattress

therapedic

Therapedic Darlington Twin Xl Mattress (4.3)

beautyrest world class

Beautyrest World Class Level Three Medium Pillow Top Twin XL Mattress (3.7)

beautyrest harmony lux

Beautyrest Harmony Lux Medium Twin XL Mattress (4.1)

casper

Casper One Twin XL Mattress (4.5)

beautyrest world class

Beautyrest World Class Level Four Plush Pillow Top Twin XL Mattress

tempur-pedic

Tempur-Pedic Adapt Medium Twin XL Mattress (4.4)

posturepedic pro

Sealy Posturepedic Hybrid Sonterra Twin XL Mattress

posturepedic pro

Sealy Posturepedic Pebblebrook Twin XL Mattress

stearns and foster

Stearns and Foster Lux Estate Firm Pillow Top Twin XL Mattress (3.9)

stearns and foster

Stearns and Foster Lux Estate Soft Pillow Top Twin XL Mattress

stearns and foster

Stearns and Foster Lux Estate Medium Pillow Top Twin XL Mattress (3.7)

stearns and foster

Stearns and Foster Lux Hybrid Soft Twin XL Mattress

stearns and foster

Stearns and Foster Estate Extra Firm Tight Top Twin XL Mattress

tempur-pedic

Tempur-Pedic ProBreeze Medium Twin XL Mattress (4.5)

beautyrest black

Beautyrest Black Series Three Plush Pillow Top Twin XL Mattress (4.7)

beautyrest black

Beautyrest Black Series One Extra Firm Twin Xl Mattress (4.5)

casper

Casper Snow 2.0 Twin XL Mattress (4.5)

Mattress Size Reference Guide

Mattress Variation Standards

Frequently Asked Questions About Twin XL Mattresses

Mattress Size Reference Guide

Mattress Variation Standards

Frequently Asked Questions About Twin XL Mattresses

Sealy Correct Comfort Bradford Hill Twin Xl Mattress
(4.8
)

Casper Cloud One Twin Xl Mattress
(4.3
)

Beauty Sleep Oceana Mist Medium Hybrid Twin XL Mattress
(4.7
)

Sealy Posturepedic Brierwood Twin XL Mattress
(4.2
)

Therapedic Everdeen Twin Xl Mattress
(3.8
)

Therapedic Darlington Twin Xl Mattress
(4.3
)

Beautyrest World Class Level Three Medium Pillow Top Twin XL Mattress
(3.7
)

Beautyrest Harmony Lux Medium Twin XL Mattress
(4.1
)

Casper One Twin XL Mattress
(4.5
)

Tempur-Pedic Adapt Medium Twin XL Mattress
(4.4
)

Stearns and Foster Lux Estate Firm Pillow Top Twin XL Mattress
(3.9
)

Stearns and Foster Lux Estate Medium Pillow Top Twin XL Mattress
(3.7
)

Tempur-Pedic ProBreeze Medium Twin XL Mattress
(4.5
)

Beautyrest Black Series Three Plush Pillow Top Twin XL Mattress
(4.7
)

Beautyrest Black Series One Extra Firm Twin Xl Mattress
(4.5
)

Casper Snow 2.0 Twin XL Mattress
(4.5
)