Full Size Bed Dimensions: Complete U.S. Guide to Full Mattresses

A full-size bed—also called a double bed—measures 54 inches wide by 75 inches long (137 cm x 190.5 cm). It is 16 inches wider than a twin, making it the smallest standard mattress size that gives a single adult genuine room to spread out.

The full occupies a practical middle ground: large enough for a teenager or single adult, compact enough for smaller bedrooms and guest rooms, and the same length as a twin, so it adds width without demanding a bigger room footprint front-to-back.

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In the U.S., the standard full mattress size is 54" wide x 75" long. It is also known as a double bed—the two terms are interchangeable.

Pro Tip: A full and a twin share the same 75-inch length. If the sleeper is over 6 feet tall, consider a queen (80-inch) instead.
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Yes. "Full" and "double" refer to the same mattress size: 54 inches by 75 inches. The terms are fully interchangeable. "Double" is the older term, from an era when this was the standard couple's bed. Today, most couples choose a queen or king, and the full has become the go-to size for teens, single adults, and guest rooms.
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We recommend a minimum room size of 9 feet by 10 feet for a full bed, which leaves walking clearance on both sides. For a more comfortable layout with nightstands, a dresser, and open floor space, 10 feet by 10 feet up to 10 feet by 12 feet is ideal.

A full works well in secondary bedrooms, first apartments, and guest rooms where a queen would crowd the space.
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A full bed is an ideal option for:

Ready to upgrade? Explore Avocado's certified organic mattresses in Full.

The move from twin to full is the most common mattress upgrade in a child's life, typically between ages 10 and 14. The extra 16 inches of width accommodates growth spurts, changing sleep positions, and the simple reality that a 38-inch surface gets small fast.

The Avocado Eco Organic Kids Mattress is available in both Twin and Full, so families can upgrade without changing the material standards: the same certified organic latex, cotton, and wool, sized for the next stage. Those materials also work harder for active kids—organic wool and latex naturally regulate temperature and wick moisture, keeping the sleep surface breathable through the night.

For teens who want a mattress that carries through college and beyond, the Avocado Green Mattress in Full is built for decades of use, with a warranty of up to 25 years.
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The queen is 6 inches wider and 5 inches longer than a full (60" x 80" vs. 54" x 75").

The length difference matters more than most shoppers expect: at 75 inches, a full is just over 6'2" long. Taller sleepers should move up to a queen.
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A full XL is a nonstandard size measuring 54 inches by 80 inches—the width of a full with the length of a queen. A small number of brands offer it for taller sleepers who cannot fit a queen's width in their room. Because bedding, frames, and foundations for full XL are harder to find, most taller sleepers are better served by a queen or a twin XL, both of which use standard, widely available accessories. For every standard size, see our Mattress Sizes Guide.
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Two adults can fit on a full, but each person gets roughly 27 inches of width—less than a twin bed provides for one person. It works for short guest stays. As an everyday couple's bed, it is tight. Couples should start at queen, which provides 30 inches per person.
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The full size purchase often coincides with adolescence, when a growing body spends eight to ten hours a night in direct contact with the mattress surface. What that mattress is made of matters. Most conventional mattresses—including the bed-in-a-box models that dominate the category—are built around polyurethane or memory foam, a petroleum-derived material, along with chemical adhesives and synthetic fabrics that can emit volatile organic compounds (VOCs) into bedroom air.

Avocado full mattresses are made instead with GOTS-certified organic cotton, GOLS-certified organic latex, and organic wool—without polyurethane foam, chemical flame retardants, or fiberglass.
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Every Avocado mattress, including every full, is certified organic under GOTS at the finished-product level. GOTS certifies the entire mattress as it arrives in your home—not individual components inside an otherwise conventional product. It is one of six independent finished-product certifications our mattresses hold:

Explore our certifications to see what each standard verifies.
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The Full size is available across the Avocado lineup—Eco Organic, Eco Organic Kids, Green (Extra Firm to Ultra Plush), Luxury, Vegan, Latex, and Wool. For exact dimensions and weights by model, see: What Mattress Size Is Best for Me?
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A full mattress measures 54 by 75 inches—the right size for teens, single adults, and guest rooms. It offers 16 more inches of width than a twin in the same length, and fits comfortably in rooms as small as 9 by 10 feet.

Choosing a certified organic full mattress means the surface a growing teen or a welcome guest sleeps on has been independently verified—from the soil the cotton grew in to the finished product in the bedroom.

Sleep Better, Naturally: Explore Avocado's Organic Mattresses

A standard U.S. full mattress measures 54 inches wide by 75 inches long.

Yes. Full and double are two names for the same 54" x 75" mattress size.

It fits two adults for short stays, but each person gets only about 27 inches of width. Couples should choose a queen or larger for everyday use.

A full is 75 inches long, so it suits sleepers up to about 6 feet. Taller sleepers should choose a queen, king, or California king, all 80 inches or longer.

They are GOTS certified organic at the finished-product level and made with certified organic latex, cotton, and wool—without polyurethane foam, chemical flame retardants, or fiberglass. Each mattress holds six independent finished-product certifications.