Question 1

What are full size mattress dimensions?

Accepted Answer

A standard full size mattress measures 54 inches wide by 75 inches long  -  4′6″ × 6′3″. Full mattresses are also commonly called "double" mattresses; both names refer to the same size. The minimum recommended room size for a full is 9′×10′, with 10′×12′ providing comfortable clearance for nightstands and walking room. Full mattresses fit any standard full/double bed frame without modifications.

Question 2

Is a full mattress the same as a double?

Accepted Answer

Yes. Full and double are two names for the exact same mattress size: 54" × 75". The term "double" dates back to when this size was considered large enough for two people. Today "full" is the more commonly used term in retail, but you’ll see both names used interchangeably by manufacturers and retailers. Any full bed frame fits a double mattress and vice versa  -  there is no difference.

Question 3

Full vs queen mattress  -  which should I choose?

Accepted Answer

A full (54"×75") is 6 inches narrower and 5 inches shorter than a queen (60"×80"). For a single adult in a smaller bedroom or studio apartment, a full is the smarter choice  -  it leaves more floor space without sacrificing personal sleep comfort. For two adults sharing the bed, a queen is the minimum we recommend. The 6-inch width difference matters significantly when sleeping with a partner. If your room is 10′×10′ or larger and you’ll be sharing, go queen. If you’re sleeping solo in a tighter space, full is the practical pick.

Question 4

What is the best full size mattress for adults?

Accepted Answer

For adults sleeping solo, the best full mattress depends on sleep position and preference. Side sleepers benefit from a plush to medium-soft hybrid or memory foam that relieves hip and shoulder pressure. Back sleepers do best with medium to medium-firm for lumbar support. Stomach sleepers need firm to extra-firm. For general use, a medium-firmness hybrid in full from Stearns & Foster or Helix offers the best balance of support and comfort. Our specialists can narrow it down to 2 or 3 to try in person at any of our 5 LA showrooms.

Question 5

Will a full mattress fit my room?

Accepted Answer

At 54"×75", a full mattress requires a minimum room size of approximately 9′×10′. That gives a few inches of clearance on each side. For comfortable clearance  -  room to walk on both sides and space for nightstands  -  a 10′×12′ room is recommended. If your room is smaller than 9′×10′, consider a twin or Twin XL. If your room is 10′×12′ or larger and you’re sleeping solo, a full fits with ease. Measure your room before ordering and leave at least 24" clearance on one accessible side.

Question 6

How much does a full size mattress cost?

Accepted Answer

At LA Mattress Store, full size mattresses range from $299 for a quality foam or innerspring to $1,699+ for premium models from Tempur-Pedic or Stearns & Foster. The value range for most shoppers is $399-$899, where you’ll find solid hybrid and foam options from Helix and Eastman House with strong durability and comfort. All full size mattresses include free delivery and our 120-night sleep trial.

Question 7

Is a full mattress big enough for two adults?

Accepted Answer

Technically yes, but not comfortably for most couples. At 54" wide, each person has about 27 inches  -  roughly the width of a crib mattress each. Most adult couples find this too tight for regular nightly use. If you occasionally share the bed with a partner, a full can work. If you share nightly, a queen (60" wide) is the recommended minimum. For couples who value personal space during sleep, a king is worth considering.

Question 8

What is the difference between a full and a twin mattress?

Accepted Answer

A full mattress (54"×75") is 16 inches wider than a twin (38"×75")  -  both are the same length at 75 inches. The 16-inch width difference is significant: a full offers noticeably more sleep surface for a single adult who moves during sleep or needs space. Twins are well-suited for children’s bedrooms, bunk beds, and tight spaces. Full is the natural step up for teens transitioning from a twin, and for single adults who want more room without a queen’s footprint.

Question 9

Can I try full size mattresses in person at LA Mattress Store?

Accepted Answer

Yes. We carry a deep selection of full size mattresses, and all major models are available to try in person at our 5 Los Angeles showrooms. Lying on a mattress is the most reliable way to know whether the firmness, support, and feel are right. Our specialists can help you compare models side by side with zero sales pressure. Open Mon-Sat 10am-8pm and Sun 10am-8pm at all 5 locations. Call (800) 218-3578 for directions.

Feature	Twin	You’re hereFull	Queen
Width	38"	54"	60"
Length	75"	75"	80"
vs Full	16" narrower	-	6" wider, 5" longer
Min room size	7′ × 10′	9′ × 10′	10′ × 10′
Recommended room	9′ × 10′	10′ × 12′	10′ × 12′
Best for	Kids, bunks, dorms	Solo adults, teens, studios	Couples, master beds
Price (LA)	From $299	From $299	From $439

The practical upgrade,from twin to full.

A full is 54″ wide × 75″ long.

Four ways to build a full.

Full Hybrid

Full Memory Foam

Full Latex

Full Innerspring

Top brands in full size.

Tempur-Pedic

Stearns & Foster

Helix

Every full size mattress in stock.

Twin vs Full vs Queen.

Who a full is built for.

Single adults

Teenagers

Guest rooms

Studio apartments

Smaller bedrooms

Test every full we carry, in person.

Why Buy From LA Mattress Store

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120-Night Comfort Exchange

The practical upgrade,
from twin to full.