01Full Mattress Size: Exact Dimensions, Who It Fits, and How It Compares

A full mattress — also called a double — is one of the most common sizes in American bedrooms, but it's often misunderstood. Many buyers assume it's a good fit for couples. It usually isn't. But for the right sleeper, it's one of the best value-per-square-foot options you can buy.

Here's everything you need to know before buying a full-size mattress.

03Full Mattress Dimensions

A standard full mattress measures 54 inches wide by 75 inches long (137 cm × 191 cm).

That's 15 inches wider than a twin, but 6 inches narrower than a queen. For a single adult, those 54 inches of width are usually comfortable. For two adults, it gets tight — each person has about 27 inches of space, which is narrower than a twin XL.

04Who a Full Mattress Is Right For

Best fit:

  • Single adults who want more room than a twin but don't need queen-size space
  • Teens and young adults — a practical upgrade from a twin that still fits most rooms
  • Guest rooms — accommodates most single guests comfortably, and occasionally two smaller guests
  • Smaller bedrooms where a queen would be too tight around the furniture
  • Sleepers under 6 feet who don't need extra length (the 75-inch length is the limiting factor for taller people)

Not ideal for:

  • Most couples — the 27 inches per person is noticeably cramped; a queen is almost always the better choice
  • Sleepers taller than 6'2" — feet will hang off; consider a Full XL or Queen instead
  • Active sleepers who move around a lot and want more surface area

05Full vs. Other Sizes: Side-by-Side

Size Dimensions Best For Avg. Price Range
Twin 38" × 75" Kids, bunk beds, very small rooms $
Twin XL 38" × 80" Tall singles, college dorms $
Full 54" × 75" Single adults, guest rooms, smaller bedrooms $$
Full XL 54" × 80" Taller single adults who like a full's width $$
Queen 60" × 80" Couples, single adults who want more space $$–$$$
King 76" × 80" Couples who want maximum space $$$

The jump from full to queen is 6 inches in width and 5 inches in length. For many single adults, that extra space isn't worth the price difference. For couples, it almost always is.

06Full vs. Full XL: Which Should You Choose?

The Full XL is the same 54 inches wide but adds 5 extra inches of length — bringing it to 54" × 80". That matches the length of a queen and king.

Choose a Full XL if:

  • You're between 5'11" and 6'3" and want a full-width mattress that fits your length
  • You want future flexibility — Full XL fits the same frames as standard fulls in most cases

The tradeoff: Full XL mattresses have a smaller selection than standard fulls. If you find the mattress model you want only comes in Full (not Full XL), a Queen may be a better alternative for tall sleepers.

07Room Size Requirements

A good rule of thumb: leave at least 24 inches of clearance on each side and at the foot of the bed for comfortable movement around the room.

Room Size Full Mattress Fit
9' × 9' Tight — works, but minimal clearance
10' × 10' Comfortable — standard minimum recommended
10' × 12' Good — room for nightstands on both sides
12' × 12' or larger Plenty of room — consider whether a queen would fit just as well

If you're deciding between a full and a queen due to room size, measure carefully — the difference is only 6 inches in width. In a 10' × 12' room, a queen often fits just as well as a full.

08Frequently Asked Questions

Is a full mattress the same as a double mattress?

Yes. Full and double are two names for the same size: 54 inches wide by 75 inches long. The term "double" is older and less commonly used today, but you'll still see it on some mattress labels and bed frames.

Can two people sleep on a full mattress?

Technically yes, but it's tight. Each person gets about 27 inches of width — less than a twin. Some couples make it work, especially if both are on the smaller side, but most find a queen significantly more comfortable for long-term co-sleeping.

What bed frame works with a full mattress?

Any frame or foundation labeled "full size" or "double." Full-size frames are widely available and among the most affordable. Most platform beds, box springs, and adjustable bases come in full size.

Is a full mattress good for a guest room?

It's one of the most popular choices for guest rooms. It fits most single guests comfortably, takes up less floor space than a queen, and costs less. For a dedicated guest room that will occasionally sleep two, a queen is the safer choice.

How much does a full mattress cost?

Full mattresses generally run from around $300 on the lower end to $1,500+ for premium models. They typically cost less than a queen of the same model, making them a good value option when the size fits your needs.

Where can I try a full mattress in Los Angeles?

Any of our 5 LA Mattress Store locations carry full-size mattresses across multiple brands and firmness levels. Our staff can help you compare sizes in person so you can decide if a full, full XL, or queen is the right fit for your room and sleep style.

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