Full XL mattresses measure 54" x 80" — five inches longer than a standard full. Here's who actually needs one, what sheets fit, and where to find one in Los Angeles.
The Full XL is the mattress size most people don't know exists until they need it. It solves a specific problem — a sleeper who is too tall for a standard full but doesn't have the floor space for a queen — and it solves it well. The catch is that it's uncommon enough that finding one, and finding sheets for it, takes a little more effort than picking a queen off the showroom floor.
Here are the exact numbers and the practical considerations before you commit.
A Full XL mattress measures 54 inches wide by 80 inches long — 4.5 feet by 6 feet 8 inches. That's the same width as a standard full and the same length as a queen, king, or California king (well, five inches shorter than a Cal King).
Here's how it sits among the standard sizes:
So the Full XL gives you five extra inches of length over a full, and gives up six inches of width compared to a queen. In a bedroom where the wall you're placing the bed against is narrow but the room runs deep, that trade is exactly right.
This is the main use case. A standard full is 75 inches — 6 feet 3 inches. If you're 6'0" or taller, your feet are at or past the edge, and adding a pillow pushes you further down. Five extra inches fixes it without adding to the room's width requirement. If height is your main issue, our guide to the best mattress for tall people covers what else to look for beyond length.
Some universities equip rooms with Full XL frames rather than the more common Twin XL. If you're buying for a dorm, confirm the size with housing before ordering — the two are frequently confused.
A lot of older Los Angeles apartments — the 1920s and 1930s buildings around Koreatown, Hollywood, and Mid-Wilshire especially — have bedrooms that are long and narrow. A queen leaves you turning sideways to get past the foot of the bed. A Full XL preserves the walkway and still sleeps a tall adult comfortably.
Two Full XL mattresses side by side create a 108" wide bed. That's wider than a standard king and useful for couples who want fully independent adjustable bed positions with more personal space than a split king's two Twin XLs provide.
Bedding is harder to find. Full XL sheet sets exist but you won't find them in every store, and the selection of colors and materials is thinner. Buy sheets at the same time you buy the mattress so you're not scrambling.
Fewer models to choose from. Most brands build twin, twin XL, full, queen, king, and Cal king as standard, and treat Full XL as a special order. That means fewer firmness options and sometimes a longer lead time.
Frames need checking. Many full frames won't accommodate the extra five inches. Adjustable and platform bases in Full XL are available but limited — confirm compatibility before buying either piece. Our breakdown of foundations and bases is a good starting point.
Still narrow for two. At 54 inches wide, two adults each get 27 inches — narrower than a standard crib. It's workable for occasional shared use, not for two people every night. If that's the plan, look at full size mattresses only as a stopgap and budget for a queen.
vs. Twin XL: Same 80-inch length, 16 inches more width. If one person is sleeping there and the room allows it, Full XL is the more comfortable choice. Our Twin XL size guide covers when the narrower option makes sense.
vs. Full: Identical width, five inches longer. If you're under 5'10", the standard full is easier to shop for and cheaper. Over 6 feet, the XL is worth the hassle.
vs. Queen: Same length, six inches narrower. A queen needs roughly 10' x 10' of floor space to feel right; a Full XL works in a 9' x 10' room. If the space is there, queen wins on resale, bedding availability, and selection.
A Full XL is a mattress that measures 54 inches wide by 80 inches long. It has the same width as a standard full mattress and the same length as a queen. It's designed for taller sleepers who need the extra legroom but can't fit — or don't want — a wider bed.
54" x 80", or 4 feet 6 inches by 6 feet 8 inches. That's five inches longer than a standard full (54" x 75") and six inches narrower than a queen (60" x 80"). Mattress height varies by model, typically 10 to 14 inches.
Yes, though it's one of the less common sizes and many retailers don't stock it. Most manufacturers produce Full XL as a special-order size rather than keeping it on the floor. Expect a smaller model selection and possible lead time compared to queen or full.
Not properly. A full fitted sheet is cut for a 75-inch length, so on an 80-inch mattress it will pull off the corners or refuse to tuck at all. Buy sheets labeled Full XL. Flat sheets and comforters sized for a full will usually work fine since they don't need to grip the corners.
A Full XL topper, if you can find one. A standard full topper will leave five inches of mattress uncovered at the foot, and a queen topper will overhang the sides by six inches and bunch against the frame. Our guide to mattress toppers covers thickness and material choices once you've sorted the size.
Only length. Both are 54 inches wide. A full is 75 inches long; a Full XL is 80 inches. Everything else — construction, firmness options, price range — is comparable, though the Full XL costs slightly more and is harder to source.
Mattress sizes are one of the few things genuinely worth checking in person. Five inches sounds trivial on paper and feels obvious once you lie down. Our five Los Angeles showrooms carry the full size range, we can special-order Full XL, and same-day delivery is available across most of LA.
Not sure whether length or width is your real constraint? Take our short sleep quiz and we'll narrow it down for you — and every mattress comes with our free 120-night comfort guarantee.
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