Full / Double Mattress Size Guide
The Full (or Double) is 16 inches wider than a Twin — the standard step up for solo adults who want more room to sprawl without committing to a Queen.
About the Full / Double Size
The Full mattress (also called a Double) measures 54 inches wide by 75 inches long. It's the smallest size that most adults would consider for primary use — the 54-inch width gives a solo sleeper 27 inches of personal space, which is only marginally less than the width of a standard Twin. For single sleepers in their twenties or first apartments, the Full is a common step up from childhood Twin beds. For two adults, a Full is technically possible but cramped — each person gets the same width as a crib mattress. The Full shares the Twin's 75-inch length, making it unsuitable for people over 5'9" without their feet hanging off. For taller adults, the Full's limitation on length is a significant drawback compared to the more widely available Queen. Room size requirements are modest — a Full works in bedrooms as small as 9×10 feet.
Best For
- ✓Solo adults in small apartments
- ✓Single adults transitioning from Twin
- ✓Guest rooms
- ✓Teenagers
- ✓Smaller master bedrooms
Not Ideal For
- ✗Two adults (too narrow)
- ✗Adults over 5'10" (choose Queen or larger)
- ✗Primary beds for couples
Top Mattresses Available in Full
Best for: Budget shoppers · Back sleepers
Why it stands out: Cooling gel Memory Foam and a cool-to-touch top fabric
Keep in mind: Firm feel provides less cushioning than the taller Relax and Supreme
Best for: Budget shoppers · Back sleepers
Why it stands out: Low current pricing for a foam-and-coil hybrid
Keep in mind: This legacy route represents the same current Walmart item as the 10-inch Hybrid catalog row
Best for: Budget shoppers · Side sleepers
Why it stands out: Three-inch memory-foam comfort layer gives the Medium more contouring than a thin budget foam bed
Keep in mind: Deep memory-foam contouring can feel slower to move on than a hybrid
Buy with confidence
Try Lucid's current 10-inch Medium at home for 100 nights at Lucid
Best for: Budget shoppers · Combination sleepers
Why it stands out: Cool-to-touch fabric and multiple memory-foam layers
Keep in mind: Limited information on foam density and cover materials
Best for: Side sleepers · Back sleepers
Why it stands out: Fast-response Memory Foam and copper foam
Keep in mind: The listing uses both extra-plush and medium-firm descriptions
Best for: Side sleepers · Back sleepers
Why it stands out: Cool-to-touch top panel and three-zone foam
Keep in mind: Exact foam densities and cover fiber content are not published
Full Size — Frequently Asked Questions
Is Full the same as Double?
Yes — Full and Double refer to the same mattress size (54×75 inches). 'Double' is the older term; 'Full' is more commonly used today in the US mattress industry.
Is a Full big enough for two people?
Technically possible, but not comfortable for most couples. Two adults share only 27 inches each — the width of a Twin mattress for a child. For two adults sharing a bed regularly, a Queen is the minimum comfortable size.
How does Full compare to Queen?
A Full is 6 inches narrower (54 vs. 60 inches) and 5 inches shorter (75 vs. 80 inches) than a Queen. The Queen gives significantly more sleeping surface, especially for couples. The Full saves roughly 1–1.5 feet of room width at the expense of sleeping space.
Do Full and Queen use the same sheets?
No — Full/Double sheets and Queen sheets are different sizes. Full sheets won't fit a Queen, and Queen sheets will be loose on a Full. Always verify the size on bedding purchases.
Is a Full good for a teenager?
Yes — a Full is a common upgrade from a Twin for teenagers. It provides more room to spread out, and most teens who aren't exceptionally tall fit within the 75-inch length. Tall teenagers (5'10"+) may prefer a Queen for the extra length.