A queen is a versatile starting point for many couples, while a king provides more width and a California king adds length. For one sleeper, compare a twin XL’s length with a full’s extra width. Measure the room, frame and delivery route before choosing.
U.S. mattress sizes and dimensions
These are common nominal dimensions in inches. Individual products can vary, so check the exact model and frame specifications.
| Size | Width × length | Useful for |
|---|---|---|
| Twin | 38 × 75 in. | One sleeper and compact rooms |
| Twin XL | 38 × 80 in. | One sleeper who needs more length |
| Full / double | 54 × 75 in. | One sleeper wanting more width; compact guest rooms |
| Full XL | Approximately 54 × 80 in. | More width than twin XL and more length than full; dimensions vary by maker |
| Queen | 60 × 80 in. | Many couples or a single sleeper who likes room |
| King | 76 × 80 in. | Couples seeking more width |
| California king | 72 × 84 in. | Sleepers who value extra length |
Brooklyn Bedding’s size guide shows examples of standard and specialty dimensions; specialty sizes can vary by brand.
Which mattress size is right for you?
A twin saves floor space; twin XL adds five inches of length. A full adds 16 inches of width over a twin, but has the same 75-inch nominal length.
A queen is 60 inches wide. A king adds 16 inches of total width, which may help partners who want more personal space.
Compare the length you need with how you sleep, pillow placement and the available frame. California king adds four inches of length over a standard king.
Balance who will use the bed with room for doors, drawers, luggage and comfortable access around the frame.
King vs. California king
A standard king is 76 × 80 inches; a California king is 72 × 84 inches. The California king is four inches narrower and four inches longer. Its sheets and frame are different sizes, so do not assume king accessories will fit. See our king vs. California king comparison.
Split and specialty sizes
A split king typically uses two twin XL mattresses side by side for a combined 76 × 80-inch footprint. It can allow partners to select different feels or adjust compatible bases independently. Use two twin XL fitted sheets and check the base specifications; a shared top sheet or comforter is a personal choice.
A split California king normally uses two 36 × 84-inch halves. RV, short queen and oversized beds such as Alaskan king are not interchangeable with standard sizes. Measure the actual platform and compare the manufacturer’s listed dimensions, including corner shape.
Measure the room and delivery path
- Measure the usable floor area and mark the mattress footprint with painter’s tape.
- Add the frame’s actual outside dimensions; headboards and rails may extend beyond the mattress.
- Leave room for walking and for doors, nightstands and drawers to open. The right clearance depends on your furniture and mobility needs.
- Measure stairs, hallways, elevators and doorways. A boxed mattress may be easier to deliver, but the frame and unboxed mattress still need a route.
- Check the mattress height, including any topper, against fitted-sheet pocket depth and your preferred getting-in-and-out height.
Crib mattresses are a separate size
A crib mattress is not a small-single adult mattress. Crib and play-yard products have specific fit and safety requirements; follow the crib manufacturer’s instructions for the exact mattress size. For infant sleep, use a firm, flat mattress designed for that crib, with a fitted sheet, and keep soft bedding and pillows out of the sleep space. See CPSC crib safety guidance.
Frequently asked questions
Is full the same as double?
In common U.S. sizing, yes: both generally refer to 54 × 75 inches. Confirm the exact listing.
Is a twin XL the same length as a queen?
Both are commonly 80 inches long. Twin XL is narrower at 38 inches, compared with a queen’s 60 inches.
Will two twin mattresses make a king?
Two standard twins are generally too short. Two twin XLs typically match a standard king’s footprint.
Where can I compare mattresses?
Explore our mattress reviews or visit Yawnder in Encinitas.