The standard mattress sizes in the United States include Twin, Twin XL, Full, Queen, King, and California King, each with distinct dimensions and ideal use cases.
A Twin mattress measures 38 inches wide by 75 inches long, making it suitable for children, single sleepers, or guest rooms. A Twin XL extends the length to 80 inches, providing additional space for taller individuals or college dorms.
The Full mattress, also known as a Double, is 54 inches wide and 75 inches long, offering more room than a Twin and fitting well in smaller rooms or for growing children. A Full XL variant increases the length to 80 inches, accommodating taller sleepers.
The Queen mattress is the most popular size, measuring 60 inches wide by 80 inches long, and is ideal for couples who do not have children or pets sharing the bed, or for individuals who prefer extra space. It fits best in bedrooms with a minimum size of 10 feet by 10 feet.
The King mattress is 76 inches wide and 80 inches long, providing ample space for couples, families, or those who share their bed with pets. It requires a room of at least 12 feet by 12 feet to accommodate comfortably.
The California King is slightly narrower at 72 inches wide but longer at 84 inches, making it ideal for taller individuals or couples who need extra length. It also requires a room of at least 12 feet by 12 feet.
Additional specialty sizes exist, such as Split Queen (30 inches wide by 80 inches long) and Split California King (36 inches wide by 84 inches long), designed for adjustable bed frames where each side moves independently. Other specialty sizes include RV-specific options like Short Queen (60 inches by 75 inches), RV King (72 inches by 80 inches), and various waterbed and truck sleeper cab sizes.
Room size recommendations vary by mattress type, with a general guideline of 24–30 inches of walking space on each side and at the foot of the bed. The surface area of a Queen mattress is approximately 33.3 square feet, while a King is about 42.2 square feet, and a California King is 42.0 square feet.
Guide to mattress sizes
A guide to mattress dimensions and bed sizes
Ah yes, the Alaskan king size for when you wanna have adult sleepovers.
More on reddit.comWhat size bed do you have?
mattress size
What are the less common mattress sizes?
Three-quarter, Olympic Queen, and waterbeds fall into this category.
What’s the most popular mattress size?
Queen, since some bedrooms cannot accommodate a king size.
Can I use a mattress topper to make my mattress feel bigger?
Only in comfort, not in actual dimensions.