Twin size mattresses are 39 inches in width and 75 inches in length. Sometimes they are referred to as "single" mattresses. They can accommodate one sleeper, although the length is sometimes too short for taller adults. Twin mattresses are used for bunk beds, children's rooms and smaller rooms.
Twin XL mattresses are 39 inches in width and 80 inches in length. With an added five inches of length to your sleeping space, Twin XL mattresses can be a better choice for taller people wanting a twin-size option. You can find Twin XL's in college dorms and guest bedrooms.
Full mattresses are 54 inches in width and 75 inches in length. Full mattresses are also referred to as double mattresses. They provide more width for your sleeping area than twin mattresses. Full size mattresses are ideal for one person, but could fit two people.
Queen size mattresses are 60 inches in width and 80 inches in length. Queen mattresses are the most popular mattress size in the United States. They are great for adults, teenagers, couples and children.
King size mattresses are 76 inches in width and 80 inches in length. They are usually the best mattress choice for couples, giving each person a sleeping area equivalent to a twin xl mattress. King mattresses are also good for families and individuals who share the bed with their pet.
California king size mattresses are 72 inches in width and 84 inches in length. There size is good for tall adults or sleepers looking for extra sleeping length. Cal Kings are the most common mattress size used with adjustable beds.