Cal King 72″ x 84″ A California King size bed is the longest of all mattress sizes in our guide but not the widest, making it an ideal choice for taller sleepers who are over 6 feet tall.

In terms of bed mattress sizes, a full XL has the same 54-inch width as a normal full size bed plus an extra 5 inches of length, making it as long as a twin XL, queen, and king size mattress.

Full—also called double—beds are best for couples living in small spaces, and single sleepers who won’t be bothered by the lack of length (just 75 inches, the same as a twin bed). Couples ...

Twin and twin XL mattresses are typically the most affordable sizes in a mattress line up. They're cheaper than full size mattresses, and significantly less expensive than the popular queen size bed.