Full Size Bed & Mattress Dimensions & Measurements: Width & Length
Full Mattress Dimensions are 54" x 75"
Full size mattresses measure 15" wider than Twin beds and 5" shorter than a Queen bed. This size is a good option for a guest room or as a child's step-up mattress. It's also the size of a convertible crib bed frame.
Pros: Full mattresses fit into smaller rooms, and sheets are less expensive than they are for a queen or king size mattress. You also have the option of using Queen size sheets, which will have more drop length.
Cons: Many people find the size of a full mattress too narrow for 2 adults with only 27" in width for each person. A full mattress may also be too short for taller individuals.