Twin beds are frequently used for a child's bedroom or in guest rooms. Many college dorms also have twin beds, but they are extra long to fit older teens and young adults. They're narrow and may have a trundle under the bed to hold personal belongings. Twin beds are 39 inches, or just over 3 feet, wide and 75 inches long. Extra long twin beds are 80 inches long to accommodate taller individuals.
Double or Full Size
Double beds, also known as full-size beds, are 54 inches wide and 75 inches long. While they are wider than twin beds, they decrease the amount of space allotted for each person to 27 inches, as opposed to 39 inches for a single bed. Like twin beds, they fit into a smaller space but have a tendency to be too short for anyone who is taller than 5 1/2 feet
A queen bed is wider than a double bed by 6 inches at 60 inches wide, while it is 5 inches longer at 80 inches total. Each person has 30 inches of space, still smaller the per person space allotted by a twin bed, but certainly adequate for most couples.
King beds are available in standard form, also known as Eastern king, and California king, also known as Western King. Eastern kings favor width over length, measuring 76 inches wide and 80 inches long while Western king beds are 72 inches wide but 84 inches long to fit taller people. King beds offer the most space for each person but bedding is the most expensive because of their large size.