Twin size mattresses are the smallest of the standard mattress sizes. They measure 39- by 75-inches, providing enough space for individuals to sleep comfortably. The selling points of the Twin size are initial price and footprint in the room. As the smallest standard mattress size, the Twin tends to cost the least for any given model and also takes up the least amount of floor space in the room. For these reasons, Twin size beds are ideal for dorm rooms, apartments, kids' rooms, and just small bedrooms. Twin size mattresses are also good for folks on a budget, though couples will not be able to share the Twin.
From a cost per square inch standpoint, Twin size beds tend to be the worst value second only to the Twin XL size. Although Twin size mattresses are half the size of a King size, they often cost around three-fourths as much. Like buying in bulk, you get more for your money with larger sizes, but have the lowest initial price with the smaller units. Upgrading to a Queen size for sharing or a Full size for extra space may be worth the money for some, but if you are a non-active single sleeper, the cost and space efficient Twin size may be best for you.