A twin mattress measures 38 inches wide by 75 inches long (approximately 3.17 feet by 6.25 feet). It is the smallest traditional mattress size, ideal for single sleepers such as children, teenagers, or adults who are under 6 feet tall. This size is commonly used in small bedrooms, bunk beds, or studio apartments due to its compact footprint
. In metric units, a twin mattress is about 96.5 cm wide and 190.5 cm long
. The minimum room size recommended to fit a twin mattress comfortably is around 7 feet by 9 feet (about 2.1 m by 2.7 m), though a slightly larger room may be needed if additional furniture is included
. For taller individuals or those needing extra length, a Twin XL mattress is available, which is the same width (38 inches) but 5 inches longer (80 inches long)
