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Quick Answer. A double size bed, commonly referred to as full size, measures 54 inches wide by 75 inches long. The height varies from as little as 4 inches to over 17 inches, depending on manufacturer and construction. Continue Reading.
A standard twin bed, or single bed, is designed for one person. They are 39 inches (100 cm) wide and 75 inches (190 cm) long. These types of beds are popular for kids, and are often found in day beds and trundle beds as well. Bedding is easy to find for a standard twin bed. An extra long twin bed is very common in college dorm rooms.