The measurements of a standard full size bed frame in the United States is 54 inches wide and 75 inches long. Bed names and measurements vary by different countries, regions and cultures.
Standard full size mattresses in the United States also measure 54 inches wide and 75 inches long. Full size beds, also known as double beds, are only 15 inches longer than a single bed. Full size beds are smaller than queen and king size beds, and are ideal for a smaller room. Full size beds can fit two people but only offer 27 inches of sleeping space for each person.