A full size bed, also known as a double bed, measures 54 inches wide by 75 inches long. This size provides 16 inches more width than a twin bed but is smaller than a queen bed, which measures 60 inches wide by 80 inches long

. In summary:

• Width: 54 inches (137 cm)
• Length: 75 inches (190.5 cm)

This size is suitable for a single adult who wants more space than a twin bed or for smaller rooms where a queen or king bed would be too large. However, it may be cramped for two adults to share comfortably