The typical width for a queen-size headboard is approximately 62 inches wide. The height of a headboard is dependant on style and design, and there's no standard dimension for a queen-size headboard. Queen-size mattresses are 60 inches wide, so headboards need to be at least this width to match.
Beds are available in several standardized sizes, dependent on mattress dimensions, and are categorized by name. Queen-size beds are usually 60 inches wide by 80 inches long, although this size can vary between countries. The largest bed size is the California king size at 72 inches wide and 78 inches long.