King Bed Inches. Standard king size beds and queen size beds differ in width but not in length. Standard bed sizes are based on standard mattress sizes, which vary from country to country.
The allowable width per person is 36 inches.
Standard bed sizes chart (in centimeters), us and european sizes. King size beds are 76 inches by 80 inches which is a full 16 inches wider than a queen. King bed has been standardized at 80 x 76 inches. Standard king or eastern king beds are about 16 wider than a queen bed and the same length.