With a measurement of 76 by 80 inches, a king bed is wider than the queen bed, which is 60 by 80 inches. The king is not the largest of all beds. A California king bed measures 72 by 84 inches, while a grand king measures 80 by 98 inches.
Mattress size can vary by country, as each country sets their own standard for measurements. For instance, a queen bed in Japan measures 61 by 77 inches. Some countries have bed sizes not offered in the United States. Australia and New Zealand have a size called "king single," which has a measurement of 42 by 76 inches in Australia and 42 by 80 inches in New Zealand.