What is a King Bed? Typically, king-sized mattresses can accommodate at least two people, with additional room for small children and even small pets. As the largest mattress among standard sizes, a king-sized mattress is an excellent choice for people who like plenty of space to sleep. Four factors should be considered when purchasing a king-size bed: Accessibility Generally, king-size beds should be used in bedrooms measuring at least 12 feet by 9 feet. Designers recommend that a minimum of 30 inches of space around the bed be provided in a compact room so that people can move past other pieces of furniture. Whenever possible, use a king bed as the focal point of a room that is significantly larger than the recommended minimum (for example, over 16 feet wide) to fill out any remaining space. Occupants If you have to share your sleeping space with another person, a king-size mattress is a great choice. For those who will not be sharing a bed wit...