King Mattress Dimensions & Measurements: width & Length

King Mattress Dimensions 76” W. x 80” L

The King mattress dimensions measure at 76 inches wide by 80 inches in length. These dimensions are about equal to having two Twin XL mattresses put side by side. Often times the King mattress is used by couples who enjoy more space and find that the larger the mattress the more comfortable they feel. Couples with children and/or pets may also find the King mattress dimensions to be a perfect size. The King mattress is generally more expensive than smaller sizes, but can possibly save money over time if it does not need to be upgraded to a larger size (California King). The King mattress can be found in many different levels of quality and pricing. This allows for someone with smaller pockets to get a bed that fits their needs,  but also doesn’t blow the budget. When buying a mattress you need to ensure that it is comfortable and large enough for the user to enjoy a great night’s sleep. Below are a few pros and cons of the King mattress that can help you determine if this is the right size for you.

The Pros and Cons of a King Mattress


  • The King mattress dimensions are large enough to leave adequate space for couples who have children or pets that may sleep in bed with them from time to time.
  • Often the user of a King size mattress does not find themselves in need of a larger size mattress, in this case the California King. This can save money overtime and be a very great investment.
  • Comes in a variety of prices and quality.


  • The King mattress will take up a large amount of space and may not be suitable for someone who has a smaller amount of room to allow for their bed.
  • The cost of a King mattress with great quality can possibly be a bit too steep for someone watching their budget. It may save money overtime but the outright price can turn some people away.

Rest Right Mattress carries a number of different brands to name a few Nature’s SleepGlideaway, and iAdjust to help with your sleep.