King Size Bed & Mattress Dimensions & Measurements: Width & Length
King Mattress Dimensions are 76" x 80"
King size mattress dimensions are 76" x 80". King beds are growing in popularity. King mattress dimensions are about 16" wider than a Queen bed. Both are about 80" long. The Eastern King size mattress is the only bed to give each person the same width as a Twin bed. In fact you can push 2 Extra-Long Twin beds together to be the same size as an Eastern King mattress. This is a good way to have a versatile guest room (use 2 twins separately or push together to make a king bed for couples). An Eastern King bed comes with one mattress and two half-width box springs to be more manageable when moving. Approx. width per person: 38"
Pros: This is the widest standard bed available. Roomy enough for 2 large adults. The 80" length comfortably accommodates most people. Bed sheets are easy to find and are generally labeled simply "King".
Cons: This is a very large mattress that may not fit easily up stairs or into smaller rooms. (Check bendability on king size mattresses.) Taller people may prefer the California King instead with its longer length. All bedding is most expensive in king sizes, and 3 standard pillows or 2 king pillows are needed for this width.