What are the dimensions of a king size box spring

For standard box springs, twin sizes are usually 38 or 39 inches wide by 75 inches long, and full sizes are 53 or 54 inches wide by 75 inches long. Queen- and king-size box springs are both 80 inches long, but measure 60 inches and 76 inches wide, respectively.

Twin XL is a specialty size that has the same width as a standard twin box spring, but has an 80-inch length, similar to a queen or king. This size is commonly used in college dorms where space is limited, but the bed must be large enough to accommodate tall adults. At 72 inches wide by 84 inches long, the California King is another specialty size designed to offer more leg or body room, especially for couples.

Box springs are made to match mattresses in width and length, but manufacturers offer products with a variety of height measurements, typically ranging from 5 to 9 inches. High-profile or low-profile box springs can help raise or lower the bed to a comfortable height, especially for children and individuals with limited mobility. Also known as mattress foundations, box springs provide a supportive framework that absorbs shock, reducing the constant pressure and tension that leads to mattress wear. Box springs are usually compatible, but not required, when mattresses are paired with platform beds.

Split box springs consist of two separate box springs. For easier maneuverability, most cal king & king-size mattresses work better with split foundations. In the case of a standard king size, two xl twin box springs would be used. You might also want to consider a split box spring when moving a queen-sized mattress into a smaller bedroom area or a narrow stairwell. A queen-sized box spring may not be pliable enough to fit in your bedroom area.

Split box springs are typically only available in Queen, Cal King, King, and are sold in pairs. There are both low-profile split 4″ boxes and standard 8″ split box springs available. The option that will work best for your situation will depend on how high you want your mattress.

Split Box Spring Size Chart

Relation Questions

Will two twin box springs fit a queen? Using two twin box spring will not fit a queen. A standard queen size mattress is 60″ x 80″. One twin size box spring is 38″ x 75″, adding two twin box spring will total to 78″ x 75″.

Do 2 twin beds make a king? No two twin beds will not make a king, but two xl twin will equal to a king size. A king size mattress is 76″ x 80″. A twin xl is 38″ x 80″ by adding two together the total is 76″ x 80″.