I just bought a Cal king bed, and it needs two twin box springs. Does it need XL box springs or will regular twin box springs fit?


Unfortunately, twin box springs will not work on Eastern king or California king mattresses. A regular twin is 38X74 inches long and the long twin is 38X80 inches long. A Cal king bed is 72X84 inches. Two long twins together would be 76X80 (too wide and too short.) You need to buy a box spring for the specific mattress. A king box spring will likely come in two pieces, but it shouldn't be confused with twin box springs.

Updated on December 21, 2017

Original Article:

King vs. California King Mattress Size
By Robin Edmondson