Yes, a split king is bigger than a California king because a standard king is bigger, if only by a small margin. A standard king offers 6080 square inches, while a California king offers 6048 square inches.

While a single person can purchase a king mattress if they want to, it’s not necessary. Queen mattresses are more than enough for a single person. It’s unlikely a single person would be able to take up all the space on a king bed, but if you have a big enough bedroom and a comfortable budget, nobody’s stopping you from getting one.

Most split king beds come with an iron plate connector to keep the beds together, but if you DIY’d your split king and bought two twin XL beds separately, there are other solutions you can try. An easy way to keep a split king mattress together is by using a fitted bed frame. The railing will keep the two mattresses in place, minimizing the risk of them slipping out of place or coming apart. You can also use a non-slip mattress pad or dual-sided tape between the mattresses and the foundation. The resistance from the padding or tape will stop the mattresses from shifting.