How Wide Is a King Size Waterbed

A hardside and softside California waterbed mattress measures 72 inches wide by 84 inches long and matches the dimensions of a hardside king waterbed mattress. The mattress depth can vary even within the same manufacturer.

What size mattress fits in a king waterbed?

A regular king-size mattress will usually fit a king-size waterbed frame; likewise for a queen-size mattress. A California king is a special size many stores do not carry; it will have to be ordered. Buy an all-in-one mattress.

What is the average width of a king size bed?

King-size mattresses are 80 inches long and 76 inches wide. A king bed gives you plenty of room to sleep with a partner. In comparison to a queen mattress, a king bed has 8 inches more width per person.