Buying a too-small mattress is one of the biggest mistakes new bed-buyers make. Couples who've been sleeping on a â€œdoubleâ€ (also known as a full-size mattress) since they got together may think they have enough room. Queen 60" x 80" .
Standard bed sizes are based on standard mattress sizes, which vary from country to country.. . Subtract 2.0 inches from California queen waterbed size. 58 in Ã— 82 in (147 cm Ã— 208 cm); California king waterbed insert: Used for conventional mattresses .