Here are the approximate standard sizes of mattresses currently manufactured in the U.S.

Standard Sizes                                                     Special Sizes

Twin Size:     39” X 75”                                           Twin Extra Long:                39” X 80”

Full Size:       54” X 75”                                           Full Extra Long:                  54” X 80”

Queen Size:  60” X 80”                                           California King:                   72” X 84”

King Size:      76” X 80”