I will highly recommend that the most common casserole dish size is the 3-quartz casserole dish which in most cases has a dimension of 9 X 13 “inches. The 3-quartz casserole best dish size is the standard casserole size used by various lovers of casserole recipes; it can also be used interchangeably with a 3 quartz Dutch oven. The 3 Quart casserole dish size is Lightweight, affordable, and perfect for home use.