The most popular 2-quart casserole plates have interior measurements of either square dishes that are 8 inches wide by 8 inches long by 2 inches deep, or rounds that measure 9 inches in diameter and 2 inches deep. Depending on the size of the rim and any handles, if any, an inch or more is added for the outside dimensions.
Other casserole shapes can be used in place of a 2-quart casserole by altering the cooking time and temperature. Two quarts can also fit in a loaf pan measuring 9 inches by 5 inches by 3 inches and an 11 by 7 inches by 1.5 inches baking pan.
The filling is shallower due to the baking pan, necessitating a reduction in baking time and a modest rise in oven temperature. Since the filling is deeper in the loaf pan, both the baking time and temperature must be increased.