You can use the 17x11 size or the 19x14 size. If you think this is the absolute largest turkey you are ever going to cook, then I'd go with the 17x11. If you think that you may want to cook a 25 pounder in the future then opt for the 19x14.
For roasting a 20-pound turkey, you should use a large roasting pan that is at least 16 inches in length and 13 inches in width.
A full sheet cake pan measures 16" x 24" x 3"
Well, My first question is why are you greasing a roasting pan ?
For roasting a 15-pound turkey, you should use a baking pan that is at least 16 inches in length and 13 inches in width.
To use a roasting pan effectively for cooking, preheat the oven to the desired temperature, place the roasting pan in the oven to heat up, season the meat or vegetables, place them in the hot roasting pan, and cook until done, basting occasionally for added flavor and moisture.
The best type of pan to use for roasting a Thanksgiving turkey is a heavy-duty roasting pan with a rack. This type of pan allows for even cooking and helps to prevent the turkey from sticking to the bottom of the pan.
For a 15-pound turkey, you should use a roasting pan that is at least 16 inches in length and 13 inches in width to ensure the turkey fits comfortably and cooks evenly.
An average small roasting pan is about 16.5" long, 12.5" wide, and 2.5" deep. This is an example from Amazon: http://www.amazon.com/KittAmor-80109-Small-Roasting-Pan/dp/B001F7ASYK
To make a roast duck dinner, you will need a roasting pan for the duck. You will also need a sauce pan to cook your sauces and vegetables in.
glass pan
The equipment typically used for roasting includes an oven, a roasting pan, and a meat thermometer.
For cooking a turkey, you should use a roasting pan that is large enough to comfortably fit the turkey with some space around it. A pan that is at least 2 inches larger than the turkey on all sides is recommended to allow for proper air circulation and even cooking.