Holiday Roast Calculator
For a whole turkey, plan on about 1.25 lb per guest, roast at 325°F for around 13 minutes per pound, and rest it for 30 minutes before carving.
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For 12 servings, plan on a 15 lb whole turkey: thaw 4 days in the fridge, roast for about 3 hr 15 min, then rest 30 min before carving.