Turkey Math: How Big a Bird, Thawing Days, and Roasting Time
October 29, 2026
The standard rule for a whole bird is 1 pound per person, which allows for bones, and 1.5 pounds per person if you want generous servings and leftovers. For 12 guests, that is 12 pounds without leftovers and 18 pounds with. For birds over 20 pounds, consider cooking two smaller birds, which cook faster and more evenly, and gives more drumsticks.
The biggest planning issue is thawing a frozen turkey, which takes days, not hours.
Skip the math and get your answer instantly:
Open the Time Calculator →Thawing Times
In the refrigerator (at 40°F or below): allow 24 hours for each 4 to 5 pounds. An 18-pound turkey needs 3.6 to 4.5 days, so start 4 to 5 days ahead. In cold water (changing the water every 30 minutes): allow 30 minutes per pound, so 18 pounds takes 9 hours. A bird thawed in cold water must be cooked immediately. Never thaw at room temperature. A turkey thawed in the refrigerator can be kept for another 1 to 2 days before cooking. In the microwave, follow the manufacturer's instructions, and cook promptly.
| Turkey weight | Refrigerator thaw | Cold-water thaw | Roasting at 325°F (unstuffed) |
|---|---|---|---|
| 8-12 lb | 2-3 days | 4-6 hours | 2¾-3 hours |
| 12-14 lb | 3-3.5 days | 6-7 hours | 3-3¾ hours |
| 14-18 lb | 3.5-4.5 days | 7-9 hours | 3¾-4¼ hours |
| 18-20 lb | 4.5-5 days | 9-10 hours | 4¼-4½ hours |
| 20-24 lb | 5-6 days | 10-12 hours | 4½-5 hours |
Roasting and Doneness
Roast at 325°F on a rack, breast up. Times are estimates, so always check the temperature: the thickest part of the breast and the innermost part of the thigh and wing should reach 165°F (74°C). Stuffing cooked in the bird must also reach 165°F, which tends to overcook the meat, so many cooks bake it separately. Rest the turkey for 20 to 30 minutes before carving; the temperature rises a few degrees. Tent with foil if the skin is browning too fast. A dry-brined bird (about 1% salt by weight) or a spatchcocked bird (backbone removed and flattened) cooks faster, in about 1.5 to 2 hours for a 14-pound turkey at 425°F.
Timeline Example
For dinner at 4:00 pm with a 16-pound turkey: thaw in the refrigerator starting 4 days before, remove from the refrigerator 30 to 60 minutes before roasting, roast for about 4 hours (starting at 11:00 am), allow 30 minutes of resting (3:30 pm), then carve. Plan for the oven space: the sides need the oven after the turkey comes out, so choose dishes that can be reheated or cooked on the stovetop.
Leftovers
Refrigerate leftovers within 2 hours, in shallow containers, and use them within 3 to 4 days, or freeze for up to 2 to 6 months. Reheat to 165°F. A 16-pound bird yields roughly 6 to 8 pounds of meat.
Frequently Asked Questions
How much turkey per person?
1 pound without leftovers, 1.5 pounds with.
How long to thaw a turkey in the refrigerator?
24 hours per 4 to 5 pounds.
How long to roast a 12 to 14 pound turkey?
About 3 to 3¾ hours at 325°F unstuffed.
What temperature is safe?
165°F in the thickest parts.
Can I thaw at room temperature?
No.