The thermometer is the answer. The clock is the plan.
Every roasting chart, including the one behind this calculator, is an estimate. Ovens run hot and cold, birds come out of the fridge at different temperatures, and a stuffed turkey behaves differently from an empty one. What settles the question is a thermometer.
The USDA safe minimum is 165F, measured in three places: the innermost part of the thigh, the innermost part of the wing, and the thickest part of the breast. If the bird is stuffed, the centre of the stuffing has to reach 165F too, which is the whole reason a stuffed turkey takes longer.
So use the time below to plan your day, and the thermometer to decide when to take it out.
Roasting times at 325F
| Weight | Unstuffed | Stuffed |
|---|---|---|
| 8 to 12 lb | 2¾ to 3 hrs | 3 to 3½ hrs |
| 12 to 14 lb | 3 to 3¾ hrs | 3½ to 4 hrs |
| 14 to 18 lb | 3¾ to 4¼ hrs | 4 to 4¼ hrs |
| 18 to 20 lb | 4¼ to 4½ hrs | 4¼ to 4¾ hrs |
| 20 to 24 lb | 4½ to 5 hrs | 4¾ to 5¼ hrs |
These are the USDA figures, and 325F is not arbitrary: it is the temperature those times were measured at. Turning the oven up browns the skin faster than the thigh cooks, which is how people end up with a beautiful bird that is underdone at the bone.
The number that actually ruins Thanksgiving
It is not the roasting time. Almost nobody gets that badly wrong, because the bird is in front of them and the oven is on.
It is the thawing. In the refrigerator, the USDA allows 24 hours for every 4 to 5 pounds, and that arithmetic surprises people every single year:
| Turkey | Days in the fridge | Buy it by |
|---|---|---|
| 12 lb | 2½ to 3 days | Monday |
| 16 lb | 3 to 4 days | Sunday |
| 20 lb | 4 to 5 days | Saturday |
| 24 lb | 5 to 6 days | Friday, the week before |
A twenty pound turkey bought on the Tuesday will still have ice in it on Thursday morning. That is not a failure of planning so much as a genuinely counterintuitive number: nothing else in a normal kitchen takes five days to get ready.
If it is still frozen and dinner is today
You have two safe options and one that is not.
Cold water thawing takes 30 minutes per pound, so a 16 pound bird is about 8 hours. Keep it in its wrapping, fully submerged, and change the water every 30 minutes. It has to be cooked immediately afterwards rather than going back in the fridge.
Cooking from frozen is genuinely allowed and works better than its reputation. The USDA says to allow at least 50 percent longer than the thawed time. You cannot stuff it, and you will need to fish the giblet bag out an hour or two in once it loosens, but the result is fine.
Thawing on the counter is the one to avoid. The outside reaches room temperature hours before the middle thaws, and that is the window bacteria are waiting for.
Working backwards from dinner
The schedule that matters runs in reverse. Pick the time you want to eat, subtract the rest, subtract the roast, and that is when the bird goes in. Then subtract the thaw, and that is when it comes out of the freezer.
Add the serving time above and this calculator lays that out for you. Two things worth building in: the 20 minute rest before carving, which lets the juices settle and frees the oven for everything else, and a little slack, because a turkey that finishes early can sit covered while a turkey that finishes late holds up the entire meal.
If you are also working out how much to buy, roughly one to one and a half pounds per person is the usual guide, and a good deal of that is bone. The meat quantity calculator handles the same question for a crowd, and the oven temperature converter is there if your recipe is in Celsius or gas marks.