Turkey Thawing and Cooking Time Calculator

How to use this tool

Choose what to calculate. The schedule mode counts back from the moment you carve: enter the weight, thaw method, stuffing, and the day and clock time, and it returns when to start thawing, when the turkey goes in and comes out, and the rest. The guidance box switches both the thaw rule and the roasting chart between USDA at 325 °F (163 °C) and Turkey Farmers of Canada at 350 °F (177 °C). They disagree, so the tool shows both.

The input people most often get wrong is the unit: a 7 kg bird is 15.4 lb, and switching the unit box converts your number. The serve time means carving, so the oven comes out the rest time earlier. This tool gives general food safety information from USDA and Health Canada, and the thermometer reading, not the clock, decides when a turkey is done.

What the calculation is doing

USDA gives thaw times by weight band, from 1 to 3 days in the refrigerator for 4 to 12 lb up to 5 to 6 days for 20 to 24 lb. Every band edge is the weight divided by four, in days, so the plan uses 24 hours per 4 lb, the slow end of USDA's rule of 24 hours for each 4 to 5 lb, and 30 minutes per pound in cold water. Turkey Farmers of Canada says 5 hours and 1 hour per pound.

Roasting is a table lookup. USDA at 325 °F gives a range per band, 3 hours 45 minutes to 4 hours 15 minutes for an unstuffed 14 to 18 lb turkey. The plan uses the longer end, so an early bird simply rests longer. A weight on a band edge takes the lower band, and a gap in the Canadian chart takes the next row up. From frozen, both ends are multiplied by 1.5, since USDA says at least 50 percent longer.

Beyond the tables (8 to 24 lb for roasting, 4 to 24 lb for thawing) the tool extends them and labels the result an estimate. Roast ranges shift by the table's average rate, the longest time at 24 lb minus the shortest at 8 lb, over 16 lb: 8.4 minutes per pound for USDA, and 15 unstuffed and 20 stuffed for the Canadian chart. It accepts 4 to 50 lb.

The schedule counts minutes in a repeating week of 10,080 that starts at Sunday midnight, so no time zone or clock change enters it. The worked example below shows every step.

Why the outside thaws first, and why the thermometer beats the timetable

Bacteria grow most rapidly between 40 °F and 140 °F (4 °C and 60 °C), doubling in as little as 20 minutes, says USDA. Heat travels in from the surface, so on a counter the outside passes 40 °F while the centre is still frozen, and USDA says poultry left out for more than 2 hours is not at a safe temperature. The refrigerator keeps the surface cold while the core catches up, over days. Cold water is faster, but the surface warms, so the water is changed every 30 minutes to keep it cold.

The sources differ: cold water is 30 minutes per pound for USDA and an hour for Turkey Farmers of Canada, whose 10 hours per kilogram in the refrigerator is roughly 10 percent under its own 5 hours per pound, so the tool uses the pound figure.

Stuffing is heated only by the bird, so its centre can be the last place to reach 165 °F (74 °C). USDA says to cook it separately for safety and even doneness. If you stuff, do it loosely and just before roasting, with three quarters of a cup per pound (USDA) or half a cup (Turkey Farmers of Canada).

The timetable is a forecast and the thermometer is the measurement: ranges are 30 minutes wide, ovens run hot or cold, and each opening of the door loses heat. The safe temperature is not settled either, as the table shows, and the tool does not choose for you. The higher Canadian figure buys margin and usually a drier breast.

Thaw and roast times by weight

These tables come from the engine behind the tool. USDA prints roasting times as fractions of an hour, such as 2¾ to 3 hours; here they are hours and minutes, so 2:45 to 3:00. First the USDA thaw table, with kilograms added. In the refrigerator the Canadian rule lands within a day of it at every weight, while in cold water it takes twice as long.

USDA roasting times for a thawed turkey at 325 °F.

The Turkey Farmers of Canada chart for a conventional oven at 350 °F (177 °C). Its convection chart at 300 °F (149 °C) has only two rows, so the tool leaves it out.

A worked example you can check on paper

The default: 16 lb unstuffed, refrigerator, USDA, carved Sunday at 5:30 pm, 30 minute rest. Thaw: 16 × 6 hours = 96 hours = 4 days. Roast: 14 to 18 lb unstuffed is 3 hours 45 minutes to 4 hours 15 minutes, so plan 255 minutes. Carving is 0 × 1,440 + 1,050 = 1,050. Out = 1,050 − 30 = 1,020 (5:00 pm). In = 1,020 − 255 = 765 (12:45 pm). Start = 765 − 5,760 = −4,995, plus 10,080 is 5,085 = 3 × 1,440 + 765, Wednesday at 12:45 pm.

Mistakes that catch people out

Thawing on the counter. Frozen poultry left out for more than 2 hours is not at a safe temperature, and the outside warms long before the middle thaws. Use the refrigerator, cold water or the microwave.

Entering kilograms as pounds. A 7 kg turkey entered as 7 lb gets a thaw of 42 h instead of 3 days 20 h 40 min, and a roast 1 h 20 min short. Set the unit first.

Stuffing early or packing it tight. Stuff loosely, just before cooking, and put the bird straight into the oven. Cooking the stuffing separately avoids the problem.

Trusting the clock over the thermometer. Every figure is a range and the sources differ by more than half an hour. Check the thigh, wing and breast.

Letting a cold water turkey wait. A refrigerator thaw can sit for a day or two; a cold water thaw goes in the oven at once. If dinner might slip, use the refrigerator and add spare hours.

Popular calculations

Each opens the calculator with those figures filled in, and they can be changed once it is open.

Thaw time in the refrigerator

Thaw time in cold water

Roasting time, unstuffed, USDA at 325 °F

Roasting time, stuffed, USDA at 325 °F

Kilogram examples with the Canadian rule

Full schedules for Thanksgiving dinners

How this was checked

The USDA roasting timetable was reproduced for stuffed and unstuffed turkeys at four weights in every band (120 comparisons), and the USDA thaw tables and the Canadian chart at every listed weight. A schedule round trip compared the tool with independent UTC date arithmetic over 20,000 random inputs, 7,155 of them wrapping past the start of the week; every start time matched. Pounds to kilograms and back over 10,000 pairs erred by at most 1.4 × 10⁻¹⁴ lb, and times rose with weight through 10,590 checks.

Sources: USDA Food Safety and Inspection Service; Health Canada; Turkey Farmers of Canada; NIST for the pound; Cornell Law School and The Canadian Encyclopedia for the holiday dates. One state university copy of the USDA table prints 4¼ hours for the low end of the 20 to 24 lb stuffed row where USDA says 4¾; the tool follows USDA. Every address above was opened and checked for a distinct title and the right answer.

Common questions

How long does it take to thaw a turkey in the refrigerator?

USDA allows about 24 hours for each 4 to 5 lb in a refrigerator at 40 °F (4 °C) or below, so its table gives 3 to 4 days for 16 lb and the tool plans 4 days. Turkey Farmers of Canada says 5 hours per pound, which is 3 days 8 hours for the same bird. Plan for the longer figure.

Can you cook a turkey from frozen?

Yes. USDA says it is safe to cook a turkey from the frozen state and that it takes at least 50 percent longer than a thawed one. The tool multiplies both ends of the range by 1.5 and calls the result a minimum: an unstuffed 14 lb bird goes from 3 hours 45 minutes at the longer end to about 5 hours 40 minutes. A frozen bird cannot be stuffed.

What temperature should a cooked turkey reach?

It depends on whose guidance you follow. USDA says 165 °F (74 °C) in the innermost part of the thigh and wing, the thickest part of the breast and the centre of any stuffing. Health Canada says 82 °C (180 °F) for a whole bird. Turkey Farmers of Canada says 170 °F (77 °C) unstuffed and 180 °F (82 °C) stuffed. The tool shows all three and does not pick one.

How long should a turkey rest before carving?

USDA says to let it stand 20 minutes before carving so the juices set, and Turkey Farmers of Canada agrees. The tool defaults to 30 minutes because carving rarely runs to plan.

When should I start thawing for Thanksgiving?

Canadian Thanksgiving is the second Monday of October and US Thanksgiving is the fourth Thursday of November. A 16 lb unstuffed turkey carved at 6 pm on the Thursday goes in the oven at 1:15 pm by the USDA table and starts thawing Sunday 1:15 pm. Carved at 6 pm on the Monday by the Canadian rule, it goes in at 1:30 pm and starts thawing Friday 5:30 am, or Thursday 5:30 am with 24 spare hours.

How long can a thawed turkey wait before cooking?

USDA says a turkey thawed in the refrigerator can stay there 1 or 2 days before cooking, and Turkey Farmers of Canada says to cook within 48 hours. A turkey thawed in cold water is cooked immediately, so the tool ends that thaw as the bird goes into the oven.

Related Calculators and Reference

• Time Calculator: add and subtract hours and minutes to check the roast and rest arithmetic.
• Days From Today Calculator: find the calendar date a set number of days before dinner.
• Convert Kg to Lbs: turn a kilogram label into pounds before comparing charts.
• Temperature Converter: switch an oven or thermometer reading between Celsius and Fahrenheit.
• Sleep Calculator: the same idea of counting back from a fixed time, applied to a wake up.
• USDA FSIS, Let's Talk Turkey: the roasting timetable, thermometer placement and stuffing advice behind the USDA figures.