Food & Cooking⏱ 5 min read

How Long to Cook a Turkey? A Weight and Temperature Guide

Turkey cooking times are the most Googled food question every November. Here's the definitive guide: roasting times by weight, safe internal temperatures, and how to keep it from drying out.

Undercooked turkey is a food safety risk. Overcooked turkey is a dry, flavourless disappointment. Getting this right requires knowing the correct cooking time and, more importantly, the correct internal temperature.

The Golden Rule: Temperature Over Time

Cooking times are guides; temperature is the truth. The only reliable way to know your turkey is cooked safely is a meat thermometer inserted into the thickest part of the thigh without touching bone.

Safe internal temperature: 74°C (165°F) Check in the thigh, breast, and stuffing (if using) All three must reach 74°C

Roasting Times by Weight (Unstuffed)

Turkey Weight180°C / 350°F (fan 160°C)Resting Time
3–4 kg (6–8 lb)1 hr 30 min – 1 hr 45 min30 minutes
4–5 kg (9–11 lb)1 hr 45 min – 2 hr 15 min30 minutes
5–6 kg (11–13 lb)2 hr 15 min – 2 hr 30 min45 minutes
6–7 kg (13–15 lb)2 hr 30 min – 3 hours45 minutes
7–8 kg (15–18 lb)3 hours – 3 hr 30 min60 minutes
8–9 kg (18–20 lb)3 hr 30 min – 4 hours60 minutes

Stuffed turkey: Add 30–45 minutes to the above times. The stuffing also needs to reach 74°C.

The Simple Time Formula

Unstuffed: 40 minutes per kg at 180°C + 20 minutes Stuffed: 45 minutes per kg at 180°C + 20 minutes Example: 5kg unstuffed turkey = (40 × 5) + 20 = 220 minutes = 3 hours 40 minutes

Crown vs Whole Bird

A turkey crown (breast only, no legs or wings) cooks significantly faster than a whole bird of the same weight because the dense leg meat is the slowest part to reach temperature.

Crown WeightCooking Time (180°C)Internal Temp Target
1.5–2kg1 hr 15 min – 1 hr 30 min74°C in thickest part
2–2.5kg1 hr 30 min – 1 hr 45 min74°C in thickest part
2.5–3kg1 hr 45 min – 2 hours74°C in thickest part

How to Stop Turkey Drying Out

Brine it. A wet brine (salt dissolved in water, submerge the turkey overnight) or dry brine (rub salt all over and refrigerate uncovered overnight) significantly improves moisture retention. The salt changes the protein structure of the muscle fibres, reducing moisture loss during cooking by 15–20%.

Don't overcook the breast. The breast dries out faster than the thigh. Some cooks start the bird breast-down for the first hour, then flip. Others shield the breast with foil for the last 45 minutes.

Rest properly. Resting is non-negotiable. Juices redistribute as the turkey rests — cutting into it immediately after the oven means those juices run out onto the board. Cover loosely with foil and a clean towel, and rest for the times shown in the table above.

Let the thermometer be your guide. Remove from the oven at 71–72°C — it will reach 74°C+ during the rest period (carryover cooking).

Defrosting First

A frozen turkey must be fully defrosted before cooking. In the fridge (the only safe method):

Defrost time = approximately 10–12 hours per kg A 5kg turkey: 50–60 hours = 2.5 days in the fridge

Plan ahead — this is the step most people forget until Christmas Eve.

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