How Long to Cook a Turkey: Per Kg, Pound & Size Guide

The moment you pull a dry turkey from the oven is the kind of kitchen disaster that haunts hosts for years. Getting the timing right means the difference between golden meat that pulls apart in tender shreds and a leathery disappointment nobody wants to face on Christmas Day. The good news is that celebrity chefs Jamie Oliver and Mary Berry have laid out straightforward formulas that take the guesswork out of the equation — you just need to know whether you’re working with a higher-welfare bird or a standard supermarket turkey.

Standard time per pound: 20 minutes ·
Per kg (higher-welfare): 25-30 minutes ·
Per kg (standard): 35-40 minutes ·
8–12 lb unstuffed: 2.75–3 hours

The following benchmarks summarise the key safety and timing targets across major UK recipe sources:

How long do you cook a turkey per kg?

The core formula depends entirely on the bird’s quality tier. Jamie Oliver draws a sharp line between higher-welfare turkeys — which carry more intramuscular fat — and standard supermarket birds, and that fat content is what determines your cooking time.

For a higher-welfare bird, budget 25 to 30 minutes per kilogram at 180°C. For a standard turkey, plan for 35 to 40 minutes per kilogram at the same temperature. A 7kg higher-welfare bird comes in at just over 3 hours, while a standard 7kg bird needs 4 to 4.5 hours, according to Jamie Oliver’s cooking guide.

Per pound equivalents

If you’re working with imperial measurements, the conversion is straightforward: 1 kg equals roughly 2.2 lb. That means 25–30 min/kg translates to approximately 11–14 minutes per pound, while 35–40 min/kg works out to 16–18 minutes per pound. UK sources tend to work primarily in kilograms, so converting back gives you a useful cross-check.

Factors affecting time

The reason higher-welfare birds cook faster is scientific rather than mysterious. Jamie Oliver notes that the extra intramuscular fat acts as an internal basting agent, conducting heat more efficiently through the meat. A leaner standard bird lacks that advantage, so the center takes longer to reach safe temperatures.

Oven calibration also plays a role. Bramble Farm notes that every oven runs differently, and they recommend using a meat thermometer as the ultimate authority rather than relying on timing formulas alone.

Is 3 hours long enough for a turkey?

For smaller birds, yes — but for anything over 5 kg, plan for longer. Jamie Oliver’s own timing table shows the range: a 4–5 kg turkey needs 2¼ to 2½ hours, a 5–6 kg bird takes 2½ to 3 hours, and a 6–7 kg turkey requires 3 to 3½ hours, per his tips and timings page.

By weight examples

An 8–12 lb unstuffed turkey — roughly 3.6–5.4 kg — fits comfortably in the 2.75–3 hour window. A 5 kg bird at the standard rate of 35–40 min/kg needs 3–3.5 hours. Mary Berry’s crown recommendation sits at 1.5–2 hours at 180°C fan, but that’s for a crown (breast meat only), not a full bird with legs and thighs, according to her YouTube guide.

Safe minimum times

The timing formula is your starting point, but internal temperature is your safety net. A good-quality dry-plucked bird reaches safe eating at 65°C, which will carry up to 75°C during resting. A standard supermarket bird needs 70°C at its deepest point before it’s considered safe, per Jamie Oliver’s safety guidelines.

The implication: a thermometer isn’t a backup plan — it’s the primary tool. Timing formulas tell you when to start checking. The probe tells you when to stop cooking.

Should you cover a turkey with foil?

Yes, for most of the cooking time — with a specific window at the end for browning. Jamie Oliver recommends covering the bird loosely with foil to prevent the breast from drying out while the darker leg meat catches up to temperature, then removing the foil about 1 hour before the estimated end time to allow the skin to crisp and colour.

When to cover

Start covered. The foil acts as a moisture seal, trapping steam that keeps the white meat from tightening up before the dark meat is cooked through. This is standard advice across Jamie Oliver’s turkey recipes and aligns with general food safety reasoning: uneven cooking is the enemy of a juicy bird.

Foil tenting method

Loose tenting beats tight wrapping. You want the foil to reflect heat without creating a steam cocoon that overcooks the breast. The goal is gentle, even heat distribution — not pressure-cooking the bird. If your oven runs hot, a loose foil tent becomes even more critical to avoid overcooking the top surface while the interior catches up.

What is the secret to a moist turkey?

Three things work together: brining before cooking, maintaining correct oven temperature, and building in a proper resting period afterward. No amount of basting can rescue an overcooked bird, and no resting time can compensate for a dry bird that went into the oven without enough moisture retained.

Brining tips

Brining works by osmosis — the salt solution carries moisture into the muscle tissue and helps the proteins hold onto it during cooking. For a higher-welfare bird, which already has more fat to work with, brining is beneficial but less critical. For a standard supermarket turkey, which tends to be leaner, brining is arguably essential to achieving a moist result.

Basting techniques

Mary Berry emphasizes basting her turkey crown throughout cooking, spooning the pan juices over the bird every 30–40 minutes. This is especially effective when the bird is uncovered in the final hour. The repeated application of fat and juices from the pan builds flavour and prevents the surface from drying out before the interior reaches temperature.

The catch: every time you open the oven door to baste, you lose 10–15 minutes of oven heat. Balance frequency against thermal loss — 3 or 4 bastings during the total cook is sufficient for most birds.

What are some common mistakes when cooking turkey?

Most turkey failures trace back to a handful of predictable errors that are easy to avoid once you know what to look for.

Stuffing errors

Stuffing the cavity adds cooking time and creates a food safety risk if the internal temperature doesn’t reach 70°C throughout the stuffing, not just at the breast. The safest approach for home cooks is to cook the stuffing separately — it browns better, reaches safe temperature more reliably, and frees up oven space. If you do stuff the bird, use a probe thermometer and plan for an extra 30–45 minutes.

Overcooking signs

The most reliable sign is clear, colourless juice running from the thigh joint — but by the time you’re seeing that, you’ve already overcooked if you were relying on timing alone. The juice test is a backup check, not a primary method. A meat thermometer inserted into the thickest part of the thigh (without touching bone) gives you a definitive answer. If the reading is at or above 74°C, the bird is done regardless of what the clock says.

The implication: treat timing charts as planning tools, not as the finish line. The thermometer is the only source of truth.

Step-by-step cooking guide

Here’s the practical sequence, from taking the bird out of the fridge to carving.

1. Take the turkey out 1 hour before cooking. Bringing the bird to room temperature before it hits the oven means more even cooking throughout. This is Jamie Oliver’s consistent advice across his turkey recipes.
2. Preheat the oven to 180°C / 350°F / gas 4 for at least 20 minutes. A fully preheated oven prevents cold spots that cause uneven browning.
3. Calculate base time: higher-welfare birds need 25–30 min/kg; standard birds need 35–40 min/kg. Add 10% as a buffer for carryover cooking and oven variability.
4. Cover loosely with foil and place in the oven. Breast-side down initially for a full bird helps the leg meat start from the bottom heat source.
5. Baste 3–4 times during cooking. Every 40–45 minutes, pull the rack out, spoon pan juices over the bird, and return it promptly.
6. Remove foil 1 hour before the end. This is the critical step for skin colour. No foil means the surface dries slightly and browns rather than steams.
7. Check temperature with a probe thermometer. Insert into the thickest part of the thigh away from bone. Target 65°C for quality birds, 70°C for standard supermarket turkeys.
8. Rest before carving. Full turkeys need 1–2 hours wrapped loosely in foil. Crowns need 30 minutes. Resting is not optional — the internal temperature continues to rise during rest, and the fibres relax, releasing juices that would otherwise pour out on the cutting board.

For UK home cooks, the path to a reliable roast turkey comes down to one decision before anything else hits the counter: what kind of bird are you buying? The formula changes meaningfully between a higher-welfare turkey and a standard supermarket bird, and that distinction carries through to internal temperature targets, resting times, and even basting strategy. Jamie Oliver’s per-kilogram guidelines (25–30 min/kg for higher-welfare, 35–40 min/kg for standard at 180°C) give you a solid planning baseline, but the meat thermometer remains non-negotiable for anyone serious about getting it right the first time.