A Complete Guide to Choosing the Right Turkey Size for 8 People
Posted by Copas Farm Shop on 29th Jul 2026
For 8 people, you need a turkey weighing between 5kg and 6kg (11–13lb). That gives roughly 650–750g of whole bird per person, which accounts for bone weight, shrinkage during cooking, and a sensible amount of leftovers. If you want generous second helpings or plan to use the carcass for stock and sandwiches the next day, aim closer to 6kg.
Key takeaways
- A turkey of 5kg–6kg feeds 8 people comfortably, with enough for modest leftovers.
- The standard UK rule is 650–750g of whole bird per person when buying a bone-in turkey.
- A 6kg free-range turkey from Copas Farm Shop typically serves 8 people with leftovers, based on birds sold over multiple Christmas seasons.
- Dry-aged, slow-grown birds tend to have denser, less watery flesh, meaning less shrinkage in the oven — you often get more edible meat per kilogram than a supermarket bird.
- Order early: Copas free range turkeys sell out most years, with peak stock reserved for customers who pre-order before October.
- A whole bone-in turkey at this size is almost always better value per serving than a crown or boneless joint when feeding 8 or more.
How much turkey do you need per person?
The reliable starting point is 650–750g of whole, bone-in turkey per person. For 8 people, that puts you between 5.2kg and 6kg. Round up to the nearest half-kilogram that fits your oven.
Bone accounts for roughly 30–35% of the bird's total weight, so a 5.5kg turkey yields approximately 3.5kg of cooked meat — around 430g per person before seconds. That's generous without being wasteful.
If your 8 guests include children or light eaters, a 5kg bird is sufficient. If you're feeding 8 adults with healthy appetites, or you want cold turkey for Boxing Day, choose a 6kg bird.
Does the breed or farming method change how much meat you get?
Yes, meaningfully. A slow-grown, free-range bird has a higher meat-to-water ratio than an intensively reared one. Mass-produced turkeys are often processed quickly and retain water, which cooks off in the oven. That is why a 5kg supermarket bird can feel noticeably smaller on the plate than a 5kg slow-grown bird.
At Copas Farm Shop, birds are raised on open pasture and dry-aged after slaughter. Dry-ageing removes surface moisture, which concentrates flavour and reduces in-oven shrinkage. In practice, a 5.5kg Copas turkey will often serve 8 people as well as a 6–6.5kg supermarket equivalent.
This is not a marketing claim — it's a question of biology and process. Slower growth produces firmer, denser muscle. Less water retention means more usable meat per kilogram on the carving board.
Whole turkey vs turkey crown vs boneless joint: which should you choose for 8 people?
For 8 people, a whole bone-in turkey is the most practical choice. It's better value per kilogram, easier to keep moist during cooking because the bones conduct heat gently through the meat, and it produces a carcass for stock — which stretches one bird across two or three meals.
| Option | Best for | Approx. weight for 8 | Limitation |
|---|---|---|---|
| Whole bone-in turkey | Groups of 6–10, leftovers, stock | 5kg–6kg | Requires a large oven; longer cooking time |
| Turkey crown (bone-in breast) | Smaller ovens; no dark meat | 2.5kg–3kg | No carcass for stock; dries out more easily |
| Boneless turkey breast joint | Maximum ease; carving speed | 2kg–2.5kg | Least forgiving in the oven; no leftovers |
| Two smaller birds | Oven flexibility; cooking speed | 2 × 3kg | More complex to time; higher cost per kg |
A turkey crown at 2.5–3kg will feed 8 people, but only just, and you lose the legs and wings that many guests prefer. A boneless joint requires precise temperature management to avoid dryness. Unless oven space is genuinely limited, a whole 5–6kg bird is the clearer choice.
How do I know if my oven is large enough for a 6kg turkey?
A 6kg turkey fits in most standard UK fan ovens with at least 70 litres of capacity, which covers the majority of domestic ovens sold since 2010. The bird needs roughly 5–7cm of clearance above the breast when seated in a roasting tin.
Check this before you order. Measure the internal height from the oven shelf to the top element, then sit your largest roasting tin in the oven and measure the remaining space. A 6kg Copas turkey is typically around 45–50cm long and 30cm across at its widest point.
If your oven is on the smaller side, a 5kg bird or a crown is the more sensible route — a bird that's too cramped will steam rather than roast, and the skin won't colour properly.
How to calculate the right turkey size: step by step
- Count your guests. Include children as half portions — two children equal one adult for the purposes of this calculation.
- Apply the weight formula. Multiply the number of adult portions by 700g. For 8 adults: 8 × 700g = 5.6kg.
- Decide on leftovers. If you want enough for sandwiches and cold cuts the next day, add 500g–1kg to your target weight.
- Check your oven dimensions. Measure internal height and width before confirming a bird size above 6kg.
- Choose your bird type. Whole bone-in for most households; crown if oven space is limited; boneless joint only if ease of carving is the priority.
- Order early. Premium free-range turkeys at this weight sell out. Place your order before October for Christmas, or at least 2–3 weeks ahead for any other occasion.
- Confirm your collection or delivery date. A fresh bird should arrive no more than 4–5 days before you plan to cook it. Keep it in the coldest part of your fridge, unwrapped, to allow air circulation.
What are the most common mistakes when buying a turkey for 8 people?
Buying too large. A 7–8kg bird for 8 people sounds impressive but creates real problems: longer cooking time, uneven heat distribution, and a freezer full of meat nobody wants by 28th December. Bigger is not better. The best outcome is a bird that's right for your table, not the largest one available.
Ordering too late. Free-range turkeys from independent farms are produced in fixed numbers. Copas has seen birds at the 5–6kg weight range sell out consistently before December in recent years. Waiting until late November is a risk that's easily avoided.
Ignoring resting time. A 6kg turkey needs 30–45 minutes of resting after it comes out of the oven. Plan this into your timings. The meat continues to cook, juices redistribute, and the bird becomes significantly easier to carve.
Cooking straight from the fridge. A cold bird takes longer to cook evenly. Take your turkey out of the fridge 1–2 hours before it goes in the oven to allow it to come to room temperature.
Skipping the oven check. It sounds obvious, but measuring your oven before ordering a whole turkey saves genuine stress on Christmas morning. A bird that doesn't fit can't be returned.
How long does a 5–6kg turkey take to cook?
A 5–6kg turkey at 180°C (fan) takes approximately 2.5 to 3.5 hours. Use the following as a working guide, then verify with a meat thermometer — the internal temperature at the thickest part of the thigh should reach 75°C.
| Bird weight | Approx. cooking time at 180°C (fan) |
|---|---|
| 5kg | 2 hours 30 minutes – 3 hours |
| 5.5kg | 2 hours 45 minutes – 3 hours 15 minutes |
| 6kg | 3 hours – 3 hours 30 minutes |
These timings assume the bird starts at room temperature, not straight from the fridge. Add 20–30 minutes if cooking from cold. Always rest the bird for at least 30 minutes under loose foil before carving — this step is not optional if you want the breast to stay moist.
Should I order a fresh or frozen turkey for 8 people?
Fresh is the better choice wherever possible. A fresh, properly chilled turkey retains moisture and texture more reliably than one that has been frozen and thawed. The cell structure of the meat remains intact, which matters for both flavour and carving.
If you do choose frozen, allow 24 hours of defrosting time per 2.5kg of bird in a cold fridge. A 6kg frozen turkey needs at least 48–60 hours to thaw fully. Don't rush this with warm water or a warm room — uneven thawing affects both safety and quality.
Copas Farm Shop supplies fresh turkeys for collection and delivery, scheduled to arrive in the days before your cook date. For Christmas, delivery slots are typically available from 22nd–24th December, with collection from the farm also available.
Frequently Asked Questions
What size turkey do I need for 8 adults? For 8 adults, a turkey between 5kg and 6kg is the right range. Using the standard UK guide of 650–750g of whole bird per person, 8 adults require approximately 5.2–6kg. Choose 6kg if you want leftovers or have guests with larger appetites.
Is a 5kg turkey enough for 8 people? A 5kg turkey will feed 8 people, but with limited leftovers. It yields roughly 3.2kg of cooked meat — around 400g per person. If your guests are light eaters or you have a few children at the table, a 5kg bird is entirely sufficient.
Is it better to buy a whole turkey or a crown for 8 people? For 8 people, a whole turkey is generally the better choice. It offers more variety of meat (breast, leg, and wing), produces a carcass for stock, and tends to stay moister during cooking because the bones help distribute heat. A crown is a practical option only if oven space is limited.
How far in advance should I order a turkey for 8 people? For Christmas, order before October. For other occasions, place your order at least 2–3 weeks ahead. Free-range turkeys from independent farms are produced in fixed quantities and the most popular sizes — 5–6kg — tend to sell out before December.
What is the difference between a supermarket turkey and a free-range farm turkey at the same weight? The primary differences are farming method, growing time, and processing. Supermarket turkeys are typically reared intensively in shorter timeframes and retain more water, which cooks off in the oven. A slow-grown, pasture-raised bird like those from Copas has denser, less watery flesh and is dry-aged to concentrate flavour, so you'll often get more usable meat per kilogram.
Can I cook a 6kg turkey in a standard UK oven? Yes, in most cases. The majority of domestic fan ovens sold in the UK since 2010 have a capacity of 70 litres or more, which accommodates a 6kg bird. Measure your oven's internal height with your roasting tin in place before ordering, allowing 5–7cm of clearance above the breast.
How do I keep a turkey moist when cooking for 8 people? Bring the bird to room temperature before cooking (allow 1–2 hours out of the fridge), cover the breast with butter or a layer of streaky bacon for the first two thirds of cooking, then uncover to colour the skin. Rest for at least 30–45 minutes under loose foil after removing from the oven. On a high-quality dry-aged bird, this is enough — no brining required.
What should I do with leftover turkey after feeding 8 people? A 6kg turkey will yield meaningful leftovers for a table of 8. Cold turkey keeps in the fridge for up to 3 days. Strip the carcass within 24 hours and use it for stock or soup. Leftover meat works well in sandwiches, pies, and salads. Freeze portioned leftovers if you won't use them within 3 days — they keep well for up to 3 months.