Quick answer: Per person, plan 450–500 g raw whole turkey (or 225–250 g boneless), 200–250 g roast potatoes, 80 g of each of two or three vegetables, 100 g stuffing, 2–3 pigs in blankets and 125–150 ml gravy. That lands at roughly 700 g of cooked food on the plate.
That is the whole answer, and it is worth saying up front that it is far less contested than the internet makes it look.
The plate, component by component
| Component | Per person | Published by |
|---|---|---|
| Turkey, whole raw bird | 450–500 g | Aldi UK, Hart's Turkeys, Hatto & Son |
| Turkey, boneless or crown | 225–250 g | Hart's Turkeys, Hatto & Son |
| Roast potatoes, raw weight | 200–250 g | Safefood, Gousto |
| Each vegetable served | 80 g | Food Savvy, BDA |
| Stuffing | 100 g (2–3 balls) | Wychavon DC, Safefood |
| Gravy | 125–150 ml | Food Savvy, Gousto |
Add 2–4 pigs in blankets, and for dessert 100–125 g of Christmas pudding or one slice of pie. The British Dietetic Association's own worked Christmas dinner comes out at 710 g per portion, which is a useful sanity check: if your plate maths lands wildly above a kilo, you are cooking two dinners each.
The hidden variable — and it isn't what you've been told
The standard explanation for why Christmas portion advice varies is an incentive split: food-waste charities and public-health bodies tune numbers down because their job is less waste, while caterers, butchers and supermarkets tune them up because their downside risk is a host running short — and because they are selling you the surplus.
It is a tidy theory. We went and checked it against the published figures, source by source. It mostly does not hold, and on the single biggest item it points the wrong way.
| Component | Waste / health bodies | Sellers and consumer media |
|---|---|---|
| Roast potatoes | 250 g — Safefood | 170–227 g — LCBO, Gousto, Just A Pinch |
| Vegetables (total) | 160 g — Food Savvy (80 g × 2) | 85–113 g — LCBO, Food Network |
| Gravy | 125 ml — Wychavon DC | 80–150 ml — Food Network, Gousto |
| Stuffing | 100 g — Safefood | ¾ cup — Almanac, Food Network |
| Pigs in blankets | 2–3 — Food Savvy | 4 — Gousto |
On potatoes and vegetables, the waste charities are the generous ones. Safefood — an Irish state food-safety agency whose entire Christmas campaign is about buying less — publishes a bigger potato portion than the Ontario liquor board's hosting planner or a UK meal-kit company that would rather sell you more food.
Where the theory does hold, it holds narrowly and honestly. Gousto says four pigs in blankets where the council says two or three. Butchers uniformly add a leftovers allowance on top of their base figure — Aldi goes from 450 g to “between 500–600 g per guest” if you want leftovers. That is a real upward nudge, and it is also perfectly reasonable advice. It is not a 2–3× conspiracy.
So where does the “3× gap” come from? A unit error
Here is the comparison that produces the shock headline. The BDA's Christmas dinner sheet notes “approx. 150 g per person” against a 4.5 kg bird serving 6–8. American guidance says 1½ lb (680 g) per guest (Food Network, Food Fanatic, Just A Pinch). Four and a half times apart. Both are correct.
The BDA number is cooked meat on the plate. The American number is raw whole bird — bones, skin, wings, cavity and all. They are not the same object, and nothing on page one of either territory's search results says so.
450–500 g raw whole bird ≈ 225–250 g boneless ≈ 150–175 g served on the plate, plus leftovers
You do not have to take our word for the conversion, because the butchers publish both halves. Hart's Traditional Turkeys quotes “minimum of 500 gms per serving” for a whole bird and “minimum of 250 gms” for a boneless crown. Hatto & Son quotes 500 g whole and 200–250 g for a crown. Two independent trades, same 2:1 ratio — that is your whole-bird-to-edible-meat yield, roughly 50%, straight from the people who break the birds down. A US chef quoted by Food Network puts home-cook yield lower still, at “40 percent of a cooked bird.” Our full working is in how much turkey per person.
UK/Ireland vs US: a real difference, but a small one
Once you fix the units, one genuine territorial gap survives — and it is about 1.3×, not 3×.
| Figure | UK / Ireland | United States |
|---|---|---|
| Raw whole turkey per guest | 450–500 g (1–1.1 lb) | 680 g (1½ lb) |
| Boneless meat per guest | 250 g | 227 g (8 oz) |
| Starch per guest | 200–250 g potatoes | 170–227 g potatoes |
| Number of separate sides | 5–7 | 3–4 |
Notice the boneless line: 250 g against 227 g. Essentially identical. The two territories agree almost exactly on how much turkey a person eats and disagree only on how much bird you should buy to get there — the US figure builds in a bigger leftovers margin, which is a cultural preference, not a nutritional claim.
The side count matters more than any single number. A British or Irish Christmas plate carries roasties, sprouts, carrots, parsnips, stuffing, pigs in blankets and often braised cabbage. An American holiday plate typically runs mashed potato, stuffing, one or two vegetables and cranberry sauce. Each UK component is smaller because there are more of them. If you are cooking a UK-style spread, do not scale up US per-side figures — you will produce half again as much food as anyone eats.
By guest count
Using the recommended figures, with a modest leftovers allowance on the bird:
| Guests | Whole turkey | Potatoes / veg / gravy |
|---|---|---|
| 4 | 2.2–2.5 kg | 1 kg / 650 g / 600 ml |
| 6 | 3–3.5 kg | 1.5 kg / 1 kg / 900 ml |
| 8 | 4–4.5 kg | 2 kg / 1.3 kg / 1.2 L |
| 10 | 5–5.5 kg | 2.5 kg / 1.6 kg / 1.5 L |
| 12 | 6–6.5 kg | 3 kg / 1.9 kg / 1.8 L |
These sit inside Safefood's own published bird sizes (3–4 kg for 4–6 people, 5–6 kg for 8–10), which is reassuring. Veg is the total across two or three types at 80 g each.
Two adjustments worth making. Scale the bird down, not up, as numbers rise: a 6 kg turkey has a better meat-to-frame ratio than a 3 kg one, so 500 g a head over-buys at twelve guests. And if you are serving a second protein — a Christmas ham at 200–250 g or a rib of beef at 250–300 g — cut the turkey allowance by about a third rather than serving both at full portion.
Our recommendation, and why it isn't an average
Take the waste bodies' figures for everything on the plate and the butchers' figures for the bird. That is not splitting the difference; it is picking each source where it is actually authoritative. Safefood, Food Savvy and the BDA have measured what people eat and have no reason to flatter you. Butchers have measured what a carcass yields and no reason to get it wrong — an under-sold bird is a complaint, an over-sold one is a return.
Where you should deliberately over-cater is the two items that cost almost nothing and run out first: gravy (go to 150 ml, or read how much gravy per person for the drippings ceiling that caps it) and roast potatoes (250 g, and nobody has ever complained about surplus roasties). Under-cater the vegetables, which are the most-scraped item on any Christmas plate.
The sourcing caveat
This is an unusually well-sourced quantity question. Safefood is an Irish state agency, the British Dietetic Association is a professional body, and Food Savvy and the Wychavon guidance are local-authority waste programmes — none of them sell food. That is rare; our canapé guide had to admit every available source sold canapés. Set against them, four commercial or media sources broadly agree. Where we could not source something, we have said so: we found no published gram weight for a US “¾ cup of stuffing,” which is why that row above stays in cups.
For the drinks half of the day, see Christmas party drink quantities and how much mulled wine per person — the same publisher-incentive question comes up there, and the answer is different.