Quick answer: Buy 1/2 pound (225 g) of bone-in ham per person, or 1/3 pound (150 g) of boneless ham per person. That is purchased weight, not cooked weight. For 10 guests that means a 5 lb (2.3 kg) bone-in half ham, or a 3.5 lb (1.6 kg) boneless one.
The single most important thing about ham quantities is that the per-person figure nearly doubles depending on whether there is a bone in it. Almost every page you'll find gives you one number and never says which kind of ham it's describing.
The US Department of Agriculture's Food Safety and Inspection Service publishes both figures in its Hams and Food Safety fact sheet, and they are the origin of essentially every ham number circulating online:
- Boneless ham: "1/4 – 1/3 lb. per serving"
- Bone-in ham: "1/3 – 1/2 lb. of meat per serving"
At the generous end of each range that is 1/2 lb against 1/4 lb — exactly twice as much ham to buy for the same plate of food. A host who reads "a third of a pound per person" on a grocery blog and buys an 8 lb (3.6 kg) ham for 20 people has either catered it comfortably or come up short by a third, and the deciding factor is a bone they never thought about.
The figures, by source
| Ham type | Per person, purchased weight | Source |
|---|---|---|
| Bone-in (incl. spiral-cut) | 1/3–1/2 lb (150–225 g) | USDA FSIS |
| Boneless | 1/4–1/3 lb (115–150 g) | USDA FSIS |
| Bone-in | 2–3 servings per lb | UGA Extension |
| Boneless | 4–5 servings per lb | UGA Extension |
| Boneless gammon (UK) | 200 g (7 oz) | Which? |
Two of those rows disagree and it's worth saying so rather than splitting the difference. The University of Georgia Extension's "4 to 5 servings per pound" for boneless works out at 1/5 – 1/4 lb per person — thinner than the USDA's floor. The UK consumer group Which?, at 200 g of boneless gammon per person, is asking you to buy nearly double what UGA does for the same cut. That is a real transatlantic difference in what counts as a portion of pork, not a rounding error, and averaging the two would produce a number no source stands behind.
Why the bone costs you so much
Bone alone doesn't explain a 2× swing. Industry cutting data published by the Pork Information Gateway puts the bone in a raw ham at roughly 4.7–5.2 lb out of a 54 lb rough ham — under 10% by weight. So where does the rest of the gap come from?
Two places. First, carving loss: the meat immediately against and between the bones is awkward to remove cleanly at the table, and a good deal of it stays there. Second — and this is the part nobody mentions — boneless ham is a manufactured product. It has been trimmed, formed and pumped with curing solution, and that solution is weight you paid for and will serve.
The USDA's own labelling rules make this measurable. FSIS defines four tiers by protein content:
- "Ham" — at least 20.5% protein in the lean portion; essentially no added water.
- "Ham with natural juices" — at least 18.5% protein.
- "Ham — water added" — at least 17.0% protein, with 10% added solution.
- "Ham and water product" — below 17.0% protein, and the label must state the percentage of added ingredients.
Read the front of the pack before you weigh anything. A ham labelled "ham and water product" can legally be a meaningful fraction of brine, and that fraction cooks out. If you're buying at the bottom tier, plan closer to the top of whichever range applies.
What size ham to buy
Planning figures below use the top of the USDA range for each type, which is the right call for a holiday main course where people take seconds and you want leftovers. If ham is one of two meats on the table, drop to the bottom of the range instead.
| Guests | Bone-in ham | Boneless ham |
|---|---|---|
| 6 | 3 lb (1.4 kg) | 2 lb (0.9 kg) |
| 10 | 5 lb (2.3 kg) | 3.5 lb (1.6 kg) |
| 12 | 6 lb (2.7 kg) | 4 lb (1.8 kg) |
| 20 | 10 lb (4.5 kg) | 7 lb (3.2 kg) |
| 30 | 15 lb (6.8 kg) | 10 lb (4.5 kg) |
Those numbers map onto things you can actually pick up. The USDA cooking chart lists retail weights by cut: a bone-in half ham runs 5–7 lb, a whole bone-in ham 10–14 lb, a spiral-cut ham 7–9 lb, and boneless vacuum-packed hams 6–12 lb. So a table of 10 is one bone-in half ham, and a party of 20 is a whole bone-in ham or two halves — round up to the next available size rather than agonising over the exact pound.
Spiral, country and fresh ham are not the same food
"Ham" covers three products that need entirely different maths.
Spiral-cut ham is bone-in and pre-sliced. It is often claimed that the machine slicing recovers meat a home carver would leave behind, so a spiral ham feeds more than an uncut bone-in ham of the same weight. That is plausible, but we could not find it stated by USDA, an extension service or any other non-commercial source — only by companies selling spiral hams. Until someone measures it, treat spiral-cut as ordinary bone-in and use 1/2 lb per person. If it stretches further, you have leftovers.
Country ham is dry-cured and aged, and the USDA notes it needs soaking for 4 to 12 hours before cooking just to make it edible. It is intensely salty and is served in slices a fraction of the thickness of city ham. None of the per-person figures on this page apply to it — no government or extension source we found publishes a portion size for country ham at all. Treat it as a flavouring or a biscuit filling, not a roast.
Fresh ham is an uncured pork leg. It is raw pork, not ham in the way anyone at the table means it, and it should be portioned like a pork roast — our BBQ meat calculator is the better tool for that.
Who is telling you to buy more, and why
The USDA figures are the only ones on this subject from a body with no ham to sell, which is why they anchor this page. Worth noticing what happens when the source does sell ham: the manufacturer Hatfield recommends 0.40 lb of boneless ham per person — 20% to 60% above the USDA's boneless range for the identical cut.
Editorial sources mostly just repeat the government numbers. The Kitchn and Parade both give 1/3–1/2 lb bone-in and 1/4–1/3 lb boneless without citing anyone. That's fine — the figures are sound — but it means the apparent consensus across a dozen pages is really one source quoted a dozen times.
If ham isn't the only thing on the table
Ham peaks twice a year, at Christmas and at Easter, and the two meals behave differently. At Easter ham is usually the sole centrepiece, so use the figures above as they stand. At Christmas it very often shares the table with turkey, and doubling up on meat is the commonest way to over-cater the whole meal — take the bottom of each range for both. Our how much turkey per person guide covers the other half, and Christmas dinner quantities per person sizes the entire plate, sides included.
A cold ham on the sideboard for grazing is a third case again: people cut thin slices and pick at it over hours, so 1/4 lb (115 g) per person is plenty, and it pairs naturally with a cheese board.
Buying the rest of the meal too? Start with Christmas dinner quantities per person — it takes the ham figure above and builds the sides, gravy and drinks around it.