How Much Shrimp Per Person? Buy by Type and Count

Buy about 1/2 lb of headless shell-on shrimp per person, or 1/4 lb if the shrimp are already cooked and peeled. Those are the figures NC Sea Grant’s Mariner’s Menu gives for buying seafood — “Shrimp, headed – 1/2 pound” and “Shrimp, cooked and peeled – 1/4 pound” — calculated from a serving of roughly 3.5 ounces. The gap between those two numbers is not appetite. It is shell.

Shrimp is the one protein sold in four different states, each weighing more than the next for the same amount of dinner, which is why “a pound of shrimp” tells you almost nothing on its own.

The chart

Guests	Head-on	Headless, shell-on	Peeled raw	Cooked and peeled
4	3.5 lb	2 lb	1.5 lb	1 lb
6	5 lb	3 lb	2.25 lb	1.5 lb
8	7 lb	4 lb	3 lb	2 lb
10	8.5 lb	5 lb	3.75 lb	2.5 lb
12	10 lb	6 lb	4.5 lb	3 lb
20	17 lb	10 lb	7.5 lb	5 lb
30	25 lb	15 lb	11 lb	7.5 lb

Main-course figures for adults. The two shell-on columns are the Sea Grant figures; the head-on column applies the yield rule below, and the peeled-raw column sits between the two. Halve the whole chart for shrimp served as one item on a buffet or as a starter, and see the appetite adjustments below.

The head-on rule, and why it matters at the dock

If you buy head-on shrimp — from a boat, a coastal market, or anywhere the shrimp still look like animals — you are buying a lot of weight you will never serve.

N.C. Cooperative Extension’s shrimp briefing puts a number on it: you get approximately 60% by weight of headless shrimp once the heads are removed, so you lose 40% of what you paid for. The same page gives two pieces of arithmetic worth memorising:

To estimate headless weight, multiply the head-on weight by 0.6. Ten pounds head-on is six pounds of usable shrimp.
To compare prices honestly, multiply the head-on price per pound by 1.67. Head-on shrimp at a price that looks like a bargain often is not, once the heads come off.

Peeling takes another bite on top of that, and it is the step between the second and third columns in the chart above — which is why the peeled-raw column is noticeably lighter than the shell-on one for the same number of dinners.

None of this is an argument against head-on shrimp — the heads make a better stock than anything you can buy — but it is the reason a crowd order needs to be placed in the units the recipe will use, not the units the counter is selling in.

Count size decides what the plate looks like

Shrimp are sold by count per pound, which is the number on the box: 16/20, 26/30, 41/50. It is a range, and it is the closest thing to a size label the industry has.

Count per lb	Roughly	Pieces per person at 1/4 lb peeled
U/15 (colossal)	Under 15 shrimp per lb	3–4
16/20 (jumbo)	16–20 per lb	4–5
21/25 (extra large)	21–25 per lb	5–6
26/30 (large)	26–30 per lb	6–8
31/40 (medium)	31–40 per lb	8–10
41/50 (small)	41–50 per lb	10–12

The practical rule: weight feeds people, count decides whether it looks generous. Four colossal shrimp on a plate reads as a restaurant dish; twelve small ones reads as a bowl of shrimp. For a shrimp cocktail or anything where the shrimp are the visible centrepiece, buy the biggest count you can afford and let the weight per person drop to the low end. For a pasta, a stir-fry, a gumbo or anything where the shrimp are distributed through a sauce, buy 31/40 and spend the money on the rest of the meal.

Big shrimp also have a practical advantage at a party: they are far harder to overcook, because the two-minute window in our shrimp boiling times stretches to something closer to three or four on a colossal.

Adjust for the table

A boil or a peel-and-eat pile: go up to 3/4 lb headless shell-on per adult. People eat more shrimp when they are peeling them themselves, and the shells go straight in the bin, so the visible pile shrinks fast.
Shrimp as one protein among several: halve everything. Four ounces headless is plenty next to a chicken dish.
Shrimp cocktail as a starter: 4 to 5 large shrimp per person.
Children: shrimp is the one protein where children frequently eat adult quantities or none at all. Buy for the adults and treat any child who eats them as a bonus.
Leftovers: buy extra raw, not extra cooked. Cooked shrimp reheats badly and goes rubbery; raw shrimp keeps a day in the fridge and cooks in two minutes.

Mariner’s Menu is honest about the whole exercise in a way we like: one hundred grams “is considered a serving. But in reality, we know that people usually eat more than this.”

Buying and handling it for a crowd

The same extension briefing carries the sourcing points that actually matter when you are buying twenty pounds at once:

Buy from a retailer subject to regulatory inspection. Not a cooler on a tailgate.
Transport it in a cooler, on ice, as close to 32°F as you can, and hold it below 40°F — ideally near 32°F — until you cook it.
Look for translucent shells, a moist appearance, firm flesh and a mild scent. Blackened or red edges, or a sour smell, means walk away.
Cook to an internal temperature of 145°F for at least 15 seconds, which the same page notes is what eliminates harmful microorganisms in the digestive tract — the “vein” people worry about.

If shrimp is going onto a table alongside other dishes, cook it last. Our ways to keep food warm without chafing dishes work for almost everything else on the table, and they are precisely wrong for shrimp, which keeps cooking. Serve it cold or serve it straight from the pan.

For the rest of the protein maths on a big table, the meat quantities chart covers the land animals and how much salmon per person covers the other seafood people most often under-buy.

FAQ

How many pounds of shrimp for 10 people?

Five pounds of headless shell-on, or 2.5 lb if they are already cooked and peeled. For a peel-and-eat shrimp boil, go to 7 lb.

How many shrimp per person for shrimp cocktail?

Four to five large (21/25 or 16/20) shrimp per person as a starter, which is about a quarter pound peeled.

Is 1/2 lb of shrimp per person too much?

Not for shell-on shrimp — half a pound in the shell is roughly a 3.5 to 4 oz serving once peeled. It would be a lot of peeled shrimp.

How much shrimp for a shrimp boil per person?

Three quarters of a pound of headless shell-on shrimp per adult, because a boil is a peel-your-own meal and people eat more. That is before the potatoes, corn and sausage that usually share the pot.

How do I convert head-on shrimp to headless?

Multiply by 0.6. Ten pounds of head-on shrimp becomes about six pounds headless, which is the weight every recipe and every chart above is written in.