If you’ve ever stood in the frozen seafood aisle staring at rows of shrimp boxes labeled with random numbers like “41/50” or “U15,” you’re not alone. When I first started selling frozen shrimp directly to buyers, I’d get 10+ messages a week asking the same question: “What size frozen shrimp should I even buy?” Most people think it’s just about picking the biggest for the best price, but trust me, there’s way more to it—especially if you’re buying from a small-scale supplier like me who works directly with fishing boats to skip the middleman. Let’s break this down like we’re grabbing coffee and chatting, no fancy jargon required. Frozen Shrimp
First, let’s get the basics out of the way so you stop overcomplicating the numbers. The numbers on every frozen shrimp box? That’s the count per pound (or per kilogram, depending on where you’re shopping). So if a box says 21/25, that means roughly 21 to 25 shrimp in one pound. U15? That’s “under 15”—so fewer than 15 big shrimp per pound. Then there’s stuff like 51/60, which is tiny, like for salads or cocktail parties. I’ve seen so many buyers pick a size just because it looks big, but that’s a mistake for two big reasons: price per serving and how the shrimp works with your recipe.
Let’s start with price. I don’t mark up my shrimp like the big chain warehouses do, so I can tell you straight: bigger shrimp aren’t always a better value. Wait, hear me out. A pound of U15 shrimp is, yes, way bigger—each one might be the size of your thumb, perfect for a shrimp boil where you’re serving one per plate. But if you’re making stir-fry, tacos, or shrimp scampi where you need 4 to 5 shrimp per person, a pound of U15 might only feed 3 people. That same pound of 31/35 (medium-large) shrimp? You’ll get 31 to 35, so 4 per person feeds 8 people for the same total cost. Last quarter, a restaurant owner bought 100 pounds of 21/25 for a seafood platter, and halfway through the order he texted me saying he should’ve gone with 31/35—his customers were complaining the portions were too small, and he lost $1,200 in potential sales that weekend. That’s the kind of real, on-the-ground stuff I don’t see in any generic “seafood buying guide” online.
Then there’s recipe compatibility, which is where most buyers mess up. Let’s go through common use cases so you can match a size to what you’re actually cooking, no guesswork. If you’re throwing a summer shrimp boil, or making shrimp skewers for a BBQ? Go for 16/20 or U15. These big shrimp hold up to boiling, grilling, and don’t fall apart when you toss them with corn and potatoes. I sell these most often to home cooks who host parties, and they tell me every time their guests go crazy for how “plump” and juicy they are. The only catch? Don’t overcook them—they’re so big they’ll get rubbery if you leave them on the stove for 5 extra minutes.
If you’re making stir-fry, shrimp tacos, or shrimp scampi (the creamy garlic kind, not the tiny cocktail shrimp version), go for 26/30 or 31/35. These medium-large shrimp are the sweet spot: small enough that you can pile them into a taco without it falling apart, but big enough that you don’t feel like you’re eating a tiny snack. I sell way more of these than any other size because they’re versatile—one pound of 31/35 is perfect for a weeknight dinner for two, or serving 4 people for a casual get-together. Last month, a food truck owner told me he switched from 16/20 to 26/30 and saw 15% more repeat customers because his tacos had enough shrimp to satisfy, not leave people going back for a side.
For salads, cocktail parties, or adding shrimp to pasta dishes where you don’t want the shrimp to overpower the other ingredients? 41/50 or 51/60. These are the tiny, bite-sized shrimp that are great for popping into a martini glass for cocktail hour, or tossing into a Caesar salad so every forkful has a little seafood flavor. I’ve had home bakers use 51/60 for shrimp deviled eggs—they’re the right size to fit in the egg white cup without being too big. The only downside? They don’t hold up to grilling or boiling for long periods of time, so stick to recipes where you’re just sautéing or adding them at the end.
Now, let’s talk about something most people don’t consider when buying frozen shrimp: how the size affects quality. When shrimp are bigger, they’re older and have more time to absorb nutrients from the ocean, but they’re also more prone to freezer burn if they’re not frozen quickly. That’s why I work with flash-freezing equipment on the boats—we freeze the shrimp within 15 minutes of being caught, so the texture stays intact no matter the size. The 41/50 shrimp, which are smaller, actually hold up better in the freezer long-term because their shells are thinner, so they don’t get that dry, chalky texture that big shrimp sometimes get if they’re stored too long. A lot of my regulars buy 41/50 in bulk because it lasts 3-6 months in the freezer without going bad, which is a big plus for people who don’t cook seafood every single week.
I also get questions all the time about “count per kg” vs. “count per pound”—it’s the same thing, just a different measurement. If you’re buying in metric, U15 is still under 15 per kg, 21/25 is 21-25 per kg, same as the pound version. Don’t let that confuse you, it’s just a regional thing. Some customers in Europe ask for kg counts, others in North America ask for pounds, I just adjust the numbers on the box no matter what they need.
Wait, let’s address a myth I hear constantly: “Smaller shrimp are less fresh.” That’s totally not true. Freshness has nothing to do with size, it has to do with how quickly you freeze them after catching. I don’t source shrimp from tanks in grocery stores that sit around for days—mine are caught, cleaned, flash-frozen, and shipped to your door within 48 hours. The smaller shrimp (like 41/50) are actually from younger shrimp, which means they have a milder, sweeter flavor, whereas the big U15 have a richer, brinier taste. That’s just preference, not a quality difference. I had a chef friend test both last year—he did a blind taste test with 10 people, and 6 liked the smaller 41/50 better for pasta, and 4 liked the U15 better for grilling. No clear winner, just what you’re used to.
Another thing to watch for: some suppliers list shrimp size as “raw” vs. “cooked.” I only sell raw frozen shrimp, because cooked frozen shrimp loses texture when it’s thawed and reheated. If you buy cooked, by the time it gets to you, it’s probably been thawed and refrozen once, so it gets rubbery. That’s a trick a lot of big brands use to cut costs, so make sure if you’re buying raw, the size is counted before cooking. Raw shrimp shrink about 20% when you cook them, so a U15 raw shrimp will turn into a 12-14 cooked shrimp, which is important for portioning. If you’re planning for cooked servings, add 20% more to your raw size count. For example, if you want 10 cooked shrimp per person, you need 12-13 raw shrimp, so go for a size that gives you 15 per pound, which would be roughly U15 raw.
Now, let’s get real about my own customers’ biggest mistakes. The number one mistake I see people make? Buying the biggest shrimp they can afford, no matter the recipe. I had a family come in last spring, they bought 20 pounds of U15 for a weeknight dinner, and half of it went to waste because their kids hated the big, firm texture. They ended up giving the rest to a neighbor who hosts a weekly shrimp boil. That’s $80 down the drain, just because they didn’t match the size to their needs. The second biggest mistake is buying too much of one size without testing. A lot of people stick to one size forever, but mixing sizes is great—save the big ones for parties, the medium ones for weeknights, the tiny ones for snacks.
If you’re still not sure, here’s a quick cheat sheet I give all my new buyers:
- U15 / 16/20: Best for shrimp boils, grilling, skewers, seafood platters
- 21/25 / 26/30: Best for tacos, pasta, weeknight dinners, general use
- 31/35 / 41/50: Best for salads, cocktails, deviled eggs, adding to dishes without overpowering
- 51/60: Best for purees, dips, or as a garnish
At the end of the day, the right size depends on two things: what you’re cooking and how many people you’re feeding. If you’re still unsure, feel free to reach out to me. I work directly with all my buyers, no sales team, no automated messages. I can send sample packs with different sizes so you can test what you like, or give you a custom quote based on how much you need and what recipes you’re making. Whether you’re a home cook stocking up for the month, a restaurant owner needing bulk for your menu, or a small food truck looking for consistent, high-quality shrimp, I’ve got you covered. Just get in touch to talk through what you’re working on.
Horse Mackerel References
- Seafood Nutrition Partnership. (2022). Frozen Shrimp Buying Guide: Size, Freshness, and Preparation Tips.
- National Oceanic and Atmospheric Administration (NOAA). (2021). Flash Freezing Practices for Commercial Seafood: Quality and Texture Outcomes.
- Food and Agriculture Organization (FAO). (2020). Shrimp Size Classification Standards for Global Commercial Supply Chains.
- Culinary Institute of America. (2023). Recipe Pairing Guide: Shrimp Size and Dish Compatibility.
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