Size Matters: Understanding Scallop Sizing in a Changing Global Market
From U10 giants to bite-sized 80/120s, scallop sizing is about much more than how many fit on a plate. In today’s market, size also tells a story about geography, harvest conditions, supply, and international trade.
When it comes to scallops, bigger isn’t always better—but understanding size can make a big difference. For seafood distributors, chefs, and procurement professionals, scallop sizing influences everything from portion costs and presentation to availability and profitability. With changing harvest patterns, ocean conditions, and trade policies, the numbers on a carton are more meaningful than ever.
First Things First: Why Do Scallop Sizes Work Backward?
Scallop meats are commonly graded by the number of pieces per pound. The fewer pieces needed to make one pound, the larger each individual scallop. A 10/20 contains approximately 10 to 20 meats per pound; a 40/50 contains approximately 40 to 50. The “U” means “under”—so U10 means fewer than 10 per pound.
| Size | Pieces Per Pound | Common Applications |
|---|---|---|
| U10 | Under 10 | Premium entrées; center-of-plate |
| 10/20 | 10–20 | Restaurant entrées; upscale foodservice |
| 20/30 | 20–30 | Versatile entrées; seafood dishes |
| 30/40 | 30–40 | Pasta; salads; mixed seafood |
| 40/60 | 40–60 | Stir-fries; seafood combinations |
| 60/80 | 60–80 | Soups; pasta; prepared foods |
| 80/120 | 80–120 | Seafood mixes; value-added foods |
A U10 can weigh more than four times as much as a 40/50 scallop. Both are sold by the pound—but they perform very differently on the plate and in a buyer’s margin calculation.
Geography Matters: Not All Scallops Grow Alike
United States and Canada: The Heavyweights
North Atlantic Sea scallops are known for their substantial size, with U10, 10/20, and 20/30 categories central to the foodservice trade. Harvest location, scallop age, seasonal biology, and fishing patterns all influence the size mix that reaches shore. Strong aggregate landings do not guarantee ample supplies of the largest grades.
Japan: A Different Sizing Language
Hokkaido produces highly regarded scallops valued for their sweetness, firm texture, and consistency. Japan commonly uses grade labels such as 2S, 3S, 4S and 5S based on the number of meats per kilogram—not per pound. The logic is familiar: fewer pieces per kilogram indicate a larger meat.
The reference table below converts a commonly used Japanese grading convention into approximate U.S. counts. Specifications vary by processor and contract, so buyers should always confirm the actual piece count and net weight.
| Japanese Grade | Pieces Per Kilogram | Approx. Pieces Per Pound |
|---|---|---|
| 3L | 11–15 | 5–7 |
| 2L | 16–20 | 7–9 |
| L | 21–25 | 10–11 |
| M | 26–30 | 12–14 |
| S | 31–35 | 14–16 |
| 2S | 36–40 | 16–18 |
| 3S | 41–50 | 18–23 |
| 4S | 51–60 | 23–27 |
| 5S | 61–80 | 28–36 |
| 6S | 81–100 | 37–45 |
That means Japanese 4S overlaps broadly with North American 20/30, while Japanese 5S falls near the 30/40 range. But count is not the entire story. Japanese scallops are a different species—Mizuhopecten yessoensis (also known as Patinopecten yessoensis)—from Atlantic sea scallops, Placopecten magellanicus. Texture, flavor, processing, moisture specifications, and intended application matter alongside size.
Here is the commercial twist: reduced Japanese output and tight availability of larger grades have helped push prices upward. Shifting export demand and trade relationships add further pressure. For an American buyer, Japanese scallops may still fill an important gap, but they should not automatically be viewed as a lower-cost substitute for comparable North American product.
Peru: Small Scallops, Big Market
Peruvian scallops (Argopecten purpuratus) generally run smaller than North Atlantic sea scallops. Counts such as 30/40, 40/50, and 50/60 are especially relevant to foodservice and wholesale customers. Aquaculture conditions and harvest timing have a strong influence on the grade mix.
China and Southeast Asia: The Smaller End of the Spectrum
Smaller meats—including 60/80, 80/120, and in some products even 200/300—have important roles in prepared foods, seafood mixtures, soups, and applications where piece count matters more than dramatic center-of-plate presentation. Species and commercial specifications differ significantly by origin.
The Hidden Economics of Sizing
When buying scallops, it’s easy to focus on price per pound. But that number alone doesn’t tell you what you’re actually getting—or whether you’re getting the best value.
Consider a restaurant serving a 6-ounce scallop entrée. Using illustrative prices of $28/lb. for U10 scallops and $14/lb. for 20/30s, the larger scallops cost twice as much per pound. For the same 6-ounce portion, that translates to $10.50 versus $5.25 in scallop cost.
So why would a restaurant choose the U10s? Because three large scallops can create an entirely different plate presentation than nine or ten smaller ones. For a high-end steakhouse, that visual impact may justify a higher menu price and better overall profitability. For a seafood pasta dish, however, the smaller scallops might deliver better distribution throughout the dish, more bites, and a better customer experience at half the ingredient cost.
Those numbers are examples, not live quotations. But the conclusion is real: the lowest price per pound is not automatically the best value, and the most expensive isn’t necessarily the best product. Buyers need to compare portion cost, plate coverage, yield, specifications, and the customer’s intended use.
The best count still depends on the menu, portion target and price structure. A steakhouse-style seared scallop entree has a different need from a pasta dish, breaded appetizer or a bacon-wrapped item. The count range gives the buyer a practical way to match piece size to the finished use.
Beyond the Conventional Sizes: U/12, U/15 and 15/25
U/10, 10/20 and 20/30 are familiar reference points, but commercial programs often use additional counts. U/12 and U/15 create more specific upper-count thresholds for large scallops. A 15/25 range narrows the middle ground between common 10/20 and 20/30 specifications.
These alternate designations help buyers describe a target size more precisely. If a program needs product clustered within a tighter actual-count band, that expectation belongs in the specification. A 15/25 range, by contrast, defines both a lower and upper count and narrows the middle ground between common 10/20 and 20/30 specifications.
No count label should be read in isolation. Actual count, product uniformity and the customer’s intended use remain part of the conversation. A buyer seeking three large scallops per plate has a different objective from a manufacturer planning a twelve-piece bacon-wrapped tray.
When Nature Changes the Size of the Harvest
Scallops do not grow according to a purchase order. Water temperature, oxygen levels, feed availability, seasonal cycles, and grow-out conditions affect their size. In Peru, the disruptive 2026 El Niño conditions have prompted concern about mortality and production losses. Some producers have harvested early to reduce exposure, bringing smaller scallops to market rather than waiting for larger grades.
That creates a subtle but important problem: an origin can have product available overall while being short of the specific larger counts buyers need. Similar size-specific constraints can occur in wild fisheries when harvests concentrate in different beds or year classes.
When International Politics Meets the Seafood Counter
Historically, buyers could compare origins mainly on quality, availability, and price. Today, tariffs, changing market access, restrictions, and shifting global demand affect landed costs and sourcing strategies. A trade-policy change can make one origin more expensive almost overnight—but another country may not produce a comparable species or size.
A shortage of American U10s cannot necessarily be solved with smaller Peruvian or Chinese scallops. Even when customers accept an alternative origin, differences in sizing, flavor, presentation, and packing requirements can limit substitution. The strongest sourcing programs therefore maintain flexibility without losing sight of the final application.
Three Key Takeaways for Scallop Buyers
- Larger North Atlantic scallops remain scarce. Despite relatively strong U.S. harvest volumes during 2026, large scallops—particularly U10s, U12s, and the larger end of 10/20—have been comparatively difficult to source in both the United States and Canada. Canadian quota reductions add to the constraints. Total pounds landed are not the same thing as supply of a particular count, and buyers of premium sizes should plan around continued availability pressure and elevated pricing.
- Climate disruptions are changing the size mix. El Niño-related disruptions in Peru have encouraged some producers to harvest early to avoid potential mortality, potentially increasing the proportion of smaller scallops while reducing larger-grade availability. Japan has also faced production challenges and tight supplies of bigger meats. Across origins, securing the right size can be more difficult than securing scallops in general.
- Geopolitical uncertainty rewards sourcing flexibility. Tariffs, trade-policy shifts, and evolving international demand complicate landed-cost comparisons. Japanese product has become expensive, while some competing origins cannot match North American premium sizes or specifications. Buyers who understand grade equivalencies—and who can responsibly adapt origins, counts, and product formats—are better positioned to protect service levels and margins.
How Premier Foods Approaches Size Selection
Premier Foods works across multiple sea scallop size ranges, origins and product formats. The right recommendation begins with the customer’s program rather than with one count viewed as universally best. Menu role, portion count, processing needs, target presentation, availability and budget all shape the specification.
Buyers reviewing the current Premier Foods scallop product lineup will see different size ranges across Elite, Millennium, Centurion/Select and Platinum. Availability varies by label, origin and product format, which makes the application discussion an important first step before finalizing a count.
Review the Premier Foods scallop product lineup for current label, origin, pack and size information.
The Bottom Line
The numbers on a scallop carton may look simple, but they tell a bigger story about biology, geography, economics, and global politics. Today’s challenge is not merely finding scallops at the right price. It is finding the right scallops, in the right sizes, from the right origins—and doing so consistently.
In the scallop business, knowing your numbers can be just as important as knowing your product.
