Blue Crab Sizes Explained: Medium, Large, Jumbo, and Colossal
Updated for the 2026 season — May 2026.
Walk up to a crab stand and you'll see signs for "#1 Jumbos," "Large #2s," or "Colossals." If you don't know what these grades mean, you might overpay for a small crab or miss the best deal on the board. Here's exactly what each size means.
How Blue Crabs Are Measured
Blue crabs are measured point-to-point — the distance across the widest part of the shell, from the tip of one lateral spine to the other. This is the standard measurement used by Maryland, Virginia, and federal regulations. A blue crab must be at least 5 inches (soft-shell limit) to be legally harvested as a hard crab in Maryland.
The informal grading system used at crab houses and markets (Small, Medium, Large, Jumbo, Colossal) corresponds roughly to these measurements, though exact cutoffs vary slightly by seller. Here's the generally accepted standard:
Size Chart with Prices
Medium
5.0–5.5" point-to-point · ~4–5 oz
Most available and affordable. Good meat-to-price ratio. Slightly more work to pick. Often labeled '#2 males' at crab houses.
Large
5.5–6.0" point-to-point · ~5–7 oz
The sweet spot for most buyers. More meat per crab than mediums, not the premium price of jumbos. Often what crab houses serve as their standard.
Jumbo
6.0–6.5" point-to-point · ~7–9 oz
Noticeably larger claws and body — easier picking, more dramatic presentation. The choice for a proper Maryland crab feast when you want to impress.
Colossal
6.5"+ (some over 7") point-to-point · ~9–12 oz
The biggest blue crabs commercially available. Jumbo claws with thick, sweet meat. Often sold as 'Colossal' or '#1 Jimmies' — genuine show-stoppers at any table.
Small
Under 5.0" point-to-point · ~2–4 oz
Less common at retail stands. When available, they're the cheapest option and are excellent for making crab soup or picking meat in bulk — more crabs for the dollar, more patience required.
What Do "#1" and "#2" Mean?
At traditional Maryland crab houses, you'll often hear "Number Ones" and "Number Twos" — these are grade designations for male crabs (called Jimmies):
Which Size Should You Buy?
For most crab feasts, Large crabs are the best all-around value. They have significantly more meat than mediums, cost less than jumbos, and are easy enough to pick for experienced eaters.
Jumbos and Colossals are worth the premium when you're hosting guests, want an impressive spread, or are eating casually without rushing. The larger claws mean more meat per pull and less frustration.
Mediums are the right choice when you're picking for a recipe (crab cakes, soup, dip) and buying in bulk. More crabs per dollar, just more work to pick.
Smalls are rare at retail. If you see them, they're typically best used for crab soup where appearance doesn't matter and you want maximum flavor per dollar.
Seasonal Notes on Size
In early spring (April–May), most available crabs will be mediums and smalls — they haven't fully grown yet after the winter. By July, the market fills with larges and jumbos. Fall crabs (September–October) are often the fattest and heaviest of the year regardless of size grade, as crabs fatten up before migrating to deeper water.
CrabStock sellers update their available sizes and prices daily — check the listing to see exactly what's available before you drive.
Related Reading
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