A kind of crab · also called Blue crab, Chesapeake blue crab

About
The Atlantic blue crab is a coastal crustacean whose body material is slightly denser than fresh water.
Atlantic blue crab material has a typical bulk density of about 65.5 pounds per cubic foot (1.05 g/mL). Because its body consists of meat, fluid, and a hard shell, it is dense enough to sink in both fresh and salt water. Compared to soft seafood like peeled shrimp or fish fillets, it takes up slightly less space for the same weight due to the mineral shell.
From Wikipedia
Callinectes sapidus, commonly known as the blue crab, Atlantic blue crab, or, regionally, the Maryland blue crab, is a species of crab native to the waters of the western Atlantic Ocean and the Gulf of Mexico, and introduced internationally.
Read more on Wikipedia →Text from Wikipedia’s “Callinectes sapidus” article, CC BY-SA 4.0.
One cup weighs
8.76 oz (248 g)
Quick answer
One US cup of Atlantic blue crab weighs about 8.7 ounces (248 grams). That is slightly heavier than an equal measure of water, weighing about the same as a cup of whole milk.
Typical figures, the same ones every comparison on the site uses; real ones vary.
More like an Atlantic blue crab
Compare it
Next to anything: a person, a car, another crab.