Every 100 kcal of blue crab brings 21.6 g of protein. On that measure it ranks 14th of the 121 seafood in this database and 20th of all 796 foods on the site. Measured by weight instead, its 17.9 g per 100 g ranks 101st in its group.
About 86% of the calories in blue crab come from protein, which makes it extremely protein-dense - close to the practical ceiling for a whole food. Foods in this band are the ones that let you raise your protein intake without raising your calorie intake much at all.
Weight for weight, blue crab has 24.2 g of protein for each gram of fat (17.9 g against 0.74 g per 100 g).
Set against ocean perch, another seafood entry in the database, a serving carries about 0.5 g less protein (ocean perch has 15.7 g per 3 oz cooked).
It is a complete protein - it supplies all nine essential amino acids in adequate amounts, so it can carry a meal's protein on its own. The serving quoted here is measured by weight at 85 g, and it covers about 30% of the 50 g FDA Daily Value for protein.
Serving sizes
Protein in common portions of blue crab
Protein and calories in Blue crab for 100 g, the site serving and USDA household portions.
Portion
Weight
Protein
Calories
100 g
100 g
17.9 g
83 kcal
3 oz cooked (serving used here)
85 g
15.2 g
71 kcal
1 cup, flaked and pieces
118 g
21.1 g
98 kcal
1 cup (not packed)
135 g
24.2 g
112 kcal
1 oz
28.4 g
5.1 g
24 kcal
Portion weights are the household measures listed on the USDA record; protein and calories scale from the per-100 g figures.
Amino acids
Essential amino acids in blue crab
The nine essential amino acids in Blue crab, per 100 g, per serving and per gram of protein.
Amino acid
Per 100 g
Per serving
mg per g protein
leucine
1.31 g
1.11 g
73
lysine
1.39 g
1.18 g
78
valine
0.806 g
0.69 g
45
isoleucine
0.776 g
0.66 g
43
threonine
0.727 g
0.62 g
41
phenylalanine
0.708 g
0.6 g
40
methionine
0.452 g
0.38 g
25
histidine
0.393 g
0.33 g
22
tryptophan
0.226 g
0.19 g
13
Per-100 g values are the amino acid analysis on the USDA record. The serving and per-gram-of-protein columns are arithmetic on those values; they are not a protein quality score.
SampleWhat goal trends look like after a week
109 g
Average per logged day
4 of 7
Days goal met
71%
Complete-protein share
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Sample figures for one made-up week against a 110 g goal, not your data. Red bars met the goal. Your own log fills this in with Premium.
Related
Other seafood by protein per calorie
Swap for more protein per calorie
Salt cod - 21.7 g per 100 kcal, 17.6 g per 1 oz dried
17.9 g. The 3 oz cooked serving used on this page weighs 85 g and so carries 15.2 g.
How much protein do you get per 100 calories of blue crab?
21.6 g. That figure divides its 17.9 g of protein per 100 g by its 83 kcal per 100 g, so it does not depend on serving size.
Is the protein in blue crab complete?
Yes. The protein in blue crab supplies all nine essential amino acids in adequate amounts, so it can carry a meal's protein on its own.
What share of the protein Daily Value is one serving of blue crab?
About 30%. One 3 oz cooked serving has 15.2 g, and the FDA Daily Value for protein is 50 g.
Figures from USDA FoodData Central record #174205 (Crustaceans, crab, blue, cooked, moist heat), SR Legacy data. USDA data is in the public domain. Values are the published reference figures for that record, not lab measurements for a specific brand or batch.