Every 100 kcal of oysters brings 11.6 g of protein. On that measure it ranks 94th of the 121 seafood in this database and 214th of all 796 foods on the site. Measured by weight instead, its 18.9 g per 100 g ranks 92nd in its group.
Protein accounts for roughly 46% of the calories in oysters, making it very protein-dense. The rest comes from fat and carbohydrate, so it adds a solid amount of protein while still carrying real energy - useful when you are eating to a calorie target rather than under one.
Weight for weight, oysters has 4.1 g of protein for each gram of fat (18.9 g against 4.6 g per 100 g).
Set against catfish, another seafood entry in the database, a serving carries about 0.5 g more protein (catfish has 15.6 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 32% of the 50 g FDA Daily Value for protein.
Serving sizes
Protein in common portions of oysters
Protein and calories in Oysters for 100 g, the site serving and USDA household portions.
Portion
Weight
Protein
Calories
100 g
100 g
18.9 g
163 kcal
3 oz cooked (serving used here)
85 g
16.1 g
139 kcal
1 medium
25 g
4.7 g
41 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 oysters
The nine essential amino acids in Oysters, per 100 g, per serving and per gram of protein.
Amino acid
Per 100 g
Per serving
mg per g protein
leucine
1.33 g
1.13 g
70
lysine
1.41 g
1.2 g
75
valine
0.826 g
0.7 g
44
isoleucine
0.823 g
0.7 g
44
threonine
0.813 g
0.69 g
43
phenylalanine
0.677 g
0.58 g
36
methionine
0.426 g
0.36 g
23
histidine
0.363 g
0.31 g
19
tryptophan
0.212 g
0.18 g
11
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.
18.9 g. The 3 oz cooked serving used on this page weighs 85 g and so carries 16.1 g.
How much protein do you get per 100 calories of oysters?
11.6 g. That figure divides its 18.9 g of protein per 100 g by its 163 kcal per 100 g, so it does not depend on serving size.
Is the protein in oysters complete?
Yes. The protein in oysters 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 oysters?
About 32%. One 3 oz cooked serving has 16.1 g, and the FDA Daily Value for protein is 50 g.
Figures from USDA FoodData Central record #174250 (Mollusks, oyster, Pacific, 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.