Every 100 kcal of soybeans (mature) brings 10.6 g of protein. On that measure it ranks 11th of the 31 soy foods in this database and 238th of all 796 foods on the site. Measured by weight instead, its 18.2 g per 100 g ranks 12th in its group.
Protein accounts for roughly 42% of the calories in soybeans (mature), 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, soybeans (mature) has 2 g of protein for each gram of fat (18.2 g against 8.97 g per 100 g).
Set against veggie burger, another soy food entry in the database, a serving carries about 15.6 g more protein (veggie burger has 15.7 g per 1 patty).
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 volume at 172 g, and it covers about 63% of the 50 g FDA Daily Value for protein.
One of the few plant foods that is a complete protein, with all nine essential amino acids.
Serving sizes
Protein in common portions of soybeans (mature)
Protein and calories in Soybeans (mature) for 100 g, the site serving and USDA household portions.
Portion
Weight
Protein
Calories
100 g
100 g
18.2 g
172 kcal
1 cup cooked (serving used here)
172 g
31.3 g
296 kcal
The USDA record lists no other household measure for this food; protein and calories scale from the per-100 g figures.
Amino acids
Essential amino acids in soybeans (mature)
The nine essential amino acids in Soybeans (mature), per 100 g, per serving and per gram of protein.
Amino acid
Per 100 g
Per serving
mg per g protein
leucine
1.36 g
2.34 g
75
lysine
1.11 g
1.91 g
61
valine
0.831 g
1.43 g
46
isoleucine
0.807 g
1.39 g
44
threonine
0.723 g
1.24 g
40
phenylalanine
0.869 g
1.49 g
48
methionine
0.224 g
0.39 g
12
histidine
0.449 g
0.77 g
25
tryptophan
0.242 g
0.42 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.
How much protein is in 100 g of soybeans (mature)?
18.2 g. The 1 cup cooked serving used on this page weighs 172 g and so carries 31.3 g.
How much protein do you get per 100 calories of soybeans (mature)?
10.6 g. That figure divides its 18.2 g of protein per 100 g by its 172 kcal per 100 g, so it does not depend on serving size.
Is the protein in soybeans (mature) complete?
Yes. The protein in soybeans (mature) 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 soybeans (mature)?
About 63%. One 1 cup cooked serving has 31.3 g, and the FDA Daily Value for protein is 50 g.
Figures from USDA FoodData Central record #174299 (Soybeans, mature seeds, cooked, boiled, with salt), 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.