Every 100 kcal of soy milk brings 6.1 g of protein. On that measure it ranks 26th of the 31 soy foods in this database and 407th of all 796 foods on the site. Measured by weight instead, its 3.27 g per 100 g ranks 29th in its group.
Around 24% of the calories in soy milk come from protein, so it is moderately protein-dense. It contributes to a day's protein total, but the bulk of what it delivers is energy rather than amino acids - treat it as a contributor alongside a denser source, not as the protein in a meal.
Weight for weight, soy milk has 1.9 g of protein for each gram of fat (3.27 g against 1.75 g per 100 g).
Set against meatless deli slices, another soy food entry in the database, a serving carries about 2.9 g more protein (meatless deli slices has 5 g per 1 slice).
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 243 g, and it covers about 16% 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 soy milk
Protein and calories in Soy milk for 100 g, the site serving and USDA household portions.
Portion
Weight
Protein
Calories
100 g
100 g
3.27 g
54 kcal
1 cup (serving used here)
243 g
7.9 g
131 kcal
1 fl oz
30.6 g
1 g
17 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 soy milk
The nine essential amino acids in Soy milk, per 100 g, per serving and per gram of protein.
Amino acid
Per 100 g
Per serving
mg per g protein
leucine
0.186 g
0.45 g
57
lysine
0.131 g
0.32 g
40
valine
0.117 g
0.28 g
36
isoleucine
0.114 g
0.28 g
35
threonine
0.108 g
0.26 g
33
phenylalanine
0.113 g
0.27 g
35
methionine
0.027 g
0.07 g
8
histidine
0.061 g
0.15 g
19
tryptophan
0.038 g
0.09 g
12
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.
3.27 g. The 1 cup serving used on this page weighs 243 g and so carries 7.9 g.
How much protein do you get per 100 calories of soy milk?
6.1 g. That figure divides its 3.27 g of protein per 100 g by its 54 kcal per 100 g, so it does not depend on serving size.
Is the protein in soy milk complete?
Yes. The protein in soy milk 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 soy milk?
About 16%. One 1 cup serving has 7.9 g, and the FDA Daily Value for protein is 50 g.
Figures from USDA FoodData Central record #172446 (Soymilk, original and vanilla, unfortified), 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.