Every 100 kcal of soy protein isolate brings 26.4 g of protein. On that measure it ranks 1st of the 11 protein supplements in this database and 1st of all 796 foods on the site. Measured by weight instead, its 88.3 g per 100 g ranks 1st in its group.
About 105% of the calories in soy protein isolate 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, soy protein isolate has 26 g of protein for each gram of fat (88.3 g against 3.39 g per 100 g).
Set against soy protein concentrate, another protein supplement entry in the database, a serving carries about 6.9 g more protein (soy protein concentrate has 17.8 g per 1 oz).
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 28 g, and it covers about 49% 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 protein isolate
Protein and calories in Soy protein isolate for 100 g, the site serving and USDA household portions.
Portion
Weight
Protein
Calories
100 g
100 g
88.3 g
335 kcal
1 oz (serving used here)
28 g
24.7 g
94 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 soy protein isolate
The nine essential amino acids in Soy protein isolate, per 100 g, per serving and per gram of protein.
Amino acid
Per 100 g
Per serving
mg per g protein
leucine
6.78 g
1.9 g
77
lysine
5.33 g
1.49 g
60
valine
4.1 g
1.15 g
46
isoleucine
4.25 g
1.19 g
48
threonine
3.14 g
0.88 g
36
phenylalanine
4.59 g
1.29 g
52
methionine
1.13 g
0.32 g
13
histidine
2.3 g
0.64 g
26
tryptophan
1.12 g
0.31 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 protein supplements by protein per calorie
No other protein supplement entry in the database gives more protein per 100 kcal than soy protein isolate.
Closest in protein per calorie
Gelatin powder - 25.6 g per 100 kcal, 6 g per 1 envelope
How much protein is in 100 g of soy protein isolate?
88.3 g. The 1 oz serving used on this page weighs 28 g and so carries 24.7 g.
How much protein do you get per 100 calories of soy protein isolate?
26.4 g. That figure divides its 88.3 g of protein per 100 g by its 335 kcal per 100 g, so it does not depend on serving size.
Is the protein in soy protein isolate complete?
Yes. The protein in soy protein isolate 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 protein isolate?
About 49%. One 1 oz serving has 24.7 g, and the FDA Daily Value for protein is 50 g.
Figures from USDA FoodData Central record #174276 (Soy protein isolate), 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.