Calories in
soy protein isolate
335 kcal per 100 g Soy protein isolate contains 335 calories per 100 grams, or about 95 calories per oz. Per 100 g it provides 88.3 g protein, 0.0 g carbohydrate and 3.4 g fat.
By calories that splits 0% carbohydrate, 92% protein, 8% fat.
Calories in a typical serving
Per-100 g figures are useful for comparison but nobody eats 100 g of anything on purpose. These are the USDA's own household measures.
| Serving | Grams | Calories | Protein | Carbs | Fat |
|---|---|---|---|---|---|
| 1 oz | 28.4 g | 95 | 25.1 g | 0.0 g | 1.0 g |
Full nutrition, per 100 g and per oz
| Nutrient | Per 100 g | Per oz |
|---|---|---|
| Energy | 335 kcal | 95 kcal |
| Protein | 88.3 g | 25.1 g |
| Total fat | 3.4 g | 1.0 g |
| Saturated fat | 0.4 g | 0.1 g |
| Carbohydrate | 0.0 g | 0.0 g |
| Fibre | 0.0 g | 0.0 g |
| Sugars | 0.0 g | 0.0 g |
| Sodium | 1,005.0 mg | 285.4 mg |
| Potassium | 81.0 mg | 23.0 mg |
| Calcium | 178.0 mg | 50.6 mg |
| Iron | 14.5 mg | 4.1 mg |
| Vitamin C | 0.0 mg | 0.0 mg |
| Vitamin A | 0.0 µg | 0.0 µg |
| Cholesterol | 0.0 mg | 0.0 mg |
| Water | 5.0 g | 1.4 g |
USDA FoodData Central, SR Legacy (FDC ID 174276). A dash means the nutrient was not measured for this item, which is not the same as zero.
How soy protein isolate compares
Among the 75 legumes and legume products items on this site, soy protein isolate ranks 25 of 75 by calorie density, against a category average of 233 kcal per 100 g — so it is about 44% more calorie-dense than typical for its group.
It carries 26.4 g of protein per 100 calories — a genuinely protein-dense food.
To burn off one oz (95 kcal), a 70 kg adult would walk for roughly 19 minutes — see the walking calculation on our sister site, or pick a different activity. Treat that as a sense of scale rather than a rule: eating and moving are not a simple ledger.
Questions
How many calories are in soy protein isolate?
Soy protein isolate contains 335 calories per 100 g, which works out to about 95 calories per oz. It also provides 88.3 g of protein, 0.0 g of carbohydrate and 3.4 g of fat per 100 g.
What is the macro breakdown of soy protein isolate?
By calories, soy protein isolate is roughly 0% carbohydrate, 92% protein and 8% fat. That makes it a predominantly protein-based food.
How long does it take to burn off a oz?
About 19 minutes of ordinary walking for a 70 kg adult (MET 4.0). That is a rough guide for scale, not a prescription — appetite and activity interact in ways a simple subtraction does not capture.
Is this figure exact for the soy protein isolate I bought?
No. These are USDA reference values, averaged across samples. Real foods vary with variety, ripeness, growing conditions, cut, brand and how they were cooked — 10–20% either way is normal. Use them for planning, not precision.
Similar foods
Closest in calorie density within legumes and legume products.
Source: USDA FoodData Central, SR Legacy — public domain. Full USDA description: "Soy protein isolate". General information only — not medical or nutrition advice. Values are averages for a food type and vary by brand, ripeness and preparation.