QUICK ANSWER
How many calories are in soy protein isolate?
For soy protein isolate, the locked dry soy protein isolate record provides 335 kcal per 100 g; use only a matching state and source-held weight.
335 kcal / 100 gNutrition values describe a reference food state, not every individual item. Variety, water content, preparation and portion weight can change the estimate.
THE NUMBERS
Soy protein isolate nutrition facts per 100 g
The values below use the reference state shown at the top of this page. Keeping one gram basis makes it easier to compare foods before translating the values to the portion you actually ate.
- Calories
- 335 kcal
- Protein
- 88.3 g
- Carbohydrate
- 0 g
- Fat
- 3.39 g
- Fibre
- 0 g
- Sodium
- 1000 mg
- Potassium
- 81 mg
- Magnesium
- 39 mg
Source: USDA FoodData Central SR Legacy record 174276. Values may be rounded for readability.
SERVING SIZE
Calories by portion and serving weight
Words such as “small,” “medium,” “half” and “one piece” are convenient but imprecise. Grams make the estimate reproducible, particularly when natural foods vary in size.
MACROS
Carbohydrate, protein and fat explained
Protein
88.3 g per 100 g. From Soy protein isolate.
Carbohydrate
0 g per 100 g. From Soy protein isolate.
Fat
3.39 g per 100 g. From Soy protein isolate.
MORE THAN CALORIES
Fibre, vitamins and minerals
One food does not need to provide every nutrient. These are the characteristics most useful for understanding where soy protein isolate fits in a varied eating pattern.
Sodium
1000 mg per 100 g in the selected USDA record.
Potassium
81 mg per 100 g in the selected USDA record.
Magnesium
39 mg per 100 g in the selected USDA record.
Phosphorus
776 mg per 100 g in the selected USDA record.
FOOD STATE MATTERS
How preparation changes the nutrition estimate
A reliable calorie entry should describe the food you actually ate—not merely a food with a similar name.
dry soy protein isolate
Selected nutrition reference.
soy flour
Use its own matching record or product label.
tofu
Keep this state separate from the selected reference.
protein blend
Use the complete product label or recipe.
PRACTICAL CONTEXT
How soy protein isolate can fit different goals
There is no universal “good” or “bad” food. Portion, frequency, the rest of the meal, preferences and individual health needs all matter.
Portion basis
The page scales only source-held weights from 335 kcal per 100 g.
Fibre check
The selected record lists 0 g fibre per 100 g.
Protein check
The selected record lists 88.3 g protein per 100 g.
Best logging move
Match dry soy protein isolate exactly and keep soy flour separate.
QUALITY & SAFETY
How to choose, store and prepare it
Store
Keep the dry product closed and protected from moisture according to package directions.
After opening or cutting
After opening, follow the package directions and keep the container and closure clean.
Prepare
Review the package ingredient and allergen statement for soy.
Safety boundary
This page represents dry soy protein isolate; the nutrient record does not establish storage duration or clinical advice.
PHOTO LOGGING
How to log soy protein isolate more accurately
A food photo can suggest the ingredient, but it cannot always reveal exact weight, hidden oil or preparation details. These checks turn an image guess into a better estimate.
- 01
Match the exact reference state: Soy protein isolate.
- 02
Use edible grams. Every named weight is held by the selected local USDA record. The 100 g entry is the source's nutrient basis; no household portion was invented.
- 03
Log oil, sauce, sweetener, salt and recipe ingredients separately.
- 04
Use a separate record when preparation changes the food state.
COMMON QUESTIONS
Soy protein isolate calorie and nutrition questions
How many calories are in 100 g of soy protein isolate?
335 kcal in the locked Soy protein isolate record.
Which state does this soy protein isolate page use?
Soy protein isolate. State and processing are part of the answer.
How much fibre is in soy protein isolate?
0 g per 100 g in the selected record.
Is soy flour included?
No. soy flour needs its own matching record or product label.
Where do the portion weights come from?
Named weights come from the selected local USDA record; the 100 g entry is the source nutrient basis.
KEEP EXPLORING
Related food guides
SOURCES & METHOD
Where these numbers come from
Soy protein isolate, per 100 g edible portion. Numeric nutrition and named portion claims use the locked local USDA record. No household portion, search demand, storage duration, clinical effect or medical advice is inferred.
Open USDA FoodData Central SR Legacy record 174276 ↗Page reviewed 26 August 2026. We show the food state, gram basis and source record so readers can check the estimate instead of treating one number as universally exact.