QUICK ANSWER
How many calories are in unsweetened soy milk?
The selected unsweetened shelf-stable soy-milk record provides 38.5 kcal per 100 g. Scale from the matching edible amount and keep other states separate.
38.5 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
Unsweetened soy milk 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
- 38.5 kcal
- Protein
- 3.55 g
- Carbohydrate
- 1.29 g
- Fat
- 2.12 g
- Fibre
- 0 g
- Vitamin A
- 58.2 µg RAE
- Vitamin B-12
- 0.393 µg
- Phosphorus
- 68.6 mg
Source: USDA FoodData Central Foundation record 1999630. 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
3.55 g per 100 g. From Soy milk, unsweetened, plain, shelf stable.
Carbohydrate
1.29 g per 100 g. From Soy milk, unsweetened, plain, shelf stable.
Fat
2.12 g per 100 g. From Soy milk, unsweetened, plain, shelf stable.
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 unsweetened soy milk fits in a varied eating pattern.
Vitamin A
58.2 µg RAE per 100 g in the selected USDA record.
Vitamin B-12
0.393 µg per 100 g in the selected USDA record.
Phosphorus
68.6 mg per 100 g in the selected USDA record.
Potassium
158 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.
Unsweetened shelf-stable soy milk
Selected reference.
Sweetened soy milk
Use the exact carton label.
Flavoured soy milk
Use its product label.
Refrigerated soy milk
Use the refrigerated formulation label or matching record.
PRACTICAL CONTEXT
How unsweetened soy milk 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 math
At 38.5 kcal per 100 g, the 50 g example is 19.3 kcal.
Fibre check
The selected record lists 0 g fibre per 100 g.
Protein check
The selected record lists 3.55 g protein per 100 g.
Best logging move
Use the carton label whenever available because fortification and formulation vary; the source supplies no household portion.
QUALITY & SAFETY
How to choose, store and prepare it
Store
Store the unopened carton according to its package directions.
After opening or cutting
After opening, follow the carton directions and keep the closure clean.
Prepare
Shake or handle only as directed and observe soy-allergen labelling.
Safety boundary
Fortification, additives and storage instructions vary by product; the package label takes priority and this record sets no storage duration.
PHOTO LOGGING
How to log unsweetened soy milk 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 milk, unsweetened, plain, shelf stable.
- 02
Use edible grams. Calories are scaled from the selected per-100-g record; named portion weights come from the same local USDA record, while explicitly labelled gram examples are calculated.
- 03
Log oil, sauce, sweetener, salt and recipe ingredients separately.
- 04
Use a separate record when preparation changes the food state.
COMMON QUESTIONS
Unsweetened soy milk calorie and nutrition questions
How many calories are in 100 g of soy milk?
38.5 kcal in the selected Soy milk, unsweetened, plain, shelf stable record.
How much fibre is in soy milk?
0 g per 100 g in the selected record.
Which soy milk state does this page use?
Soy milk, unsweetened, plain, shelf stable. State and preparation are part of the answer.
Will every soy milk have these vitamin values?
No. Fortification varies by brand and market, so the carton label is the best source for a specific product.
How are the portion calories calculated?
Each portion is scaled from 38.5 kcal per 100 g. Named weights come from the selected source record; calculated gram examples are labelled.
KEEP EXPLORING
Related food guides
SOURCES & METHOD
Where these numbers come from
Soy milk, unsweetened, plain, shelf stable, per 100 g edible portion. Numeric nutrition claims use the nutrition-reviewed local USDA record. Named portion claims use source-held weights; explicitly labelled gram examples are calculations from the per-100-g record. The nutrient record does not establish storage duration, clinical advice or food-safety limits; use package directions and current authoritative guidance where relevant.
Open USDA FoodData Central Foundation record 1999630 ↗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.