How many calories are in soy milk?

Fortified original soy milk is 43 calories per 100g, so a cup at 243g is 104 calories. Dairy milk is 61 calories per 100g, oat milk 45 and almond milk 15.

How much protein is in soy milk?

2.6g per 100g, so a cup gives about 6g. That is the reason to buy it: oat milk carries 0.7g per 100g and almond milk 0.4g, while dairy milk carries 3.2g. Soy is the only common plant milk that gets close to milk on protein.

Is soy milk keto-friendly?

This carton is not. The original and vanilla row carries 4.7g of net carbs and 3.7g of sugar per 100g, so a cup is roughly 11g of net carbs. Unsweetened soy milk is a different product on the same shelf and carries a fraction of the sugar.

Does soy milk affect hormones?

The isoflavones in soy are plant oestrogens and they bind the human receptor weakly. Reviews of men drinking soy at ordinary intakes find no change in testosterone or oestrogen, and the doses used in the studies that worried people were far above a glass a day.

Is soy milk good for weight loss?

It swaps well. 43 calories per 100g against dairy milk's 61 saves roughly 45 calories a cup, and unlike almond milk at 15 calories per 100g it keeps 2.6g of protein per 100g, so the glass still does something for fullness.

Is soy milk fortified?

This one is, and it matters. 123mg of calcium and 1.1mcg of vitamin D per 100g are added rather than native to the bean, so a cup delivers about 300mg of calcium. Unfortified soy milk carries a fraction of that and the cartons look identical on the shelf.

Same bean at different concentrations. Tofu is 78 calories and 9.04g of protein per 100g where soy milk is 43 and 2.6, because tofu is the curds pressed together and the milk is what they were suspended in.

Is soy milk safe with a nut allergy?

Yes. Soybeans are legumes rather than tree nuts, which is why soy milk is the standard substitute in nut free schools. It is a top allergen in its own right though, so it is no help to anyone allergic to soy itself.

Why does soy milk curdle in coffee?

The protein that makes it worth drinking is also what coagulates in hot acidic coffee, and a light roast is the worst offender. Barista versions add stabilisers and a little more fat than the 1.5g per 100g here, which is what keeps them together.

All Foods

Calories in Soy Milk

USDA Verified · FDC 172456 · Sep 2026

104 calories

per 1 cup (243g)

2.6g

Protein

4.9g

Carbs

1.5g

Fat

0.2g

Fiber

Per 100g as prepared

Log Soy Milk in one photo

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