Silk Soy Milk Unsweetened: Calories, Protein & Nutrition Facts

If you want a plant milk that behaves like dairy milk in your coffee and cereal — the same 8 grams of protein per cup, with no added sugar — Silk’s Unsweet Soymilk is the one to look at. Per cup (240 ml), the official nutrition panel lists 90 calories, 8 g protein, 4 g carbohydrate and 0 g added sugar, with 470 mg of calcium. That makes it one of the strongest plant milks on protein, and the only common one that matches dairy milk gram for gram on protein.

This post uses the official Silk product page for Unsweet Soymilk (silk.com), read on October 27, 2026. Every figure below comes from that page’s nutrition panel — including one small catch: Silk’s own intro copy on the same page says “only 80 calories,” while the panel itself says 90. This post uses the panel figure of 90 calories throughout, and explains the discrepancy below.

Silk Soy Milk Unsweetened Nutrition Facts

Here is the full panel for one cup (240 ml). A carton holds about 8 servings.

Nutrient	Per cup (240 ml)	% Daily Value
Calories	90	—
Total fat	4.5 g	6%
Saturated fat	0.5 g	3%
Trans fat	0 g	—
Cholesterol	0 mg	0%
Sodium	70 mg	3%
Total carbohydrate	4 g	1%
Dietary fibre	2 g	7%
Total sugars	1 g	—
Includes added sugars	0 g	0%
Protein	8 g	16%
Vitamin D	3 mcg	15%
Calcium	470 mg	35%
Iron	1 mg	6%
Potassium	370 mg	8%
Vitamin A	150 mcg	15%
Vitamin E	4 mg	25%
Vitamin B12	2.4 mcg	100%

Why You May See 80 Calories Elsewhere

Silk’s product page headline copy describes Unsweet Soymilk as having “only 80 calories,” but the nutrition facts panel on the very same page lists 90 calories per cup. Panels are the regulated label, so 90 is the figure to trust — and the one used everywhere in this post. The rest of the panel is consistent either way: 8 g protein, 0 g added sugar and 470 mg calcium.

How It Compares: Unsweet vs Original vs Dairy vs Almond

The comparison that matters most is with Silk’s own Original Soymilk — same protein, same calcium, but the sweetened version costs 20 more calories and 5 g of sugar per cup.

Drink (per cup)	Calories	Protein	Total sugars	Added sugars	Calcium
Silk Unsweet Soymilk	90	8 g	1 g	0 g	470 mg
Silk Original Soymilk	110	8 g	5 g	4 g	470 mg
Whole dairy milk	150	8 g	~12 g	0 g	~300 mg
Typical unsweetened almond milk	~30	1 g	0 g	0 g	~450 mg

Two things stand out. First, unsweetened soy is the only plant milk here that matches dairy milk on protein — almond milk, for all its low calories, gives you just 1 g. Second, the unsweetened version saves 20 calories and all 4 g of added sugar versus Silk Original, for the same protein and calcium. Dairy milk’s ~12 g of sugar is lactose, naturally present in milk, not added sugar — but it still counts toward your daily sugar intake. Almond milk figures are typical fortified values and vary by brand; the Silk figures are from Silk’s official pages, and the dairy figures match this site’s Whole Milk Nutrition post.

Is Silk Soy Milk Unsweetened Healthy?

On balance, yes — it is one of the healthiest plant milks you can buy. You get dairy-level protein, zero added sugar, only 0.5 g of saturated fat, no cholesterol, and a genuinely useful amount of calcium (470 mg, about 35% of the daily value — Silk notes this is around 50% more than dairy milk) and vitamin D (3 mcg). It is also fortified with vitamin B12, which matters if you eat little or no animal food, and it contributes 8 g of protein toward your daily target — see our Calories in Protein guide for why that number matters.

The honest caveats: it is a processed, fortified drink, not a whole food — soybeans, water, a vitamin and mineral blend, sea salt, gellan gum and natural flavour. And the allergen note is blunt: the label states “CONTAINS SOY.” If you have a soy allergy, this is not your milk, whatever its nutrition looks like.

• People cutting sugar: 0 g added sugar and just 1 g total sugar per cup.
• Dairy-free eaters who still want protein: 8 g per cup, matching dairy milk.
• Cereal and smoothie drinkers who want a milk that actually fills you up.

Is Silk Soy Milk Unsweetened Keto-Friendly?

Yes, by the numbers. Net carbs are total carbohydrate minus fibre: 4 g − 2 g = 2 g net carbs per cup. That is low enough to fit most keto plans, especially compared with dairy milk (about 12 g of carbs per cup, nearly all lactose sugar) and Silk Original (8 g carbs, 6 g net). One cup in coffee or a smoothie barely dents a 20–50 g daily carb budget; even a full cup in a big smoothie still only costs 2 g net.

Taste and Best Uses

Unsweetened means unsweetened: expect a mild, beany, creamy taste rather than the gentle sweetness of Silk Original. In coffee it behaves well and does not split as readily as some nut milks; in cereal it tastes neutral; in smoothies it disappears behind fruit. If you are switching from sweetened soy or dairy milk, give it a few days — the first glass tastes plainer than you expect, and that is the point.

• Coffee and lattes: steams and blends well, 90 calories a cup.
• Cereal and overnight oats: the protein makes breakfast more filling.
• Smoothies: adds 8 g protein without adding sugar.

The Bottom Line

Silk soy milk unsweetened gives you 90 calories, 8 g protein, 0 g added sugar and 470 mg calcium per cup — dairy milk’s protein with a third fewer calories and no added sugar. It is not the lowest-calorie plant milk (almond milk wins that), but it is the best all-rounder if protein matters to you. Just remember the soy allergen warning, and check the panel rather than the marketing copy if you ever see the 80-calorie figure quoted.