What is the difference between heavy cream and sour cream?

Heavy cream is unfermented, rich, and pourable, while sour cream is cultured, tangy, and thick. The fat content drives most of it: heavy cream is 35.6g of fat per 100g against sour cream's 18g, which is why heavy cream lands at 343 calories per 100g and sour cream at 196. Sour cream also holds a bit more protein, 3.1g per 100g versus 2g.

Which has fewer calories, heavy cream or sour cream?

Sour cream, by a wide margin. At 196 calories per 100g it carries far less than heavy cream's 343. The gap shows in real servings too: a tablespoon of heavy cream is 51 calories, while two tablespoons of sour cream come to about 60. For a half-cup, heavy cream hits 408 calories against 225 for sour cream.

Can I substitute heavy cream for sour cream?

Sometimes, but expect a different result. Sour cream's tang and thick body do not come from heavy cream, though adding lemon juice helps fake the acidity. Heavy cream brings 35.6g of fat per 100g versus 18g in sour cream, so it is richer and thinner. Heavy cream cannot match sour cream as a cold topping, and sour cream can curdle if you boil it in a sauce meant for cream.

Is heavy cream or sour cream better for keto?

Both fit keto, with a slight edge to heavy cream on carbs. Heavy cream has 3.8g of net carbs per 100g, about 0.5g per tablespoon, while sour cream runs 5.6g per 100g, roughly 1.7g in a 2-tablespoon serving. Heavy cream's higher fat, 35.6g versus 18g per 100g, also makes it the better pick for adding fat to coffee or sauces.

Which has more protein, heavy cream or sour cream?

Sour cream, though neither is a real protein source. Sour cream has 3.1g of protein per 100g compared to 2g in heavy cream. Across a half-cup that works out to roughly 3.6g for sour cream versus 2.4g for heavy cream. If protein is the goal, Greek yogurt at around 10g per 100g beats both by a wide margin.

Which has more saturated fat?

Heavy cream, easily. Its 35.6g of total fat per 100g is mostly saturated, around 22g, while sour cream's 18g of total fat is roughly half that load. Per tablespoon heavy cream adds 51 calories of mostly fat, so a few splashes in coffee climb quickly. Sour cream's 196 calories per 100g make it the lighter choice for everyday dolloping.

Can I use sour cream instead of heavy cream in cooking?

In savory dishes, often yes. Sour cream's 18g of fat per 100g is enough to enrich soups, chili, and stroganoff, and it saves calories at 196 per 100g versus 343 for heavy cream. The two big limits: sour cream can curdle at a hard boil, so stir it in off the heat, and it will not whip into peaks the way heavy cream's 35.6g of fat allows.

Heavy Cream

Sour Cream

All Comparisons

Heavy Cream vs Sour Cream

Sour Cream

Wins in 4 of 6 categories

Compare heavy cream and sour cream calories, fat, protein, and carbs. See which works for keto, when to substitute one for the other, and which is lighter.

Verdict (USDA data)

Per 100g, Heavy Cream has 343 calories vs Sour Cream's 196. Sour Cream has more protein (3.1g vs 2g) and less fat (18g vs 35.6g).

Sources: Heavy Cream (FDC 2346386) · Sour Cream (FDC 2346387)

Nutrition Comparison (per 100g)

Nutrient	Heavy Cream		Sour Cream
Calories	343	vs	196
Protein	2g	vs	3.1g
Carbs	3.8g	vs	5.6g
Fat	35.6g	vs	18g
Fiber	0g	vs	0g
Sodium	21mg	vs	50mg

Winner determined by: fewer calories, more protein, more fiber, less fat, less sodium

Source: USDA FoodData Central. Heavy Cream: FDC 2346386 · Sour Cream: FDC 2346387.

When to Choose Each

Choose Heavy Cream when:

You're on keto and want the lowest net carbs (3.8g per 100g)
You need to whip it or make a rich cream sauce (35.6g fat per 100g)
You want maximum fat for bulletproof coffee (51 calories per tablespoon)
You're enriching a sauce that will simmer without curdling

See full Heavy Cream nutrition

Choose Sour Cream when:

You want fewer calories (196 vs 343 per 100g)
You want a tangy topping for tacos, chili, or baked potatoes
You want slightly more protein and calcium (3.1g and 107mg per 100g)
You're dolloping rather than pouring (about 60 calories per 2 tablespoons)

See full Sour Cream nutrition

Frequently Asked Questions

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Last updated: 2026-06-23

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