Is buttermilk keto?

Buttermilk

Not keto No — buttermilk is not keto-friendly.

About 12 g net carbs per cup — too much to drink, but a few tablespoons in ranch dressing or a marinade barely register.

Nutrition per serving

1 cup · 245 g
Net carbs
12g
Calories
98kcal
Protein
8.1g
Fat
2.6g
Total carbs
12 g
Fiber
0 g
One serving vs. a 20 g daily net-carb limit 59%

About 104 g of buttermilk adds up to 5 g net carbs — about 43% of a typical serving.

Nutrition facts for buttermilk
NutrientPer servingPer 100 g
Calories98 kcal40 kcal
Total carbohydrate12 g4.8 g
Dietary fiber0 g0 g
Net carbs12 g4.8 g
Sugars 13 g 5.4 g
Protein8.1 g3.3 g
Fat2.6 g1.1 g

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If you do eat buttermilk

  • For baking, thin sour cream with a little water and lemon juice as a lower-carb stand-in.

Better keto swaps for buttermilk

Keto milk substitutes 5 alternatives with carb comparisons and recipes Read guide

Frequently asked questions

Is buttermilk keto?

No — buttermilk is not keto-friendly. About 12 g net carbs per cup — too much to drink, but a few tablespoons in ranch dressing or a marinade barely register.

How many net carbs are in buttermilk?

1 cup (245 g) of buttermilk has about 12 g net carbs (12 g total carbs minus 0 g fiber). Per 100 g, that's 4.8 g net carbs.

How much buttermilk can I eat on keto?

About 104 g of buttermilk adds up to 5 g net carbs — about 43% of a typical serving. On a typical 20 g daily limit, one serving uses about 59% of your carbs.

What is a good keto substitute for buttermilk?

Try sour cream, heavy cream. See our full guide: keto milk substitutes.

More eggs & dairy

Full eggs & dairy list

Source: USDA FoodData Central (SR Legacy #170874): Milk, buttermilk, fluid, cultured, lowfat. Net carbs = total carbohydrate − fiber. Rating: Not keto — More than about 10 g net carbs per typical serving. Swap it for a low-carb alternative. How we rate foods. Last reviewed October 18, 2026.

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