Buttermilk (liquid) substitutes
Buttermilk contributes acidity, which reacts with baking soda to produce lift, and its proteins and fat coat gluten strands to produce a tender, moist crumb. It also adds a mild tang that is perceptible in low-fat baked goods, dressings, and marinades. Substituting requires matching both the acid level and the viscosity — most substitutes handle one well and approximate the other.
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| Rank | Substitute | Ratio (replaces 1 cup Buttermilk (liquid)) | Notes |
|---|---|---|---|
| #1 | Whole milk and white vinegar | 1 cup (240 ml) whole milk + 1 tbsp (15 ml) white vinegar, stirred and left to curdle 5 minutes before use | The acid curdles the milk proteins slightly, closely mimicking buttermilk's viscosity and pH; works reliably in pancakes, quick breads, cakes, and fried-chicken marinades. Use white vinegar over apple cider vinegar when you want a neutral flavor. |
| #2 | Whole milk and lemon juice | 1 cup (240 ml) whole milk + 1 tbsp (15 ml) fresh or bottled lemon juice, stirred and left to stand 5 minutes | Functionally identical to the vinegar version for leavening purposes; lemon juice adds a slightly brighter, citrusy note that is detectable in delicately flavored recipes like white cake or vanilla muffins but is a non-issue in pancakes or cornbread. |
| #3 | Plain whole-milk yogurt thinned with milk | 3/4 cup (180 g) plain whole-milk yogurt + 1/4 cup (60 ml) whole milk, whisked smooth | Yogurt has similar acidity and fat content to buttermilk and produces nearly identical tenderness and rise; texture of finished baked goods is indistinguishable in most recipes. Lower-fat yogurt works in a pinch but can make the crumb slightly drier. |
| #4 | Plain kefir | 1 cup (240 ml) plain whole-milk kefir used 1:1 in place of buttermilk | Kefir's viscosity and acidity are the closest match to commercial buttermilk of any direct swap — no thinning or acidifying required. Flavor is tangier than standard buttermilk, which is noticeable in lightly flavored recipes but a good fit for ranch dressings and biscuits. |
| #5 | Sour cream thinned with milk | 3/4 cup (180 g) full-fat sour cream + 1/4 cup (60 ml) whole milk, whisked smooth | Higher fat than buttermilk, which produces a richer, slightly denser crumb — noticeable in lean batter recipes like thin pancakes but works well in muffins and quick breads. Works in a pinch but is noticeably richer; not recommended when the recipe already has significant fat. |
When to be careful
No substitute fully replicates cultured buttermilk's flavor in recipes where that tang is the dominant note — notably buttermilk pie, old-fashioned buttermilk pound cake, or cold buttermilk-based drinks. In these cases the flavor difference between real buttermilk and an acidified-milk substitute will be clearly detectable.
Why these substitutes work
Buttermilk's acidity (roughly pH 4.4–4.8) reacts with baking soda (sodium bicarbonate) to release carbon dioxide, providing lift before and during baking. The acid also denatures milk proteins partially, which shortens gluten strands and produces a more tender crumb — the same principle as adding acid to pie dough. Milk-plus-acid substitutes replicate the pH closely enough to trigger the same leavening reaction; the slight curdling that forms reproduces the viscosity and protein structure that keeps batters smooth.
For most baking — pancakes, quick breads, biscuits, muffins, and cakes — the whole milk and vinegar or lemon juice substitutes (ranks 1 and 2) will produce results close enough to buttermilk that most people won’t notice a difference. Plain kefir (rank 4) is the best option when you want a true no-effort 1:1 swap with no measuring or waiting.
Where the substitutes fall short is in recipes that depend on buttermilk’s cultured flavor rather than just its acidity. If the recipe lists buttermilk as a primary flavoring ingredient — pie filling, a cold drink, or a dressing where the tang is the point — buying real buttermilk is the more reliable call. It keeps for several weeks in the refrigerator, and the difference in a flavor-forward recipe is worth it.
Frequently asked questions
- Can I use low-fat or skim milk to make the acidified-milk substitute?
- Yes, but the result will be thinner and slightly less tender than one made with whole milk, because lower fat means less coating of gluten strands. For cakes or biscuits where tenderness matters, whole milk gives a noticeably better result.
- Do I have to let the milk-and-acid mixture sit for 5 minutes?
- Yes — skipping that rest means the acid hasn't had time to partially curdle the milk proteins, so the mixture is thinner and closer to plain milk. Five minutes is sufficient; beyond 10 minutes there is no additional benefit.
- Can I substitute buttermilk powder mixed with water?
- Yes — most brands direct you to mix 4 tbsp (28 g) of buttermilk powder with 1 cup (240 ml) of water to equal 1 cup of liquid buttermilk. Reconstituted buttermilk powder performs well in baked goods and is a reliable pantry backup, though the flavor is slightly flatter than fresh liquid buttermilk.