Easy Substitutes for Buttermilk (5 Options You Already Have)

Why Buttermilk Matters in Recipes

Before diving into substitutes, it helps to understand what buttermilk actually does. Buttermilk is acidic, with a pH around 4.5. That acidity serves two purposes in baking: it reacts with baking soda to create lift, and it tenderizes gluten, giving baked goods a softer crumb.

Any good substitute needs to replicate both of those qualities — the acidity and the liquid dairy component. The good news is that you almost certainly have at least one of these options in your kitchen right now.

1. Milk + Vinegar (The Everyday Go-To)

Ratio: 1 tablespoon white vinegar or apple cider vinegar + enough whole milk to make 1 cup

This is the most popular buttermilk substitute for a reason: it works in virtually everything. Stir the vinegar into the milk and let it sit for 5 to 10 minutes. The milk will curdle slightly and thicken — that is exactly what you want. It means the acid is doing its job.

Best for: Pancakes, waffles, quick breads, muffins, biscuits, cakes, and any recipe where buttermilk is a supporting player.

Tip: White vinegar produces a more neutral flavor. Apple cider vinegar adds a very faint fruity note that works well in spice cakes, banana bread, and anything with warm flavors.

2. Milk + Lemon Juice (Slightly Brighter Flavor)

Ratio: 1 tablespoon fresh lemon juice + enough whole milk to make 1 cup

This works identically to the vinegar method. The main difference is flavor: lemon juice adds a subtle brightness that some bakers prefer, especially in lighter recipes like scones or lemon-flavored baked goods.

Best for: Scones, lemon cakes, lighter muffins, and recipes where a hint of citrus complements the other flavors.

Tip: Use fresh lemon juice, not bottled. Bottled lemon juice has a slightly different acidity and can leave a faint metallic taste in delicate baked goods.

3. Plain Yogurt (Thinned Out)

Ratio: 3/4 cup plain yogurt + 1/4 cup whole milk, whisked until smooth (makes 1 cup)

Plain yogurt has a similar acidity and tanginess to buttermilk, making it one of the closest substitutes in terms of both chemistry and flavor. The key is thinning it out — straight yogurt is too thick and will change the texture of your batter.

Best for: Recipes where the tangy flavor of buttermilk is front and center, like buttermilk ranch dressing, buttermilk fried chicken marinades, and traditional soda bread.

Tip: Use full-fat plain yogurt for the best results. Greek yogurt works too, but thin it a bit more (use 2/3 cup Greek yogurt + 1/3 cup milk) since it is much thicker than regular yogurt.

4. Sour Cream (Thinned Out)

Ratio: 3/4 cup sour cream + 1/4 cup whole milk, whisked until smooth (makes 1 cup)

Sour cream is cultured just like buttermilk and has the right acidity. It produces slightly richer, more tender results because of its higher fat content. This can actually be an advantage in certain recipes.

Best for: Cakes (especially chocolate cake and coffee cake), rich muffins, and any recipe where extra richness is a bonus rather than a problem.

Avoid for: Recipes that need a lighter texture, like fluffy pancakes or airy biscuits. The extra fat from sour cream can make them slightly dense.

5. Milk + Cream of Tartar (The Dairy-Only Option)

Ratio: 1 and 3/4 teaspoons cream of tartar + 1 cup whole milk

Cream of tartar is a powdered acid (potassium bitartrate) that dissolves into milk and provides the acidity without adding any liquid. Whisk it in thoroughly — cream of tartar can clump if you just dump it in.

Best for: Situations where you do not want any vinegar or citrus flavor at all, or when precise acid-to-base ratios matter (like angel food cake variations).

Tip: Check your spice cabinet. Cream of tartar is the ingredient most people forget they own. It is usually hiding behind the baking powder.

What About Non-Dairy Alternatives?

If you need a dairy-free buttermilk substitute, the milk-plus-acid method works with plant milks too. Use 1 tablespoon of vinegar or lemon juice with enough unsweetened soy milk, oat milk, or almond milk to make 1 cup. Soy milk curdles most similarly to dairy milk and produces the best results in baking. Oat milk is a solid second choice. Thin coconut milk (from a carton, not a can) also works well.

Avoid rice milk for this purpose — it is too thin and does not curdle properly.

A Note on Ratios

All of these substitutes replace buttermilk at a 1:1 ratio. If your recipe calls for 1/2 cup of buttermilk, simply halve the substitute recipe. The acid-to-milk ratio stays the same regardless of the total amount.

One thing to keep in mind: if your recipe uses both baking soda and baking powder, the buttermilk substitute still works. Baking powder is double-acting and does not depend on external acid, while the baking soda will react with your substitute's acidity just as it would with real buttermilk.

Quick Summary

| Substitute | Ratio for 1 Cup | Best For | |---|---|---| | Milk + vinegar | 1 Tbsp vinegar + milk to 1 cup | Everything (most versatile) | | Milk + lemon juice | 1 Tbsp lemon juice + milk to 1 cup | Light bakes, citrus recipes | | Plain yogurt + milk | 3/4 cup yogurt + 1/4 cup milk | Tangy recipes, marinades | | Sour cream + milk | 3/4 cup sour cream + 1/4 cup milk | Rich cakes, muffins | | Cream of tartar + milk | 1 3/4 tsp cream of tartar + 1 cup milk | Neutral flavor, precise baking |

When in doubt, go with milk and vinegar. It is the most reliable, most versatile option and produces results that are virtually indistinguishable from the real thing.