Buttermilk is the tangy, slightly thick liquid that was traditionally the byproduct of churning butter. Today's commercial buttermilk is made by culturing low-fat milk with lactic acid bacteria — the result is an acidic, mildly sour dairy product with a distinctive tang and about 1–2% milkfat. In cooking, that acidity is the critical component: it reacts with baking soda to create lift in pancakes and biscuits, tenderizes gluten in bread, and adds bright flavor depth to dressings, marinades, and fried chicken batters.
If you find yourself without buttermilk mid-recipe, you're in luck — it's one of the easiest ingredients to replicate at home. The key is recreating both the acidity and the approximate consistency. You can acidify regular milk with vinegar or lemon juice in just five minutes, and the results in baking are nearly indistinguishable from real buttermilk. The only thing you can't fully replicate is the probiotic complexity of cultured buttermilk, though this rarely matters in cooked dishes.
The other important thing to know is that buttermilk's primary job in most recipes is chemical: it's there to activate baking soda. As long as your substitute is acidic, it will fulfill that role. In recipes where buttermilk's flavor is front and center — like buttermilk ranch dressing or a buttermilk cake — a cultured substitute like kefir or thinned yogurt will taste more authentic than a milk-plus-acid mixture.
■Best Substitutes for Buttermilk
Most of these substitutes can be made with ingredients you already have. Use whichever fits your dietary needs and the recipe at hand.
| Substitute | Flavor / Texture Match | Swap Ratio |
|---|---|---|
| Milk + white vinegar | Excellent for baking — acidity activates baking soda well | 1 tbsp vinegar + enough milk to make 1 cup; let sit 5 min |
| Milk + lemon juice | Very close — slight lemon note, works well in most baking | 1 tbsp lemon juice + enough milk to make 1 cup; let sit 5 min |
| Plain yogurt thinned | Great flavor match — tangy and rich, slight thickness | ¾ cup yogurt + ¼ cup milk or water per 1 cup |
| Sour cream thinned | Rich and very tangy — excellent in pancakes and biscuits | ¾ cup sour cream + ¼ cup water per 1 cup |
| Kefir | Best overall substitute — naturally tangy, drinkable consistency | 1:1 |
| Plant milk + acid | Good for vegan baking — use oat or soy milk for best results | 1 tbsp lemon juice + enough plant milk to make 1 cup |
| Crème fraîche thinned | Mild tang, very rich — best for sauces and dressings | ¾ cup crème fraîche + ¼ cup water per 1 cup |
■How to Choose the Right Substitute
For baking — pancakes, waffles, biscuits, muffins, and cakes — the milk-plus-acid method is the fastest and most foolproof. It doesn't matter whether you use vinegar or lemon juice; both create enough acidity to activate baking soda. The lemon juice version can add a faint citrus note in very delicate baked goods, but in most recipes it's undetectable. This method works equally well with dairy or plant-based milk, making it ideal for vegan baking.
For recipes where buttermilk's flavor is noticeable — ranch dressings, marinades, cold sauces — kefir is the best substitute because it's a naturally fermented dairy drink with a true tangy culture flavor. Plain yogurt thinned with water or milk is a close second and is usually easier to find. In both cases, you get a more authentic buttermilk flavor than the milk-plus-acid approach delivers.
For fried chicken marinades, any of these substitutes work well, but the yogurt or kefir versions are especially effective because the cultures and lactic acid help tenderize the meat and promote browning. If you're marinating poultry or meat, sour cream thinned with a little water is also excellent — it clings to the meat well and yields an extra-crispy coating.
■Frequently Asked Questions
How long do I need to wait after adding acid to milk?
Let the mixture sit for at least 5 minutes at room temperature. You'll notice the milk start to curdle slightly and thicken — this is correct and expected. The curdling is a sign the acid is working. You don't need to wait longer than 10 minutes, and the mixture doesn't need to be perfectly smooth before you use it.
Can I use apple cider vinegar instead of white vinegar?
Yes. Apple cider vinegar works just as well as white vinegar for making a buttermilk substitute. It has a slightly fruitier, milder flavor than white vinegar, which can actually be a benefit in sweet baked goods like pancakes or muffins. Use the same ratio: 1 tablespoon per cup of milk.
Does the fat content of the milk matter when making a buttermilk substitute?
It does, somewhat. Buttermilk is a low-fat product, so skim or 1% milk with acid is the most accurate substitute. However, using whole milk with acid produces a richer result that often works even better in baking — the extra fat adds tenderness. For most recipes, use whatever milk you have on hand.
Can I freeze buttermilk if I bought a carton and only need a small amount?
Yes. Pour leftover buttermilk into an ice cube tray, freeze until solid, then transfer the cubes to a freezer bag. Each standard ice cube holds about 2 tablespoons. Thaw in the refrigerator and stir or shake before using — the texture may be slightly separated but it will work fine in recipes.
Why do my pancakes not rise as much when I use a buttermilk substitute?
This is almost always a baking soda activation issue. Make sure your baking soda is fresh (test it by dropping a pinch in hot water — it should bubble vigorously). Also make sure you're not overmixing the batter after combining wet and dry ingredients — once the baking soda reacts with the acid, you want to cook quickly. Let the batter rest no more than a few minutes before cooking.
See also: Food Substitutes Guide | Best Whole Milk Substitutes | Best Sour Cream Substitutes | Best Greek Yogurt Substitutes