Substitute for Buttermilk in Baking | The DIY Fix That Works

Milk plus one tablespoon of vinegar or lemon juice per cup is the most reliable substitute for buttermilk in baking, matching its acidity and texture for a perfect 1:1 swap.

You open the fridge for buttermilk and find an empty carton. The fix takes five minutes with regular milk and a splash of vinegar or lemon juice. This standard method works in pancakes, biscuits, cakes, and quick breads.

Milk And Acid: The Standard Buttermilk Replacement

The soured milk method replicates buttermilk’s two critical jobs: its acidity activates baking soda for rise, and its slight curdle gives batters a tender crumb. For one cup of substitute, put one tablespoon of white vinegar or fresh lemon juice in a measuring cup, then add milk to the one-cup line. Whole milk gives the best texture, but 2% or skim works fine. Stir once, let it sit at room temperature for 5 to 15 minutes, and you’ll see the milk thicken and form small curds — that’s the signal it’s ready. Use it immediately as a straight 1-to-1 swap in any recipe. Don’t skip the sitting time. If you’re in a hurry, warm the milk for 30 seconds in the microwave before adding the acid — it speeds the curdling to about 5 minutes.

Other Dairy Substitutes You Probably Have

If you’re out of milk too, three other common dairy ingredients work with minor adjustments. Plain yogurt is the closest swap: use one cup of yogurt thinned with a quarter cup of water or milk — thin more if using thick Greek yogurt. Sour cream also works: mix three-quarters of a cup of sour cream with a quarter cup of water or milk, whisking until smooth. Plain kefir substitutes cup for cup with no extra work, but make sure it’s unsweetened. Cream of tartar is another pantry option: dissolve one and three-quarters teaspoons in one cup of milk. To avoid clumps, mix the powder with a small splash of milk first to form a paste, then stir in the rest. This works best in recipes where the slight tang of vinegar or lemon isn’t wanted. Avoid substituting heavy cream without adjusting for acidity — if you use it, swap your recipe’s baking soda for baking powder, or add a dash of lemon juice.

Dairy-Free Buttermilk Substitutes

Unsweetened soy milk is the most reliable dairy-free option because its protein content helps it curdle like dairy milk. Stir one tablespoon of lemon juice or vinegar into one cup of unsweetened soy milk and let it sit for five to ten minutes. Oat milk and almond milk work too, though the curdle is less pronounced. For a thicker option, combine three-quarters of a cup of plain almond milk yogurt with a quarter cup of unsweetened almond milk and half a teaspoon of white vinegar, let it sit for five to ten minutes. Avoid sweetened or flavored plant milks and yogurts.

Whichever substitute you choose, don’t use more than two tablespoons of acid per cup of milk. Always check that yogurt, kefir, or plant-based alternatives are plain and unsweetened.

Using Buttermilk Substitutes Across Recipes

These substitutes work in every context where buttermilk is called for — pancakes, waffles, muffins, cakes, biscuits, quick breads, and brining chicken. For dips and salad dressings, use plain yogurt without heavy thinning. If a recipe calls for both buttermilk and baking soda, the substitute’s acid is essential. If it calls for buttermilk and baking powder only, the substitute still works for flavor and tenderness, but you can also just use regular milk with a splash of lemon juice for taste.