I have been there: hands covered in flour, pancake batter halfway mixed, and the recipe suddenly calls for a cup of buttermilk that I do not have. Running to the store mid-bake is not an option, and most regular milk in the fridge will leave your biscuits flat and your pancakes tough.
Here is the good news. You can learn how to make buttermilk from regular milk and vinegar in about five minutes using two pantry staples. The result is a tangy, slightly thickened substitute that behaves exactly like the real thing in pancakes, biscuits, cornbread, and cakes. I have tested this method more times than I can count, and I will walk you through the exact ratios, timing, and tricks to get it right every time.
This guide covers the basic recipe, a scaling chart for smaller batches, alternative substitutes when you have run out of vinegar, and answers to the questions I hear most often from readers.
Table of Contents
- What Is Buttermilk and Why It Matters in Baking?
- How to Make Buttermilk from Regular Milk and Vinegar (Step-by-Step)
- Alternative Buttermilk Substitutes When You Are Out of Vinegar
- Expert Tips and Troubleshooting
- Frequently Asked Questions
- Can I make buttermilk out of regular milk and vinegar?
- How much vinegar do I use for 1 cup of milk to make buttermilk?
- How long do you let vinegar sit in milk to make buttermilk?
- What happens if I replace buttermilk with regular milk?
- Does milk temperature matter for a buttermilk substitute?
- Can I freeze homemade buttermilk substitute?
- Final Thoughts
What Is Buttermilk and Why It Matters in Baking?
Traditional buttermilk was the thin, tangy liquid left behind after churning butter from cultured cream. Today’s store-bought buttermilk is made by adding live bacterial cultures to pasteurized milk, which ferment the lactose into lactic acid over several hours. That acid is what gives buttermilk its signature tang and thick body.
The acidity is the whole point in baking. When buttermilk mixes with baking soda, it creates carbon dioxide bubbles that lift biscuits and pancakes into fluffy, tender layers. The acid also weakens gluten strands, so your crumb stays soft instead of tough. Plain whole milk cannot do this without help because it is nearly neutral on the pH scale.
When you add vinegar (or lemon juice) to regular milk, you are recreating that acidic environment on the spot. The milk proteins curdle slightly, the mixture thickens, and you have a buttermilk substitute that performs identically in most recipes.
How to Make Buttermilk from Regular Milk and Vinegar (Step-by-Step)
The base ratio is simple: stir 1 tablespoon of white vinegar into 1 cup of whole milk, let it sit for 5 to 10 minutes, and use it as a 1:1 replacement for cultured buttermilk. That is the entire method.
Step 1: Measure the Acid Into a Liquid Measuring Cup
Pour 1 tablespoon of white vinegar (or apple cider vinegar) into a 1-cup liquid measuring cup. The cup makes it easy to see when you hit the 1-cup mark at the end. White vinegar is the most neutral choice. Apple cider vinegar works fine but adds a faint fruity note that can show up in delicate cakes.
Step 2: Add Milk Until You Reach 1 Cup
Pour whole milk (2% also works) into the same measuring cup until the total liquid reaches the 1-cup line. Whole milk produces the richest, closest-to-real buttermilk result because the extra fat mimics the texture of cultured buttermilk. Give it a gentle stir so the vinegar disperses through the milk.
Step 3: Let the Mixture Sit for 5 to 10 Minutes
Set the cup on the counter and walk away for at least 5 minutes. You will see the milk start to look slightly clumpy and curdled, almost like very thin yogurt. That is exactly what you want. The acid is reacting with the milk proteins, thickening the liquid and developing the tangy flavor.
If you are in a hurry, 5 minutes works. If you have 10, the flavor gets a little deeper. Do not skip this step. Adding the mixture to your batter immediately will not give the acid time to do its work, and your biscuits may not rise as well.
Step 4: Stir and Use in Your Recipe
Give the mixture one last gentle stir and pour it into your batter exactly as you would store-bought buttermilk. There is no need to strain or heat it. Use it within 10 minutes of resting for the best rise in your baked goods.
Buttermilk Substitute Scaling Chart
Most recipes call for anywhere from 1/4 cup to 1 full cup of buttermilk. Use this chart to scale the ratio without measuring every tablespoon.
- 1/4 cup buttermilk: 3/4 teaspoon vinegar + enough milk to reach 1/4 cup
- 1/3 cup buttermilk: 1 teaspoon vinegar + enough milk to reach 1/3 cup
- 1/2 cup buttermilk: 1 1/2 teaspoons vinegar + enough milk to reach 1/2 cup
- 2/3 cup buttermilk: 2 teaspoons vinegar + enough milk to reach 2/3 cup
- 3/4 cup buttermilk: 2 1/4 teaspoons vinegar + enough milk to reach 3/4 cup
- 1 cup buttermilk: 1 tablespoon vinegar + enough milk to reach 1 cup
Alternative Buttermilk Substitutes When You Are Out of Vinegar
Vinegar is the most common pantry acid, but it is not your only option. Here are the substitutions I rely on when the vinegar bottle is empty.
Lemon Juice Method
Lemon juice is the classic 1:1 swap for vinegar. Use 1 tablespoon of fresh lemon juice per 1 cup of milk, then rest for 5 to 10 minutes the same way. Lemon juice adds a slightly brighter, citrusy tang that works especially well in pancakes and vanilla cakes. It is the swap I reach for when I want a lighter, fresher flavor.
Cream of Tartar Method
Cream of tartar is a dry acid that bakers already keep on the shelf. Mix 1 3/4 teaspoons of cream of tartar into 1 cup of milk and let it sit for 10 minutes. The result is milder than vinegar but works perfectly for biscuits and scones. This is the trick I use most when I want a very neutral buttermilk flavor.
Plain Yogurt Method
Plain, unflavored yogurt is already tangy and thick, so it needs only a small thinning step. Whisk 1/3 cup of plain whole-milk yogurt with 2/3 cup of milk to make 1 cup of substitute. This version is closest to real cultured buttermilk in texture, which makes it my top pick for salad dressings and marinades.
Heavy Cream for Richer Results
If you want an extra-rich substitute for pound cake or coffee cake, swap the milk for heavy cream. Use 1 tablespoon of vinegar plus enough heavy cream to reach 1 cup. The higher fat content produces a more tender crumb and a noticeably creamier mouthfeel. I tested this in a vanilla pound cake and the texture was noticeably more velvety than with regular milk.
Dairy-Free and Vegan Options
The same acid-plus-milk method works with any unsweetened non-dairy milk. Use soy, oat, or almond milk with 1 tablespoon of vinegar per cup. Coconut milk works but adds coconut flavor, so save it for recipes where that taste fits. Let it rest for a full 10 minutes because plant milks curdle more gently than dairy.
Expert Tips and Troubleshooting
These are the small details that separate a passable buttermilk substitute from one that bakes identically to store-bought.
Milk temperature: Cold milk straight from the fridge works fine. Room temperature milk curdles a bit faster and slightly more visibly, but the final result is the same. I tested both side by side in a batch of biscuits and could not tell the difference in the finished bake.
How to tell it worked: After 5 to 10 minutes, your milk should look slightly chunky and smell faintly tangy. If it looks exactly like plain milk, your acid may have been too weak or your milk too fresh. Add another 1/2 teaspoon of vinegar and wait 5 more minutes.
Storage and freezing: Use the substitute within 10 minutes for the best rise. If you must store it, cover and refrigerate for up to 24 hours. For longer storage, pour the finished substitute into an ice cube tray, freeze, then pop the cubes into a freezer bag. Each cube is about 2 tablespoons, perfect for dropping into a single batch of pancakes later.
Does it taste exactly like real buttermilk? Honestly, no. Cultured buttermilk has a deeper, more complex tang from hours of fermentation. The vinegar version is brighter and sharper. In pancakes, biscuits, and cornbread, you will not notice. In a buttermilk pie filling where buttermilk is the star, real cultured buttermilk is worth buying.
Frequently Asked Questions
Can I make buttermilk out of regular milk and vinegar?
Yes. Stir 1 tablespoon of white vinegar or lemon juice into 1 cup of regular milk and let the mixture sit for 5 to 10 minutes. The acid causes the milk proteins to curdle and thicken, creating a buttermilk substitute that works in pancakes, biscuits, cornbread, and most baked goods calling for buttermilk.
How much vinegar do I use for 1 cup of milk to make buttermilk?
Use 1 tablespoon of white vinegar per 1 cup of milk. Stir the vinegar into the milk first, then add milk until the total liquid reaches the 1-cup mark in a liquid measuring cup. Let it rest for 5 to 10 minutes before adding to your batter.
How long do you let vinegar sit in milk to make buttermilk?
Let the vinegar and milk mixture sit for at least 5 minutes and up to 10 minutes. The rest time allows the acid to curdle the milk proteins and develop the tangy flavor. Skipping this step reduces the rise in baked goods.
What happens if I replace buttermilk with regular milk?
Plain milk lacks the acidity to react with baking soda, so baked goods will turn out flatter, denser, and tougher than they would with buttermilk. The acidic substitute version restores the leavening reaction and the tender crumb that buttermilk is known for.
Does milk temperature matter for a buttermilk substitute?
Milk temperature does not change the final result much. Cold milk straight from the fridge works fine and is the easiest option. Room temperature milk curdles slightly faster but the finished baked goods come out essentially the same.
Can I freeze homemade buttermilk substitute?
Yes. Pour the finished substitute into an ice cube tray, freeze until solid, then transfer the cubes to a freezer bag. Each cube is about 2 tablespoons, which makes it easy to grab exactly what you need for a future batch of pancakes or biscuits.
Final Thoughts
Learning how to make buttermilk from regular milk and vinegar is one of the most useful tricks in any home baker’s kitchen. Two ingredients, 5 minutes of waiting, and you are back on track with the recipe you started.
Stick to the 1 tablespoon vinegar per 1 cup of milk ratio, give it time to rest, and you will get tender, fluffy baked goods every time. Try your homemade buttermilk in our Buttermilk Cornbread Recipe, our classic Buttermilk Pie, a stack of Fluffy Pancakes, or our easy No-Yeast Soda Bread. Each one shows off the tangy lift that a good buttermilk substitute can deliver.
Keep a bottle of white vinegar in the pantry and you will never be stuck mid-recipe again.