A missing carton does not have to stop a batch of pancakes, biscuits, or cake. These best buttermilk substitute ideas give you seven workable options, exact one-cup ratios, and a clear explanation of when acidified milk, yogurt, sour cream, kefir, powder, cream of tartar, or plant milk makes the most sense.
The swaps are not identical. Some recreate acidity, some also restore thickness, and one may be better for a quick batter than a dressing or marinade. Use the recipe-by-recipe guide instead of choosing only by what is closest in the refrigerator.
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7 Best Buttermilk Substitute Ideas
Here are the seven best buttermilk substitute ideas that actually work in baking, ranked by how closely they mimic real buttermilk’s properties:
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Plain yogurt thinned with milk – A thick, cultured option for many baked goods (3/4 cup yogurt + 1/4 cup milk = 1 cup buttermilk)
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Milk + lemon juice or vinegar – The classic quick fix everyone should know
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Kefir – Use 1:1 as a direct replacement, nearly identical to buttermilk
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Powdered buttermilk – A shelf-stable pantry option
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Sour cream thinned with water – Excellent for rich, tender biscuits
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Milk + cream of tartar – Works in a pinch, though less reliable
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Plant milk + acid – The best dairy-free option for vegan baking
Each method has its strengths depending on what you are baking. Keep reading for the complete breakdown with ratios, timing, and practical usage notes.
What Is Buttermilk, Really?
Traditional buttermilk was the liquid left behind after churning butter from cream. It was slightly sour, thin, and packed with natural bacteria from the fermentation process. Modern buttermilk is different. Today, manufacturers add specific bacteria cultures to low-fat milk and let it ferment. This creates cultured buttermilk with that signature tangy flavor and thick consistency we expect.
The magic of buttermilk comes from lactic acid. During fermentation, bacteria convert lactose into lactic acid. This acid gives buttermilk its sour taste and also its ability to tenderize baked goods. The thickness comes from the fermentation process changing the milk proteins. Understanding this helps explain why some substitutes work better than others. You need both the acidity and something close to that creamy consistency.
What Buttermilk Does in Baking
Buttermilk is not just about flavor. It serves multiple important functions in recipes. First, the lactic acid reacts with baking soda to create carbon dioxide bubbles. This chemical reaction, called an acid-base reaction, provides leavening that makes pancakes fluffy and biscuits rise tall. Without acid, baking soda sits there doing nothing, and your baked goods turn out flat and dense.
Second, the acid in buttermilk weakens gluten strands. This creates a tender crumb in cakes and muffins. Your baked goods stay soft rather than turning tough. Third, buttermilk adds moisture without adding extra fat. The thick liquid coats flour particles and creates steam during baking, which keeps quick breads moist. Finally, that subtle tang balances sweetness and adds complexity to the flavor profile.
Using plain milk instead of buttermilk removes all of these benefits. You lose the leavening power, the tenderizing effect, and the moisture retention. This is why simply swapping milk for buttermilk almost always disappoints.
Method 1: Milk + Lemon Juice or Vinegar (The Classic)
This is the buttermilk substitute everyone learns first, and for good reason. It works, it uses ingredients you have, and it takes five minutes. The acid from lemon juice or white vinegar curdles the milk, creating something that looks and acts like buttermilk.
How to Make It
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Measure 1 tablespoon of fresh lemon juice or white vinegar into a measuring cup.
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Add milk (whole milk works best) until you reach the 1-cup line.
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Stir gently and let sit at room temperature for 5 to 10 minutes.
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The milk will curdle and thicken slightly. It is ready to use.
White vinegar and lemon juice work almost identically. Lemon juice adds a faint citrus note that works well in sweet recipes but might clash with savory dishes like ranch dressing. Distilled white vinegar is more neutral. Apple cider vinegar works too but adds its own subtle flavor.
Does It Actually Work?
Acidified milk works well in pancakes, muffins, and many quick breads, but it remains thinner and less complex than cultured buttermilk. Expect a slightly different crumb in recipes where buttermilk provides much of the body.
The difference is usually modest in muffins and quick breads. Biscuits may brown less deeply or spread more because the substitute is thinner.
Whole milk creates a richer substitute than skim milk. Reduced-fat milk still works, but the final texture can be slightly leaner.
Method 2: Plain Yogurt (Our Top Pick for Baking)
If you want the best buttermilk substitute for baking, reach for plain yogurt. Regular whole-milk yogurt, thinned with a little milk, outperforms the lemon juice method in almost every test. It has the right acidity, the right thickness, and the cultured flavor that makes baked goods taste right.
The Ratio
Mix 3/4 cup of plain yogurt with 1/4 cup of milk to equal 1 cup of buttermilk. Stir until smooth. Whole milk yogurt gives the best results, but low-fat works if that is what you have. Greek yogurt is thicker, so you will need to adjust the ratio slightly. Use 1/2 cup Greek yogurt thinned with 1/2 cup milk.
Why It Works So Well
Plain yogurt is already cultured and provides both acidity and body. Thinning it brings the consistency closer to pourable buttermilk, which makes it especially useful in cakes, muffins, and cornbread.
The flavor is better too. You get that subtle tang without any metallic aftertaste that sometimes comes from vinegar. Serious Eats’ Stella Parks gives this method a B+ grade, noting it is her top choice when real buttermilk is unavailable. The Kitchn rated regular yogurt an 8 out of 10 and Greek yogurt a 9 out of 10.
A small squeeze of lemon can add brightness when the yogurt is very mild, but it is optional.
Method 3: Sour Cream
Sour cream makes an excellent buttermilk substitute, especially for rich baked goods like biscuits and scones. It has the fat content, the tang, and the thickness your recipe craves.
How to Use It
Thin 3/4 cup of sour cream with 1/4 cup of water or milk to make 1 cup of buttermilk substitute. Mix until smooth before adding to your batter. Full-fat sour cream works best, though light sour cream will do in a pinch.
Thinned sour cream is especially useful where richness and tenderness matter, including biscuits, cakes, and muffins. Its higher fat content produces a richer result than acidified milk.
The downside? The flavor can be almost too rich for lighter recipes like pancakes or angel food cake. Save this substitute for hearty quick breads, biscuits, and coffee cakes where you want that extra decadence.
Method 4: Kefir (The 1:1 Swap)
Kefir is the underrated hero of buttermilk substitutes. This fermented milk drink works as a direct 1:1 replacement. No thinning, no mixing, no waiting. Just pour and bake.
Plain milk kefir is close to buttermilk in both acidity and pourable consistency, so it can usually replace buttermilk cup for cup.
The only challenge is availability. Not every grocery store stocks kefir, and it is more expensive than making your own substitute. But if you keep it on hand for smoothies, you have the perfect buttermilk replacement sitting in your fridge.
Method 5: Powdered Buttermilk (The Pantry Hero)
Powdered buttermilk is the answer to the “what do I do with the rest of the carton” problem. This shelf-stable powder lives in your pantry until you need it. Mix it with water, and you have instant buttermilk with zero waste.
How to Use Powdered Buttermilk
Follow the package directions, which are typically 4 tablespoons of powder mixed into 1 cup of water. Whisk thoroughly to dissolve all the powder. Some brands recommend adding the powder to your dry ingredients and using water as the liquid. Either method works.
Powdered buttermilk is dependable for baking when mixed according to its package directions. Some brands direct you to add the powder with dry ingredients and water with wet ingredients.
Powdered buttermilk is useful when you bake occasionally and want to avoid an unfinished carton. Seal it well and store it exactly as the package directs.
Method 6: Milk + Cream of Tartar
Cream of tartar is an acid that can curdle milk, creating a buttermilk substitute without the vinegar flavor. It is a decent backup option when you are out of lemons and vinegar.
Mix 1 and 3/4 teaspoons of cream of tartar with 1 cup of milk. Whisk thoroughly because cream of tartar tends to clump. Let it sit for 5 minutes before using. The result is slightly less acidic than the vinegar method, which can be good or bad depending on your recipe.
Cream of tartar can clump when stirred directly into milk, so whisk it into the dry ingredients instead. This is a backup method; acidified milk, kefir, or thinned yogurt is usually simpler.
Method 7: Dairy-Free and Vegan Options
Creating a vegan buttermilk substitute follows the same principle as the dairy version. You need an acid to curdle a creamy liquid. Plant-based milks work surprisingly well for this.
Best Non-Dairy Options
Soy milk and oat milk curdle best because they have higher protein content. Use the same ratio: 1 tablespoon lemon juice or vinegar to 1 cup plant milk. Let it sit 5 to 10 minutes until curdled. Coconut milk from a carton (not the canned kind) also works, though it adds a subtle coconut flavor that might not suit every recipe.
Almond milk is less reliable. It has very low protein, so it does not curdle as visibly. The Kitchn rated almond milk with vinegar a 1 out of 10, finding that pancakes made with it were flat and gummy. If almond milk is your only option, add a tablespoon of nutritional yeast to help with the fermentation flavor and accept that your results may vary.
For the best vegan results, use full-fat coconut milk from a carton or soy milk. These give you the closest approximation to real buttermilk’s properties. The tang from the acid helps mask any underlying plant flavors.
Buttermilk Substitute Ratios Without a Table
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1 cup acidified milk: Put 1 tablespoon lemon juice or white vinegar in a cup, then add milk to the 1-cup line; rest 5 to 10 minutes.
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1 cup thinned yogurt: Whisk 3/4 cup plain yogurt with 1/4 cup milk or water.
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1 cup thinned sour cream: Whisk 3/4 cup plain sour cream with 1/4 cup water or milk.
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1 cup kefir: Use 1 cup plain, unsweetened kefir.
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Powdered buttermilk: Follow the package ratio and add powder or water in the order the manufacturer directs.
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1 cup cream-of-tartar milk: Whisk 1 3/4 teaspoons cream of tartar into the dry ingredients, then use 1 cup milk with the wet ingredients.
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1 cup dairy-free option: Add 1 tablespoon lemon juice or white vinegar to unsweetened plant milk, then fill to 1 cup and rest.
Which Substitute Works Best for What You’re Making
Different recipes need different levels of acidity, fat, and thickness. Match the substitute to the job rather than treating every option as identical.
Buttermilk Substitute for Pancakes and Waffles
Use kefir or plain yogurt thinned with milk. Both give you that light, fluffy texture you want. The milk-plus-vinegar method works but produces slightly denser pancakes. For the absolute best results, use powdered buttermilk.
Buttermilk Substitute for Biscuits
For biscuits, thinned sour cream or plain yogurt supplies more body than acidified milk. Keep every ingredient cold and handle the dough lightly for defined layers.
Buttermilk Substitute for Cakes
Regular plain yogurt thinned with milk is perfect for cakes. It provides the tender crumb and moisture without adding too much richness. For chocolate cakes and red velvet, where buttermilk is essential for activating the baking soda and creating the right color, yogurt is your best bet.
Buttermilk Substitute for Muffins
Any substitute works well in muffins. They are forgiving. I use the milk-plus-vinegar method for my spiced banana rhubarb muffins when I am out of real buttermilk, and nobody can tell the difference. Yogurt also works beautifully here.
Buttermilk Substitute for Fried Chicken
The tang of buttermilk tenderizes chicken and helps the coating stick. For brining and soaking, use the milk-plus-vinegar or lemon juice method. You want the acidity to break down the proteins. Kefir also works as a 1:1 swap here and adds extra probiotics if that matters to you.
Acidified milk can work as a fried-chicken soak, but cultured buttermilk contributes more tang and body. Keep raw poultry and its marinade separate from ready-to-eat foods and discard used marinade.
Common Buttermilk Substitute Mistakes
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Using a sweetened product: Choose plain yogurt, kefir, sour cream, or plant milk so the recipe balance does not change.
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Guessing the volume: Put the acid in the measuring cup first, then add milk to the final line.
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Skipping the rest: Give acidified milk 5 to 10 minutes before using it.
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Using a thick dairy product straight: Thin Greek yogurt or sour cream so the batter hydrates correctly.
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Changing the baking soda automatically: Keep the recipe leavener unchanged unless you are intentionally reformulating the recipe.
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Expecting one substitute to suit every use: Acidified milk is useful in quick batters, while kefir or thinned yogurt is closer in body for biscuits and cakes.
Troubleshooting Dense or Flat Baked Goods
Sometimes even with a substitute, your pancakes come out flat or your muffins are dense. Here is how to diagnose the problem.
First, check your baking soda. If it is old, it has lost its leavening power. Baking soda absorbs odors and moisture over time, and within six months of opening, it starts to weaken. Test it by putting a spoonful in vinegar. If it fizzes vigorously, it is fine. If the reaction is weak, replace it.
Second, look at your mixing technique. Overmixing develops gluten, which creates toughness and can weigh down delicate batters. Mix just until the dry ingredients are moistened. Lumps are okay.
Third, check your oven temperature. An oven that runs cool will not set the structure quickly enough to trap the gas bubbles. Invest in an oven thermometer to verify your temperature.
Finally, test your substitute before using it. For the milk-plus-acid method, the milk should look slightly curdled and thicker after 5 minutes. If it still looks like regular milk, your acid might be weak or your milk too cold. Let it sit longer or add a few more drops of acid.
How to Store Leftover Buttermilk (And When to Freeze It)
Buying a quart of buttermilk for a recipe that needs half a cup is frustrating. Here is how to keep the rest from going to waste.
Fresh buttermilk lasts about two weeks in the refrigerator. Keep it in the coldest part of your fridge, not the door. The door temperature fluctuates too much. If it smells sour or has visible mold, discard it. Buttermilk does smell tangy naturally, so use your best judgment.
For longer storage, freeze buttermilk in measured portions such as 1/4 or 1/2 cup. Thaw in the refrigerator and stir before using in baking; the texture may separate after freezing.
Frozen buttermilk works perfectly in baked goods. The texture separates slightly when thawed, but for baking that does not matter. Stir it well before using. Do not try to use thawed buttermilk for drinking or making dressings where texture matters.
Powdered buttermilk eliminates this problem entirely. It stays fresh in the pantry for months. Just mix what you need, when you need it.
For recipes that put these techniques to work, explore the easy breakfast ideas, the old-fashioned cake recipes, or the easy dessert collection. King Arthur Baking also offers an independent buttermilk substitution comparison.
Frequently Asked Questions
What is the best substitute for 1 cup of buttermilk?
For a close cultured-dairy substitute, use 1 cup plain kefir or whisk 3/4 cup plain yogurt with 1/4 cup milk. For a fast pantry solution, put 1 tablespoon lemon juice or white vinegar in a measuring cup and add milk to the 1-cup line.
Can I use regular milk instead of buttermilk?
Plain milk lacks the acidity that many buttermilk recipes expect, especially when baking soda is present. Add lemon juice or white vinegar, or choose a cultured substitute, unless the recipe specifically says regular milk is acceptable.
Which buttermilk substitute is best for pancakes?
Acidified milk is quick and usually works well for pancakes. Plain kefir or thinned yogurt provides more body and cultured flavor if you have either one.
Can Greek yogurt replace buttermilk?
Yes, but thin it first. Whisk 3/4 cup plain Greek yogurt with 1/4 cup milk or water for approximately 1 cup of substitute. Very thick yogurt may need another small splash.
What is the best dairy-free buttermilk substitute?
Use unsweetened soy, almond, or oat milk acidified with lemon juice or white vinegar. Soy milk usually curdles most visibly, but the best option also depends on flavor, allergies, and the recipe.
Can I freeze leftover buttermilk?
Yes, for future baking. Freeze measured portions, label them, thaw in the refrigerator, and stir before use. The texture may separate, so thawed buttermilk is less appealing for drinking or uncooked dressings.
Conclusion: Choose the Best Buttermilk Substitute Ideas by Recipe
The best buttermilk substitute ideas preserve the function your recipe needs. Acidified milk restores acidity, thinned yogurt and sour cream add acidity plus body, and plain kefir offers the simplest cup-for-cup cultured swap.
Write the final ratio beside the recipe before measuring, keep sweetened products out of savory or lightly sweet batters, and avoid changing the leavener unless you are deliberately reformulating the recipe.