You can use buttermilk instead of heavy cream at a ratio of 1:1 in baking — one cup of buttermilk for one cup of cream. Buttermilk is cultured milk, so it is tangy, thin and very low in fat, at around 1 to 2 percent. That makes it a strange cream substitute on paper, and a wonderful one in practice — in baking. Its acidity reacts with baking soda to give cakes and muffins a lift that cream cannot match, its tang balances sweetness, and its thinness keeps batters light. In a sauce, the same thinness is a problem: buttermilk is far too thin to replace cream, and it curdles if you boil it. So this swap lives in the oven, not on the hob.

The ratio, in a table

The ratio is 1:1 in baking (tangier, thinner). Cream substitutes work in sauces and baking; only real cream whips to peaks. The table below converts the amounts you are most likely to meet.

Heavy cream called for Buttermilk to use Notes
1 tablespoon 1 tablespoon
1/4 cup 1/4 cup
1/3 cup 1/3 cup
1/2 cup 1/2 cup
2/3 cup 2/3 cup
3/4 cup 3/4 cup
1 cup 1 cup
1 1/2 cups 1 1/2 cups
2 cups 2 cups

By weight, one cup of heavy cream weighs about 238 grams (USDA, poured), and one cup of buttermilk weighs about 245 grams (USDA, poured). The two are close enough that a cup-for-cup swap works by volume, and the weights are useful when you want to be precise. All cup weights are approximate — densities vary by brand, by how the ingredient is packed, and by moisture — so verify with a kitchen scale where weighing matters, especially in baking.

Worked examples

A buttermilk chocolate cake that out-rises the cream version

A chocolate cake calls for 1 cup of heavy cream in the batter. Replace it with 1 cup of buttermilk, stirred in at the same stage. The buttermilk's acidity reacts with the baking soda and gives the cake a noticeably higher rise, and the tang disappears behind the cocoa. The crumb is lighter and more open than the cream version, because buttermilk is thin and does not weigh the batter down. Bake at the same temperature and check five minutes early — the lighter batter can bake slightly faster. The result is a tall, tender chocolate cake that tastes like a bakery cake, and the buttermilk is the reason.

Fluffy buttermilk pancakes for a weekend breakfast

A pancake recipe asks for 1 cup of heavy cream in the batter — an unusually rich choice. Use 1 cup of buttermilk instead, and the pancakes become the classic buttermilk pancake: tall, fluffy and golden, with a gentle tang that suits maple syrup. The buttermilk's acidity reacts with the baking soda to create bubbles that lift the pancakes, and the thin batter spreads easily in the pan. Cook over medium heat and flip when bubbles appear on the surface. This is the recipe where the swap is not a compromise but a correction — buttermilk pancakes are a classic, and cream pancakes are a mistake.

A red velvet cake where buttermilk is the original

A red velvet cake calls for 1 cup of heavy cream. Replace it with 1 cup of buttermilk, and you are not substituting at all — you are restoring the original recipe. Traditional red velvet cake is made with buttermilk: the acidity reacts with the cocoa and the baking soda to give the cake its tender crumb and its reddish colour, and the tang balances the sweet cream cheese frosting. Use the buttermilk at room temperature, add it at the same stage as the cream, and bake as usual. The cake will be lighter, tangier and more authentic than the cream version.

What changes in the result

Three things change when you use buttermilk instead of cream. First, the flavour: buttermilk is tangy, with a cultured sharpness that cream does not have. In a chocolate cake, a red velvet cake or a pancake, the tang is welcome; in a vanilla dessert or a cream sauce, it can taste sharp. Second, the texture: buttermilk is thin — far thinner than cream — so batters are lighter and cakes rise higher, but sauces made with it are watery and disappointing. Third, the chemistry: buttermilk is acidic, so it reacts with baking soda and gives extra lift, which is the real reason bakers love it. The fat is almost nothing, so the result is much lighter than a cream version. In baking, all three changes are benefits. In a sauce, all three are problems.

When not to substitute

Do not use a substitute where the recipe needs whipped cream, and do not boil yogurt or sour cream. Do not use buttermilk instead of cream in a sauce or a soup — it is far too thin, and it will curdle if you boil it, leaving a grainy, separated mess. Do not use it in whipped cream, ganache or any dessert where cream's richness is the point. Do not use it in a recipe that has no baking soda, because the acidity will not be neutralised and the cake can taste sour and rise poorly. And do not use a buttermilk substitute made from milk and lemon juice in a recipe that needs real buttermilk's thickness — the homemade version is thinner and behaves differently. If the recipe is a sauce, use a different cream substitute.

Practical guidance

Use real cultured buttermilk, not a homemade milk-and-vinegar mixture, for the best rise and flavour. Bring it to room temperature before baking so it mixes evenly and does not chill the batter. Add it at the same stage the cream would go in, and do not overmix once it is in — the thin batter can tempt you to keep stirring, and overmixing makes tough cakes. If the recipe uses baking powder only, add a pinch of baking soda to neutralise the buttermilk's acidity, or the cake can taste sour. In a recipe that already uses baking soda, the buttermilk will do the lifting for you. All amounts here are approximate, and the 1:1 ratio is by volume; verify with a kitchen scale where weighing matters, especially in baking, where a cup of buttermilk weighs about 245 grams.

Frequently asked questions

How much buttermilk do I use instead of heavy cream?

Use the same amount: 1 cup of buttermilk for 1 cup of heavy cream, in baking. Buttermilk is thin and tangy, so it works best in cakes, muffins and pancakes, where its acidity gives extra lift with baking soda.

Can I use buttermilk instead of cream in a sauce?

No. Buttermilk is far too thin to replace cream in a sauce, and it curdles if you boil it. Use it in baking only, and choose a different substitute — such as milk and butter, or evaporated milk — for sauces.

Will buttermilk whip like heavy cream?

No. Buttermilk is very low in fat and very thin, so it will never whip. It is a baking substitute, not a whipping one. For whipped cream, you need real heavy cream.

Does buttermilk make cakes rise more than cream?

Yes, when the recipe contains baking soda. Buttermilk is acidic, and the acid reacts with baking soda to produce extra lift. That is why buttermilk cakes and pancakes are famously tall and fluffy.

Can I make buttermilk from milk and lemon juice for this swap?

You can, but the result is thinner than real cultured buttermilk and behaves differently in baking. For the best rise and flavour, use real cultured buttermilk. The homemade version works in a pinch, but expect a slightly denser cake.

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