You can use sour cream instead of butter at a ratio of 1/2 cup of sour cream for every 1 cup of butter, in baking only. Like yogurt, this is a fat-reduction swap that trades butter's richness for moisture and tang: sour cream is cultured cream, and it adds a gentle acidity and a creamy richness where the butter would have been. It is the swap to use when you want a moist, tender bake with a subtle tang — in coffee cake, chocolate cake, banana bread, muffins and pound cake, where the sour cream's acidity also helps the leavening. What it cannot do is replace butter's structure, its ability to trap air, or its role in pastry, and this page explains exactly where that line falls.

Sour cream is the richest of the low-fat butter substitutes, because it still contains fat — about 20 percent, compared with butter's 80 percent. That fat is what makes it more forgiving than yogurt or applesauce: a cake made with sour cream instead of butter is moist and tender, not just moist, and the crumb has a richness that the other substitutes cannot match. It is also the substitute that professional bakers reach for most often when they want to add moisture to a cake without changing the recipe's character — a spoonful of sour cream in a chocolate cake is a classic trick, and replacing half the butter with sour cream is simply a larger version of the same idea.

The ratio, in a table

The table below converts butter to sour cream for the amounts you are most likely to meet. The rule is always the same: half as much sour cream as the butter you are replacing. The table shows the full-replacement amount — if you are replacing only half the butter, halve these numbers again and keep the rest as butter. Use full-fat sour cream: low-fat and non-fat sour creams are thinner and more watery, and they do not give the same result.

Butter called for Sour cream to use (full replacement) Notes
1 tablespoon 1 1/2 teaspoons
2 tablespoons 1 tablespoon
1/4 cup 2 tablespoons
1/3 cup 2 tablespoons + 2 teaspoons
1/2 cup 1/4 cup
2/3 cup 1/3 cup
3/4 cup 6 tablespoons
1 cup 1/2 cup
1 1/2 cups 3/4 cup
2 cups 1 cup

By weight, one cup of butter is 227 grams and half a cup of sour cream is about 115 grams (sour cream weighs 230 grams per cup). If you are weighing ingredients, that is the number to use. Note that sour cream is mostly water — about 75 percent — so you are adding moisture, not fat. That is why the result is moister but also denser: water does not tenderise crumb the way fat does, and it does not trap air the way creamed butter does.

Worked examples

Example 1: A chocolate cake with a tender crumb

A chocolate cake recipe calls for 1 cup of butter. Replace half of it — 1/2 cup of butter — with 1/4 cup of sour cream, and keep the other 1/2 cup as butter. The cake will be moist and tender, with a rich crumb and a subtle tang that deepens the chocolate flavour. The sour cream's acidity also works with the baking soda in the recipe, giving the cake a little extra lift. This half-and-half approach is the best way to start with sour cream: you get the moisture and the richness with almost none of the risk, and the cake will stay soft for days.

Example 2: Banana bread with a tangy crumb

A banana bread recipe calls for 1/2 cup of butter. Replace it entirely with 1/4 cup of sour cream. The bread will be moist and tender, with a gentle tang that balances the banana's sweetness, and it will keep well for days. Banana bread is one of the few recipes where a full sour cream replacement works well, because the banana and the sour cream complement each other, and the bread is meant to be dense and moist rather than light and fluffy.

Example 3: A coffee cake with a sour cream streusel

A coffee cake recipe calls for 3/4 cup of butter in the cake and a streusel topping. Replace half the butter in the cake — 3/8 cup — with 3 tablespoons of sour cream, and keep the rest as butter. Leave the streusel unchanged, because the streusel needs butter's solid fat to form crumbs. The cake will be moist and tender, with a tang that balances the sweet streusel, and the topping will still be crisp because it was made with butter. This is the right way to use the swap in a recipe with two different fat roles: replace the fat where it is a liquid addition, and keep it where it is structural.

What changes in the result

Three things change when you swap sour cream for butter. First, the flavour: sour cream adds a gentle, creamy tang. In chocolate cake, coffee cake, banana bread and muffins, that tang is welcome; in a vanilla cake or a butter cookie, it can taste slightly sour, which is why a half replacement is safer there. Second, the texture: the result is moister and more tender than the butter version, because sour cream's fat and water both contribute to the crumb, but it is also denser, because sour cream does not trap air the way creamed butter does. Third, the leavening: sour cream's acidity activates baking soda, so a recipe that contains baking soda may rise better with sour cream than with butter. If the recipe uses only baking powder, the acidity is neutralised and there is no leavening benefit — but the moisture remains.

The practical consequence is that sour cream is a good partial substitute in almost any muffin, quick bread or cake, and a good full substitute in chocolate cake, coffee cake and banana bread, where the tang is an asset. It is not a substitute in pastry, in cookies that need to be crisp, or in any recipe where butter's flavour is the point.

When not to substitute

Do not use sour cream instead of butter in recipes that rely on creaming butter with sugar (sponge cakes, most layer cakes, many cookies), in pastry of any kind, or in shortbread, where butter is the structure and the flavour. Do not use it in frying or sautéing — sour cream is not a fat and will curdle at high heat. Do not use low-fat or non-fat sour cream: they are thinner, more watery, and will make the bake soggy. Use full-fat sour cream. And do not use it in a recipe that is already very wet, because the extra moisture will make it soggy. The swap is baking only, and even in baking it is a partial swap first and a full swap only in forgiving recipes.

One more caution: sour cream curdles if it is heated too quickly or boiled, so do not use it in a recipe where the fat is heated to a high temperature before being added to the batter. In baking, the sour cream is mixed into a cool batter and heated gradually in the oven, which is fine. In a sauce or a soup, the same swap would fail.

Frequently asked questions

How much sour cream do I use instead of 1 cup of butter?

Use 1/2 cup of sour cream for 1 cup of butter — about 115 grams by weight. That is the full-replacement amount. For the safest result, replace only half the butter: use 1/4 cup of sour cream and keep 1/2 cup of butter. The half-and-half approach gives you the moisture and tang with almost none of the texture risk.

Can I use sour cream instead of butter in a cake?

Yes, in a strongly flavoured cake — chocolate, coffee, banana, spice — where the tang is welcome. The cake will be moister and more tender than the butter version, and it will stay soft for days. In a vanilla or white cake, the swap will add a slight tang that may not be wanted, so a half replacement is safer there.

Is sour cream the same as yogurt for baking?

They are similar but not identical. Both are cultured dairy products that add moisture and tang, and both swap at the same 1:1 ratio for each other. Sour cream is richer (about 20 percent fat, compared with yogurt's 3 to 10 percent), so it gives a more tender crumb. Yogurt is tangier and lighter. For most baking, they are interchangeable — use whichever you have — but sour cream is the better choice when richness matters, and yogurt is the better choice when you want a lighter result.

Can I use sour cream instead of butter in cookies?

In soft, chewy cookies, a half replacement works — the cookies will be softer and more cake-like. A full replacement makes cookies puffy and soft, and they will not crisp. In crisp cookies or shortbread, the swap fails: the cookies need butter's fat for their texture and flavour. For cookies, replace at most half the butter.

Does sour cream make cakes rise better?

It can, if the recipe contains baking soda. Sour cream is acidic, and its acidity reacts with baking soda to produce carbon dioxide, which lifts the cake. If the recipe uses only baking powder, the sour cream's acidity is neutralised by the powder's own acid, and there is no extra lift — but the moisture benefit remains. Do not add extra baking soda to a recipe just because you are using sour cream.

Can I use crème fraîche instead of sour cream?

Yes — crème fraîche swaps 1:1 for sour cream in baking, and it is actually better in some ways, because it does not curdle at high heat. It is richer and less tangy than sour cream, with about 30 percent fat. If you have crème fraîche, use it the same way: 1/2 cup for 1 cup of butter, or a half replacement for the safest result.

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