Substitute for Baking Powder in Cake: What Works

A reliable substitute for baking powder in cake is a fresh mix of baking soda and cream of tartar: use 1/4 teaspoon baking soda plus 1/2 teaspoon cream of tartar for each teaspoon of baking powder. This small-batch recipe makes enough to replace 2 teaspoons in a cake recipe, and it works best when mixed into the dry ingredients just before baking.

Ingredients

1/2 teaspoon baking soda (about 2.3 g)
1 teaspoon cream of tartar (about 3 g)
1/2 teaspoon cornstarch (about 1.3 g), optional; helps keep the dry mixture loose if you are not using it immediately

This batch replaces 2 teaspoons of baking powder in a cake recipe that serves about 8. The cake’s other ingredients stay as written. To replace a different amount, use 1/4 teaspoon baking soda and 1/2 teaspoon cream of tartar for every 1 teaspoon of baking powder; measure carefully rather than rounding up.

Instructions

Check the amount of baking powder in your cake recipe. This batch is for 2 teaspoons. If the recipe calls for 1 teaspoon, make half the batch; for 3 teaspoons, make one and a half batches. Avoid adding extra baking soda in the hope of making the cake taller, because too much can leave a soapy or bitter taste and cause the cake to rise rapidly, then sink.
Whisk the baking soda, cream of tartar, and optional cornstarch together in a small, completely dry bowl. Break up any lumps so the ingredients are evenly distributed. The cornstarch is not needed for the chemical reaction; it is simply a dry filler that makes a stored mixture easier to measure and helps limit clumping.
Add the mixture to the cake recipe’s dry ingredients and whisk them together thoroughly before combining them with wet ingredients. This distributes the leavening through the flour and helps prevent concentrated spots that can taste unpleasant. Do not sprinkle the replacement into already-mixed batter, where it may not disperse evenly.
Finish mixing the cake batter according to its recipe, transfer it to the prepared pan, and put it in the oven promptly. Cream of tartar starts reacting with baking soda once moisture is present, so the substitute does not have the same delayed, second rise as many double-acting commercial baking powders. Follow the cake recipe’s oven temperature and bake time rather than using a generic time for every cake.
Check doneness with the cake recipe’s usual cues, such as a set center and a tester that comes out clean or with a few moist crumbs. For an egg-containing cake, the USDA FSIS safe minimum for egg dishes is 160°F (71°C); a thermometer inserted into the center can confirm it has reached at least that temperature. Cool the cake as directed in its recipe before frosting or slicing.

Tips

Use fresh ingredients. Baking soda and cream of tartar need to be dry and free-flowing. If either has absorbed moisture or formed hard lumps, replace it. You can check baking soda by stirring a pinch into vinegar; active soda should fizz promptly. That check does not prove the cream of tartar is fresh, so keep it sealed and dry too.
Measure the amount the cake calls for. This substitute is suitable for replacing the stated quantity of baking powder, not for adding on top of it. Baking soda is more concentrated in flavor than baking powder, and excess can make a cake taste alkaline, brown too quickly, or collapse after rising.
Mix and bake without a long pause. The acid and soda begin producing carbon dioxide as soon as they meet moisture. Have the pan ready and the oven preheated before combining wet and dry ingredients. A long wait can let some gas escape before the cake sets.
Account for other acidic ingredients. Buttermilk, yogurt, sour cream, lemon juice, and natural cocoa can contribute acidity, but their amounts and acidity vary. Do not automatically swap all the baking powder for soda unless the cake recipe is designed for that balance; the cream-of-tartar formula is the more predictable choice when the recipe has not been developed around an acidic ingredient.

Serving Suggestions

This mixture is a leavener, not a complete cake recipe, so serve the cake you prepare with it once the cake’s own cooling and decorating instructions are complete. A plain butter or vanilla cake pairs easily with fresh berries, sliced stone fruit, or a light dusting of powdered sugar. Chocolate cake can be served with whipped cream or a scoop of ice cream, while a citrus cake works well with a simple glaze made for that recipe.

If you are baking for a gathering, choose toppings that suit the cake’s storage needs. Fresh cream, custard, or cream-cheese frosting generally calls for refrigeration; a simple sugar glaze or many buttercreams may be more tolerant of brief serving at room temperature, depending on the recipe. Keep the cake covered between servings so cut edges do not dry out.

Variations

Make a larger dry blend: For each teaspoon of baking powder needed, whisk together 1/4 teaspoon baking soda, 1/2 teaspoon cream of tartar, and optionally 1/4 teaspoon cornstarch. Scale those amounts directly for the recipe. Although a larger batch can be stored airtight in a cool, dry cupboard, fresh small batches are the dependable choice because dampness can start a reaction or make the ingredients clump.

Use an acidic liquid and baking soda: If cream of tartar is unavailable, a recipe may use baking soda with a measured acidic liquid such as vinegar or lemon juice. This changes the batter’s liquid and acid balance, so it is not a neat, universal teaspoon-for-teaspoon replacement. As a starting point for replacing 1 teaspoon of baking powder, some cake formulas use 1/4 teaspoon baking soda with about 1/2 teaspoon vinegar or lemon juice, reducing another liquid by the same amount. It is most dependable when the cake already includes an acidic ingredient and the recipe can accommodate the change; expect a slight flavor difference, particularly with lemon juice.

Use buttermilk or yogurt only in a compatible formula: These ingredients provide acid that can react with baking soda, but replacing milk with buttermilk does not by itself guarantee the right leavening. If the cake recipe was written for regular milk and baking powder, changing both the liquid and the leavener can affect the crumb. Use a tested cake formula that specifies the acidic dairy and soda amounts, or stick with the cream-of-tartar blend.

For a sponge-style cake: Some cakes rise mainly from air beaten into eggs rather than from baking powder. In an appropriate sponge recipe, carefully whipped eggs can provide lift, but simply beating extra air into an ordinary butter cake is not a reliable one-for-one replacement. Choose a recipe designed for that method instead of improvising the mixing technique midway through.

Storage and Reheating

The most reliable approach is to mix this substitute immediately before adding it to a cake’s dry ingredients. If you make extra, put the unused dry blend in a clean, airtight container in a cool, dry cupboard, label it with its ingredients and date, and use it within about one month for best performance. Discard it if it becomes damp, hard, or visibly clumped. Keep the baking soda and cream of tartar themselves tightly closed between uses.

After baking, follow the cake recipe’s storage directions, especially if it has a perishable filling or frosting. Refrigerate a cake containing cream, custard, cream cheese, or another perishable topping within 2 hours, and use refrigerated leftovers within 3–4 days. A plain cake can be wrapped and frozen for about 2–3 months; thaw it covered in the refrigerator or at room temperature, according to its filling and frosting. Cake usually does not need reheating, but an individual plain slice can be warmed briefly if desired. Reheat any leftover egg dish to 165°F (74°C); for cake, warming is for texture, not a substitute for safe storage.

Frequently Asked Questions

What is the best substitute for baking powder in cake?
The most straightforward option is 1/4 teaspoon baking soda plus 1/2 teaspoon cream of tartar for every 1 teaspoon of baking powder. For example, use 1/2 teaspoon soda and 1 teaspoon cream of tartar to replace 2 teaspoons. Mix it into the dry ingredients and bake the batter promptly.

Can I use baking soda by itself?
Usually not as a direct replacement. Baking soda needs enough acid in the batter to react, and baking powder already includes an acid ingredient. Using soda alone in a cake that was written for baking powder can leave an alkaline taste and may not give the intended rise. It is suitable only when the recipe has been balanced for soda and includes enough acidity.

Can I substitute self-rising flour for baking powder?
Not without changing the flour and salt amounts. Self-rising flour contains flour, baking powder, and usually salt, so replacing only the baking powder with it adds a large amount of extra flour and changes the recipe’s seasoning. Use it only in a recipe that gives specific adjustments for self-rising flour.

Will the cake taste like vinegar or cream of tartar?
The cream-of-tartar mixture should not give a properly balanced cake a noticeable sour flavor at the measured amount. Vinegar or lemon juice alternatives can be more noticeable, especially in a delicate vanilla cake, and may alter the flavor. If taste neutrality matters, the soda-and-cream-of-tartar blend is generally the better pantry substitute.

Can I prepare the substitute ahead of time?
Yes, a dry blend can be made ahead and stored in an airtight container away from humidity, but it is best used within about one month. Do not mix it with water, milk, or other wet ingredients in advance. Once it is in wet cake batter, get the pan into the oven promptly so less of its lift is lost while waiting.

What if I have neither cream of tartar nor baking soda?
There is no dependable dry ingredient that duplicates baking powder’s built-in base and acid. Check whether your recipe has a tested option using buttermilk, yogurt, or another acidic ingredient with baking soda, or choose a cake recipe that relies on whipped eggs for lift. Simply omitting the baking powder from a cake designed to use it will usually produce a denser result.

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