Baking powder and baking soda may look alike, but they are not the same thing. They both help baked goods rise, but using the wrong one (or the wrong amount) can turn your cookies, cakes, and muffins into flat, dense disasters. If you’ve ever wondered why a recipe calls for one and not the other—or both—this is the breakdown you need.
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Baking Powder vs. Baking Soda
What Baking Soda Does in Baking
Baking soda is a base, meaning it needs an acid to react. When it meets an acidic ingredient—like buttermilk, vinegar, yogurt, or lemon juice—it produces carbon dioxide gas. This gas creates bubbles, which make the dough or batter rise.
Since baking soda starts working immediately, baked goods that use it usually need to go into the oven right away. If you let the batter sit too long, the bubbles will disappear, and you’ll end up with a dense, flat bake.
Using too much baking soda can also affect the taste. Without enough acid to balance it out, you’ll get a soapy, metallic flavor—not exactly what you want in your cookies.
Baking soda works best in recipes that already have acidic ingredients, like:
- Buttermilk pancakes
- Chocolate cake (cocoa powder is acidic)
- Gingerbread
- Banana bread
- Some cookies (especially those with brown sugar, which has molasses)
What Baking Powder Does in Baking
Baking powder is baking soda with built-in acid, meaning it doesn’t need anything extra to activate. It already contains an acid (usually cream of tartar), so when it gets wet, it starts producing gas bubbles.
Most baking powder is double-acting, which means it works in two stages—first when mixed with liquid, and again when exposed to heat. This gives baked goods a steady rise and allows you to mix the batter ahead of time without losing all the bubbles.
Because it doesn’t rely on acidic ingredients, baking powder is used in recipes that don’t have any naturally occurring acids. These include:
When a Recipe Calls for Both
Some recipes, like certain cakes and cookies, use both baking powder and baking soda. This happens when there’s some acid in the mix, but not enough to fully react with the baking soda alone. The baking powder helps ensure the batter still rises properly.
For example, a chocolate chip cookie recipe might use brown sugar (which has molasses, a weak acid), so a little baking soda is needed. But if the recipe also has lots of butter and flour, which aren’t acidic, a bit of baking powder is added to make sure the cookies get enough lift.
How to Substitute One for the Other
If you’re out of baking soda: You’ll need more baking powder to compensate. Since baking powder already contains acid, you can use about three times as much baking powder in place of baking soda. However, this can slightly affect the taste and texture.
Example: If a recipe calls for 1 teaspoon of baking soda, use 3 teaspoons of baking powder instead.
If you’re out of baking powder: You can make your own using baking soda and an acid. For every 1 teaspoon of baking powder, mix ¼ teaspoon baking soda with ½ teaspoon cream of tartar. If you don’t have cream of tartar, another acid like lemon juice or vinegar can work, but the recipe may need adjustments.
Storing and Checking Freshness
Both baking soda and baking powder lose their effectiveness over time, so it’s important to store them properly and check if they’re still active.
- Baking soda test: Mix ½ teaspoon of baking soda with a few drops of vinegar or lemon juice. If it fizzes immediately, it’s good to use. If not, toss it.
- Baking powder test: Stir 1 teaspoon of baking powder into ½ cup of hot water. If it bubbles, it’s still fresh. If nothing happens, replace it.
The Bottom Line
- Baking soda needs an acid to work. It reacts immediately and is great for recipes with buttermilk, yogurt, or brown sugar.
- Baking powder contains its own acid and works in two stages, making it ideal for recipes without acidic ingredients.
- Some recipes use both to control the rise and balance the flavors.
- You can substitute one for the other, but it requires adjustments to the recipe.
Now that you know the difference, you’ll never have to wonder why your cookies didn’t rise or why your muffins turned out flat. Happy baking!
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