yumBaking Soda vs Baking Powder
They're both white powders, they both make baked goods rise, and they sit side by side in the pantry. But baking soda vs baking powder isn't a case of "same thing, different box". They work in different ways, and using the wrong one – or the wrong amount – can give you flat cookies or a bitter, soapy cake.
Here's what each one does, why some recipes use both, and exactly how to substitute one for the other when you run out.
Baking Soda vs Baking Powder
Baking soda is pure sodium bicarbonate. It needs an acid (like buttermilk, yogurt, lemon juice or brown sugar) to make it rise, and it's about 3–4 times stronger than baking powder. Baking powder is baking soda already mixed with a dry acid, so it only needs liquid and heat. You can swap them, but not 1:1.
- Baking sodaNeeds an acid
- Baking powderAcid built in
- StrengthSoda ≈ 3–4× stronger
- 1 tsp powder =¼ tsp soda + ½ tsp cream of tartar
In this guide
Baking Soda vs Baking Powder at a Glance
| Baking soda | Baking powder | |
|---|---|---|
| What it is | Sodium bicarbonate (a base) | Baking soda + dry acid(s) + cornstarch |
| What it needs | An acid + moisture | Moisture + heat |
| Strength | Strong – about 3–4× baking powder | Milder |
| Typical amount | About ¼ tsp per cup of flour | About 1–1¼ tsp per cup of flour |
| Effect on browning | Increases browning and spread | Less browning, more "puff" |
| Used in | Cookies, banana bread, buttermilk pancakes | Biscuits, cakes, muffins, pancakes |
| Too much tastes | Soapy or metallic | Bitter |
How Baking Soda Works
Baking soda is a base. When it meets an acid and liquid, it reacts immediately and releases carbon dioxide gas – the bubbles that make batter rise. Because the reaction starts right away, batters with baking soda should go into the oven soon after mixing.
Common acidic ingredients that activate baking soda include buttermilk, yogurt, sour cream, lemon juice, vinegar, brown sugar, honey, molasses, natural cocoa powder and applesauce.
How Baking Powder Works
Baking powder contains baking soda plus its own powdered acid, and a little cornstarch to keep it dry. Most baking powder sold today is double-acting:
- First reaction: when it gets wet in the batter
- Second reaction: when it heats up in the oven
That two-stage lift makes baking powder more forgiving – batter can sit a little longer before baking.
Why Do Some Recipes Use Both?
Many recipes, like buttermilk pancakes or chocolate cake, use both. The baking soda neutralizes the acid in the recipe (improving flavor and browning), while the baking powder provides extra, reliable lift. Using both gives better rise and balanced flavor.
How to Substitute Baking Soda and Baking Powder
Baking powder instead of baking soda
Use about 3 times as much baking powder. For 1 teaspoon of baking soda, use 3 teaspoons (1 tablespoon) of baking powder. The texture and taste may change slightly, and you may get less browning.
Baking soda instead of baking powder
You need to add an acid. For 1 teaspoon of baking powder, use:
- ¼ teaspoon baking soda + ½ teaspoon cream of tartar (best option), or
- ¼ teaspoon baking soda + ½ cup buttermilk or yogurt (reduce other liquids by ½ cup), or
- ¼ teaspoon baking soda + ½ teaspoon lemon juice or vinegar
Homemade baking powder
Mix 1 part baking soda with 2 parts cream of tartar. Add 1 part cornstarch if you want to store it. Homemade baking powder is single-acting, so bake right after mixing.
How to Test If They're Still Fresh
- Baking powder: stir ½ teaspoon into ½ cup of hot water. It should bubble right away.
- Baking soda: add ¼ teaspoon to 2 teaspoons of vinegar or lemon juice. It should fizz strongly.
- No bubbles? Replace it – old leaveners are a common cause of flat bakes.
Store both in a cool, dry place with the lid tightly closed. Once opened, they're usually at their best for about 6 months.
Common Mistakes to Avoid
- Swapping them 1:1. Fix: Use 3× baking powder for soda, or add acid to soda.
- Using too much baking soda. Soapy, metallic taste. Fix: Measure with level spoons.
- Letting baking soda batter sit. Fix: Bake soon after mixing.
- Using an open box from the fridge. It absorbs odors. Fix: Keep a separate box for baking.
- Not checking freshness. Fix: Do the bubble test.
- Clumps in the batter. Fix: Whisk leaveners into the flour first.
The Bottom Line
Baking soda needs an acid to work and is about three to four times stronger; baking powder includes its own acid and needs only moisture and heat. You can substitute one for the other – 3 teaspoons of baking powder for 1 teaspoon of soda, or ¼ teaspoon soda plus ½ teaspoon cream of tartar for 1 teaspoon of powder – but expect small changes in taste and texture.
Frequently Asked Questions
Can I use baking powder instead of baking soda?
Yes. Use about 3 times as much baking powder – 3 teaspoons for every 1 teaspoon of baking soda. Your bake may brown a little less and taste slightly different.
Can I use baking soda instead of baking powder?
Yes, if you add an acid. For 1 teaspoon of baking powder, use ¼ teaspoon of baking soda plus ½ teaspoon of cream of tartar.
What happens if you use too much baking soda?
Too much baking soda leaves a soapy or metallic taste, makes baked goods spread and brown too much, and can cause them to rise and then collapse.
Are baking soda and bicarbonate of soda the same?
Yes. Baking soda, bicarbonate of soda and bicarb soda are all names for sodium bicarbonate.
How long do baking soda and baking powder last?
Unopened, they last until the date on the package. Once opened, use them within about 6 months for the best rise, and test them with the bubble test if unsure.
About this guide
Last reviewed October 14, 2026. Substitution amounts are general guidelines; results vary slightly between recipes.
