✔ Updated · side-by-side table, substitution ratios and a freshness test
Baking soda and baking powder both make bakes rise, but they aren't interchangeable, and mixing them up is how I once made very flat, very bitter muffins. Here's the simple difference.
No, they are not the same. Baking soda (bicarbonate of soda) is pure sodium bicarbonate and needs an acid such as buttermilk, yogurt or lemon juice to release gas. Baking powder is baking soda already mixed with a dry acid and cornstarch, so it only needs liquid and heat. Baking soda is about three times stronger.
- Baking soda: needs acid in the recipe; browns and spreads more.
- Baking powder: self-contained; most is double-acting (rises when wet, again when hot).
- Swap soda for powder: 1/4 tsp soda + 1/2 tsp cream of tartar = 1 tsp powder.
- Bicarbonate of soda is simply the UK name for baking soda.
Baking Soda vs Baking Powder at a Glance
| Baking soda | Baking powder | |
|---|---|---|
| What it is | Pure sodium bicarbonate | Baking soda + dry acid + cornstarch |
| Needs acid in the recipe? | Yes | No |
| When it reacts | Immediately when wet with acid | Mostly double-acting: when wet, and again in the oven |
| Strength | About 3 to 4 times stronger | Milder; used in larger amounts |
| Typical amount | About 1/4 tsp per cup of flour | About 1 to 1 1/4 tsp per cup of flour |
| Effect on texture | More browning and spread | Tall, light, even rise |
| Used in | Buttermilk pancakes, cookies, banana bread | Biscuits, cakes, muffins, plain-milk pancakes |
| Other names | Bicarbonate of soda, bicarb | Single- or double-acting baking powder |
When to Use Baking Soda
Reach for baking soda when the recipe already has an acid: buttermilk, yogurt, sour cream, brown sugar, molasses, honey, lemon juice, vinegar or natural cocoa. The soda neutralizes the acid and releases carbon dioxide for lift.
It also boosts browning and spread, which is why chewy cookies often use soda. Bake soon after mixing, because the reaction starts right away.
When to Use Baking Powder
Use baking powder when there's little or no acid in the batter, like a vanilla cake or biscuits made with regular milk. Because it carries its own acid, it gives a clean-tasting, even rise.
Double-acting powder gives you a little time: some gas forms when it gets wet and the rest in the oven.
Why Some Recipes Use Both
Recipes with an acidic ingredient often use a little soda to neutralize the acid and add browning, plus baking powder for extra lift. Buttermilk pancakes and many banana breads work this way.
Can You Substitute One for the Other?
- No baking powder? For each 1 teaspoon, mix 1/4 teaspoon baking soda with 1/2 teaspoon cream of tartar. Or use 1/4 teaspoon soda and swap 1/2 cup of the milk for buttermilk or yogurt.
- No baking soda? Use about 3 times as much baking powder (1 teaspoon soda becomes 1 tablespoon powder). Expect a slightly different taste and less browning; it works best in small amounts.
- Never swap 1 for 1. Too much soda tastes soapy and metallic, and too little powder gives flat, dense bakes.
How to Test If They’re Still Good
My quick freshness test: stir 1/2 teaspoon of baking powder into 1/4 cup hot water, or a pinch of baking soda into a spoonful of vinegar. Strong fizzing means it's good; weak bubbles mean it's time for a new tin.
Opened baking powder usually stays reliable for about 6 to 12 months. Keep both tightly closed in a cool, dry cupboard and write the opening date on the lid.
Put Them to Work
See both in action in my IHOP buttermilk pancakes and copycat lemon loaf. If your pancakes still come out heavy, read why pancakes turn out dense.
Frequently Asked Questions
Are baking powder and baking soda the same thing?
No. Baking soda is pure sodium bicarbonate and needs an acid to work. Baking powder contains baking soda plus a dry acid and cornstarch, so it works with just liquid and heat. They can't be swapped one for one.
Is bicarbonate of soda the same as baking powder?
No. Bicarbonate of soda is the UK name for baking soda. Baking powder is a blend that contains bicarbonate of soda along with an acid, so it's milder and doesn't need acidic ingredients.
What happens if I use baking soda instead of baking powder?
Without enough acid, the soda won't fully react. Your bake may rise poorly, brown too much and taste soapy or metallic. If you must swap, use about one third as much soda and add an acid such as cream of tartar.
Can I use baking powder instead of baking soda?
Yes, in a pinch. Use roughly 3 times as much baking powder. The texture and color will be slightly different, and it works best in recipes that only call for a small amount of soda.
How long do baking powder and baking soda last?
Unopened, both last well past their dates if kept dry. Once opened, baking powder is most reliable for about 6 to 12 months. Test either one with hot water or vinegar before an important bake.
