How To Tell If Baking Powder Is Still Good

Baking powder is a staple ingredient in many baked goods like cakes, cookies, muffins, and more. It helps batters and doughs rise by producing carbon dioxide gas. But like most baking ingredients, baking powder has a shelf life and loses its effectiveness over time.

How To Tell If Baking Powder Is Still Good

So how can you tell if the baking powder in your pantry is still fresh and usable? We covered everything you need to know about testing baking powder and determining if it's still potent.

What Is Baking Powder and How Does It Work?

Baking powder is a dry chemical leavening agent that is used to make baked goods light and fluffy. It is composed of baking soda (sodium bicarbonate), cream of tartar (acid), and cornstarch.

When baking powder is mixed into a batter or dough, the baking soda and acid react together to produce carbon dioxide bubbles. These bubbles expand when heated in the oven, causing the batter to rise.

So in order for baking powder to work properly, it relies on a chemical reaction. If the baking powder is old and no longer potent, it will fail to produce enough bubbles and cause baked goods to be dense and flat.

Key Takeaway: Baking powder causes batters and doughs to rise through a chemical reaction that produces carbon dioxide bubbles. Old, ineffective baking powder will not create enough bubbles for proper rising.

How Long Does Baking Powder Last?

The shelf life of baking powder depends largely on how it is stored:

  • Unopened baking powder typically lasts 12-18 months from the manufacturing date.
  • Once opened, baking powder lasts approximately 6 months before losing potency.

However, even if stored properly, baking powder will eventually expire and become less effective over time. Factors like humidity, heat, and air exposure can accelerate the decline in freshness.

So you shouldn't rely on the expiration date on the packaging as an absolute guide. It's better to test baking powder periodically to ensure it still has rising power.

How to Test if Baking Powder is Still Active

Testing baking powder to see if it's still potent is simple:

What You'll Need:

  • 1/2 teaspoon baking powder
  • 1/4 cup warm water


  1. Place the warm water in a small bowl or cup. Hot tap water works fine, no need to boil.
  2. Add 1/2 tsp of baking powder and stir briefly to dissolve.
  3. Look for an immediate bubbling or foaming reaction. Active baking powder will vigorously bubble and foam up.
  4. If it barely bubbles or there is no reaction, the baking powder has lost its effectiveness and should be discarded.
Baking Powder Test ResultsMeaning
Vigorous bubbling and foamingFresh and active - OK to use
Weak reaction with minimal bubblesExpired - Discard and buy new baking powder

The baking powder test takes just a minute and gives you a clear answer about whether or not it's still potent for baking.

If your baking powder fails the test, do not use it. Inactive baking powder will prevent your baked goods from rising properly.

Key Takeaway: Test baking powder by adding 1/2 tsp to 1/4 cup warm water. Look for vigorous bubbling. Weak or no reaction means it's expired and should be discarded

How to Store Baking Powder for Maximum Freshness

To prolong the shelf life of baking powder:

  • Store in a cool, dry place away from heat and light. An airtight container in the pantry or kitchen cupboard is ideal.
  • Keep the container sealed tightly to minimize air exposure. Transfer powder to an airtight container if the original packaging is not resealable.
  • Write the date opened on the container with a marker. Check freshness and test after 3-4 months.
  • Buy small quantities and avoid stockpiling large containers if you only bake occasionally. Or consider sharing with a friend.

Proper storage helps delay the decline in baking powder's potency. But it's still important to test periodically after opening.

What Happens If Your Baking Powder Is Expired?

Using an expired or inert baking powder that fails the bubble test will prevent baked goods from rising properly. You'll end up with dense, heavy results.

For example, cakes will turn out flat with poor structure instead of light and fluffy. Cookies will spread too thin and muffins won't rise. Pancakes will also turn out flat and dense.

Don't take chances with old baking powder. Always test first or simply replace if in doubt. Baking powder is inexpensive and it's better to be safe than ruin a recipe.

Substitutes for Baking Powder

If you don't have any fresh baking powder on hand, there are a couple of options:

Baking Soda + Acid

1 teaspoon baking powder = 1/4 teaspoon baking soda + 1/2 teaspoon cream of tartar or lemon juice.

The acid activates the baking soda, causing a similar rising reaction. Note that too much baking soda can give a metallic taste.

Double-Acting Baking Powder Recipe

2 parts Cream of Tartar

1 part Baking Soda

1 part Cornstarch

Combine ingredients thoroughly and store them in an airtight container. Use the same volume that the recipe calls for in baking powder.

Be aware that homemade baking powder is single-acting, meaning it will not rise again in the oven. Get baked goods in the oven quickly after mixing.


Does the brand of baking powder matter?

There is little difference between brands in performance. However, some types like aluminum-free baking powder claim to have better flavor. Popular options include Rumford, Bob's Red Mill, and Clabber Girl brands.

How much baking powder per cup of flour?

The general rule of thumb is 1 teaspoon baking powder per 1 cup of flour. Reduce to 3/4 teaspoon if using self-rising flour.

Is baking powder the same as baking soda?

No. Baking soda is pure sodium bicarbonate and requires an acid ingredient like lemon juice to activate it. Baking powder already contains acid. Do not use baking soda when a recipe calls for baking powder.

Does baking powder really expire?

Yes. While baking powder doesn't spoil, it does lose potency over time. Always test old or expired baking powder before using it to ensure it still has rising power.

Can expired baking powder make you sick?

No, it is generally safe to ingest and won't make you sick if expired or inert. However, it may not be as effective as a leavening agent.


Knowing how to test baking powder freshness is an important skill for bakers. This simple test allows you to quickly determine if your baking powder is still potent or needs to be replaced.

Be sure to check baking powder periodically and follow proper storage guidelines to maximize its shelf life. Discard expired baking powder that fails the test to avoid flat baked goods.

With fresh, active baking powder you can continue creating light, fluffy treats your friends and family will love.

Sarah Cortez
Sarah Cortez

My name is Sarah and I'm a baker who loves trying out new recipes and flavor combinations. I decided to challenge myself to use a new spice or ingredient powder in my baking each week for a year. Some successes were the cardamom sugar cookies, vivid turmeric cake, and beetroot chocolate cupcakes. Failures included the bitter neem brownies and overwhelmingly hot ghost pepper snickerdoodles. Through this experience I've discovered amazing additions to spice up desserts while learning how to balance strong flavors. Follow my journey as I push the boundaries of baking with unique powders!

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