The Best Substitutes for Cream of Tartar

Cream of tartar works in baking by stabilizing egg whites, adding lift to cakes, and preventing sugar crystallization in frostings and candies. If you don't have it on hand, the best replacement depends on what you're making. For whipped egg whites, use lemon juice or white vinegar at half the amount called for. For cakes and quick breads, baking soda mixed with an acid works, though the ratio matters. For candy and frosting, you have fewer options—some substitutes work better than others.

The reason cream of tartar works so well is that it's an acid that reacts with baking soda or stabilizes proteins in eggs. Any substitute you choose needs to do one of those two jobs. That's why a straight swap rarely works—you need to match both the chemical function and the amount.

Key Takeaways

  • Lemon juice or white vinegar at half the cream of tartar amount is the best choice for whipping egg whites into meringue or mousse.
  • For cakes and quick breads, mix baking soda with lemon juice or vinegar in a small bowl first, then add both to your batter.
  • Baking powder alone cannot fully replace cream of tartar because it already contains an acid and won't give you the same control.
  • For candy, frostings, and fondant, cornstarch or arrowroot powder can prevent crystallization, though results may differ slightly from cream of tartar.
  • Always measure substitutes carefully—using too much acid can make baked goods taste sour or cause them to rise too quickly and collapse.

Lemon Juice and Vinegar for Egg Whites

When you're making meringue, angel food cake, or whipped cream, lemon juice or white vinegar is your closest match. Use half the amount of cream of tartar the recipe calls for. If a recipe asks for 1/4 teaspoon of cream of tartar, use 1/8 teaspoon of lemon juice or vinegar instead.

The acid in both lemon juice and vinegar stabilizes the proteins in egg whites the same way cream of tartar does, helping them hold stiff peaks longer. Lemon juice is milder in flavor, so it's the better choice if you're making a delicate dessert. White vinegar has almost no taste once baked, making it ideal for cakes where you don't want any tang. Avoid apple cider vinegar or flavored vinegars—they'll change the taste of your finished dish.

Add the lemon juice or vinegar to your egg whites at the same time you would add the cream of tartar. The eggs will whip up just as quickly, and the foam will be just as stable. This substitution works for any recipe where cream of tartar's only job is to stabilize eggs.

Baking Soda and Acid for Cakes and Quick Breads

In cakes, muffins, and biscuits, cream of tartar pairs with baking soda to create lift. You can replicate this by mixing baking soda with an acid yourself. The most reliable acids are lemon juice, white vinegar, or buttermilk.

The ratio is roughly 1/4 teaspoon of baking soda to 1/2 teaspoon of lemon juice or vinegar. Mix them together in a small bowl and let them sit for 30 seconds—you'll see them bubble slightly. Then add this mixture to your batter along with any other dry ingredients. If your recipe calls for 1/2 teaspoon of cream of tartar and 1/4 teaspoon of baking soda, use 1/4 teaspoon of baking soda mixed with 1/2 teaspoon of lemon juice or vinegar instead.

The timing matters here. Once you mix the acid and baking soda, the reaction starts when ready. You have about 15 to 20 minutes before the lift is spent, so add this mixture to your batter right away and get it into the oven. If you wait too long, your cake or muffins will rise less and may be dense.

Baking Powder as a Partial Replacement

Baking powder contains baking soda plus an acid already mixed in, so it might seem like a direct swap. It's not, because you lose control over the acid-to-base ratio. Baking powder works best in recipes that don't already have acidic ingredients like buttermilk or yogurt.

If you must use baking powder, replace 1/2 teaspoon of cream of tartar plus 1/4 teaspoon of baking soda with about 1/2 teaspoon of baking powder. Your baked good will still rise, but it may taste slightly metallic or bitter because baking powder often contains aluminum compounds. The texture might also be a bit different—slightly less tender than if you'd used cream of tartar.

Baking powder is a last resort, not a first choice. Use it only if you have no lemon juice, vinegar, or buttermilk on hand. For the best results, stick with the baking soda and acid method.

Cornstarch and Arrowroot for Candy and Frosting

In candy, fudge, and frosting, cream of tartar prevents sugar from crystallizing and turning grainy. Cornstarch or arrowroot powder can do this job, though neither is a perfect match. Use the same amount as the recipe calls for cream of tartar.

Cornstarch is easier to find and less expensive. It works by absorbing moisture and interfering with sugar crystal formation. Arrowroot powder does the same thing but dissolves more smoothly into liquids, so it won't leave a cloudy appearance in clear frostings or glazes. Both are neutral in flavor and won't change the taste of your candy or frosting.

The main drawback is that cornstarch and arrowroot don't work quite as well as cream of tartar at preventing crystallization. Your frosting or candy may still develop a slightly grainy texture over time, especially if it sits for several days. If you're making something you plan to eat within a day or two, this substitution works fine. For longer storage, cream of tartar is still the better choice.

When to Use Potassium Bitartrate

Cream of tartar is actually potassium bitartrate, a byproduct of winemaking. If you're a serious baker or candy maker, you can order pure potassium bitartrate online and use it exactly as you would cream of tartar. It's the same ingredient, just sold under a different name.

This option makes sense only if you use cream of tartar regularly and want to avoid running out. For a one-time recipe, it's not worth the shipping cost. But if you bake meringues or make candy several times a month, keeping potassium bitartrate on hand means you'll never need a substitute again.

Common Mistakes to Avoid

The biggest mistake is using too much of a substitute. Lemon juice and vinegar are strong acids—doubling the amount will make your baked goods taste sour and may cause them to rise too fast and collapse in the oven. Measure carefully and stick to the half-amount rule for egg whites.

Another common error is forgetting to mix baking soda with the acid before adding it to your batter. If you add them separately, the reaction happens unevenly and your cake won't rise properly. Always mix them together in a small bowl first, wait a few seconds for the bubbling to start, then add the mixture to your dry ingredients.

Don't assume all acids are interchangeable. Buttermilk, sour cream, and yogurt are acidic but also add moisture and fat to your recipe. If you swap lemon juice for buttermilk in a 1:1 ratio, your baked good will be too dry. Use buttermilk only if the recipe already calls for it, or reduce the amount of other liquids if you're adding it as a substitute.

Frequently Asked Questions

Can I use baking powder instead of cream of tartar and baking soda?

Baking powder can replace the combination, but not perfectly. Use about 1/2 teaspoon of baking powder for every 1/2 teaspoon of cream of tartar plus 1/4 teaspoon of baking soda. Your baked good will still rise, but the flavor and texture may be slightly different. Baking powder is best as a last resort when you have no other acids available.

What's the difference between lemon juice and vinegar as a substitute?

Both work equally well chemically. Lemon juice has a mild citrus flavor that can come through in delicate desserts, while white vinegar is nearly flavorless once baked. Choose lemon juice for recipes where you want a subtle tang, and vinegar for recipes where you want no flavor change at all.

Will my meringue be as stable if I use vinegar instead of cream of tartar?

Yes. Vinegar stabilizes egg whites just as effectively as cream of tartar because both are acids that denature the proteins. Use half the amount of cream of tartar the recipe calls for, and your meringue will hold stiff peaks for hours.

Can I use orange juice or other citrus juices as a substitute?

Orange juice and other citrus juices are less acidic than lemon juice, so they won't work as well. Stick with fresh lemon juice or white vinegar for the most reliable results. If you only have orange juice, use slightly more than you would lemon juice, but expect less stable results.

What if I'm making candy and don't have cornstarch or arrowroot?

If you have neither cornstarch nor arrowroot, you can make candy without any crystallization preventative—it will just be more likely to turn grainy. Stir the mixture less once it cools, and store it in an airtight container to keep moisture out. Some candies like fudge turn out fine without any anti-crystallization ingredient at all.