The best substitutes for cream of tartar depend on what you're making

Cream of tartar stabilizes egg whites, prevents sugar crystallization, and adds lift to baked goods. If you don't have it, your substitute depends on the job. For whipped egg whites, lemon juice or white vinegar work directly. For baking, baking soda mixed with an acid (lemon juice, vinegar, or buttermilk) replaces the chemical reaction cream of tartar provides. For preventing rock candy or fudge from crystallizing, you can skip it entirely or use corn syrup instead.

The reason substitutes work is that cream of tartar is an acid — a byproduct of winemaking that stabilizes and tenderizes. Most replacements are acids too, or they're ingredients that do the same chemical job in a different way.

Key Takeaways

  • Lemon juice or white vinegar replaces cream of tartar one-to-one when whipping egg whites, because both are acids that stabilize the foam.
  • For baking recipes that pair cream of tartar with baking soda, use baking powder instead — it contains both ingredients already mixed.
  • Buttermilk, yogurt, or sour cream can replace cream of tartar in recipes that already call for baking soda, because they provide the acid needed for the reaction.
  • For candy and fudge, corn syrup prevents crystallization without changing flavor, though you can often omit cream of tartar entirely if you stir carefully.
  • Potassium bitartrate (the chemical name for cream of tartar) has no single perfect substitute — the right choice depends on what the recipe needs it to do.

Lemon juice and vinegar for whipped egg whites

When a recipe calls for cream of tartar to stabilize whipped egg whites, use lemon juice or white vinegar at a ratio of 1/8 teaspoon per egg white. This is the most direct swap. Both are acids that break down the proteins in egg whites the same way cream of tartar does, creating a foam that holds its shape longer and peaks higher.

Lemon juice is milder and won't change the flavor of meringues or angel food cake. White vinegar is stronger and slightly more effective at stabilizing, but it can leave a faint vinegar taste if you use too much. Distilled white vinegar works better than apple cider or wine vinegar, which have their own flavors.

The foam won't be quite as stable as it would be with cream of tartar — it may deflate slightly faster — but for most home baking, the difference is small enough that you won't notice it in the final cake or pie.

Baking powder as a one-ingredient replacement in baked goods

Many baking recipes pair cream of tartar with baking soda. If your recipe calls for both, you can replace them with baking powder alone. Baking powder already contains cream of tartar (or another acid) mixed with baking soda, so you're getting the same chemical reaction in one ingredient.

Use three times as much baking powder as the amount of baking soda the recipe called for. For example, if the recipe says 1/4 teaspoon baking soda plus 1/4 teaspoon cream of tartar, use 3/4 teaspoon baking powder instead. This works because baking powder is roughly one part acid to two parts baking soda by weight.

This swap works for cookies, cakes, quick breads, and biscuits. It does not work for recipes that use baking soda alone without cream of tartar — those recipes rely on baking soda reacting with an acidic ingredient already in the batter (like buttermilk or chocolate), and adding baking powder would create too much lift.

Buttermilk, yogurt, or sour cream when baking soda is already in the recipe

If your recipe calls for baking soda and cream of tartar separately, you can also replace the cream of tartar by swapping out a liquid ingredient. Use buttermilk, plain yogurt, or sour cream in place of regular milk or water. These are acidic enough to react with baking soda the way cream of tartar does.

Substitute them one-to-one for the liquid the recipe calls for. If the recipe says 1 cup milk, use 1 cup buttermilk. You may need to thin yogurt or sour cream slightly with water to match the original liquid's thickness. This method works well for pancakes, waffles, biscuits, and soda breads.

The trade-off is that these ingredients add their own flavor — buttermilk adds tang, yogurt adds slight sourness, and sour cream adds richness. This is usually a benefit, but it changes the final taste slightly. If you want a neutral result, lemon juice or vinegar mixed into regular milk is a better choice.

Corn syrup for preventing crystallization in candy and fudge

Cream of tartar prevents sugar from crystallizing in candy, fudge, and rock candy by interfering with crystal formation. Corn syrup does the same job. Use 1 tablespoon of corn syrup for every 1 cup of sugar in the recipe.

Light corn syrup is neutral in flavor and won't change the taste of your candy. Dark corn syrup has a molasses flavor that works in some candies but not others. Honey and agave syrup also work, but they add their own flavors more noticeably than corn syrup does.

In many candy recipes, you can actually omit cream of tartar or its substitute entirely if you stir the mixture carefully and avoid scraping the sides of the pan with a spoon — both actions can trigger crystallization. If you're making fudge or divinity, though, using a substitute is safer because these recipes are more prone to graining.

Potassium bitartrate (cream of tartar's chemical form) as a direct replacement

If you have access to a specialty baking supplier or online retailer, you can order potassium bitartrate — the chemical name for cream of tartar — and use it as a direct one-to-one swap. It is the same ingredient, just sold under its scientific name instead of its common one.

This is useful if you bake frequently and want to avoid substitution math. It costs more than cream of tartar bought in a grocery store spice aisle, so it makes sense only if your local store is out of stock or if you need it in bulk.

When you can skip cream of tartar entirely

Not every recipe actually needs cream of tartar. If it's listed as optional or if you're making a recipe that doesn't rely on its chemical properties, you can often leave it out without a noticeable change.

Recipes where cream of tartar is truly optional include some cookie doughs (where it adds slight tang but isn't essential), some spice cake recipes, and some homemade playdough formulas. Recipes where it matters are those that whip egg whites, those that pair it with baking soda for lift, and those that need to prevent crystallization in sugar work.

If you're unsure whether a recipe needs it, check whether the recipe would still rise without it. If the recipe relies on whipped egg whites or on a chemical reaction between baking soda and an acid, you need a substitute. If it's just listed in the ingredients without a specific chemical role, you can probably skip it.

Frequently Asked Questions

Can I use baking powder instead of cream of tartar in meringue?

No. Meringue needs an acid to stabilize the egg whites, and baking powder contains baking soda, which is a base — it works against what you're trying to do. Use lemon juice or white vinegar instead. Baking powder works only in recipes where cream of tartar is paired with baking soda.

Does the amount of substitute change if I use lemon juice instead of vinegar?

No, the ratio stays the same: 1/8 teaspoon per egg white. Lemon juice is slightly milder, so some bakers use a tiny bit more, but the difference is small. Start with equal amounts and adjust if you notice the foam isn't holding as well as you'd like.

What if my recipe calls for cream of tartar but not baking soda?

Check what the recipe is making. If it's meringue, angel food cake, or whipped egg whites, use lemon juice or vinegar. If it's candy or fudge, use corn syrup. If you're unsure what role cream of tartar plays, look at the recipe instructions — if it mentions whipping eggs or preventing crystallization, that tells you which substitute to use.

Is there a substitute that works for everything cream of tartar does?

No. Cream of tartar is an acid with specific chemical properties, and different recipes need it for different reasons. Lemon juice works for egg whites, baking powder works for baked goods with baking soda, and corn syrup works for candy. Using the right substitute for the job gives better results than trying to use one substitute everywhere.