Cream of tartar is a dry, powdery acid — potassium bitartrate — that forms as a byproduct of winemaking when tartaric acid crystallizes inside wine barrels. Despite its name, it contains no cream or dairy at all. In baking, cream of tartar serves three primary roles: it acts as the acidic component when combined with baking soda to create leavening (serving as the acid in homemade baking powder); it stabilizes whipped egg whites by making the foam more resilient and preventing overbeating; and it prevents sugar crystallization in cooked sugar applications like candy and frostings.
You might need a substitute for cream of tartar if you simply don't have it in your pantry — it's one of those ingredients many home cooks don't keep stocked. The right substitute depends entirely on which of those three roles cream of tartar is playing in your recipe.
Understanding the function is everything here: substitutes that work for activating baking soda (liquid acids like lemon juice or vinegar) are completely different from substitutes that stabilize meringue. A meringue that needs cream of tartar for stability can use lemon juice, but you'll need to adjust the quantity carefully to avoid adding too much liquid to the egg whites.
■Best Substitutes for Cream of Tartar
Choose your substitute based on whether cream of tartar is acting as a leavening acid, a meringue stabilizer, or a sugar crystallization inhibitor.
| Substitute | Flavor / Texture Match | Swap Ratio |
|---|---|---|
| Lemon Juice | Slight citrus flavor — works in most applications | 2 tsp lemon juice per 1 tsp cream of tartar |
| White Vinegar | Neutral to slightly sharp — reliable acid | 2 tsp white vinegar per 1 tsp cream of tartar |
| Apple Cider Vinegar | Mild fruit tang — good in savory and some sweet recipes | 2 tsp ACV per 1 tsp cream of tartar |
| Baking Powder (with baking soda) | Replaces the acid-base reaction entirely | 1.5 tsp baking powder replaces 1/4 tsp BS + 1/2 tsp CoT |
| Plain Yogurt (in baked goods) | Adds liquid acid — adjust recipe liquid | 1/2 cup yogurt per 1 tsp cream of tartar; reduce other liquid |
| Buttermilk (in baked goods) | Same as yogurt — mild tang | 1/2 cup buttermilk per 1 tsp cream of tartar; reduce other liquid |
■How to Choose the Right Substitute
When cream of tartar is being used as the acid component paired with baking soda for leavening — for example, in a recipe that calls for baking soda and cream of tartar but no baking powder — the simplest substitutes are liquid acids like lemon juice or white vinegar. Use about 2 teaspoons of lemon juice or vinegar for every teaspoon of cream of tartar. The extra liquid from the substitute needs to be accounted for by reducing other liquids in the recipe by the same amount. Alternatively, replace the baking soda and cream of tartar combination entirely with baking powder: 1 1/2 teaspoons of baking powder replaces the combination of 1/4 teaspoon baking soda plus 1/2 teaspoon cream of tartar.
When cream of tartar is used to stabilize meringue, you need to be more careful about how much liquid you add. Meringue (whipped egg whites) is delicate and adding too much liquid can cause it to weep or collapse. For meringue stabilization, use lemon juice at a ratio of about 1/2 teaspoon of lemon juice per egg white used in the recipe. White vinegar works similarly. Both acids lower the pH of the egg whites, which tightens the protein network and makes the foam more stable. The flavor of lemon juice is barely detectable in a fully baked meringue.
For candy-making and sugar syrups where cream of tartar prevents crystallization, lemon juice or vinegar work by the same mechanism — the acid interferes with sucrose crystallization by breaking some of the sugar molecules into glucose and fructose. Use 2 teaspoons of lemon juice per teaspoon of cream of tartar. White vinegar is preferable to other vinegars in candy applications since it's flavorless.
■Frequently Asked Questions
Can I skip cream of tartar entirely in a recipe? It depends on the recipe. If cream of tartar is the acid paired with baking soda for leavening, skipping it will result in little to no rise — definitely don't skip it without a substitute. If it's used for meringue stabilization, you can skip it but the meringue will be less stable, more likely to weep or collapse, and harder to achieve stiff peaks with. If it's used to prevent candy crystallization, skipping it may result in grainy, crystallized candy — use lemon juice or corn syrup as alternatives.
Why does cream of tartar stabilize meringue? Egg white proteins (primarily ovalbumin) form a foam when whipped, trapping air bubbles. These protein networks are fragile and can over-coagulate (tighten too much) when overbeaten, causing the foam to become dry and grainy, or can weep liquid if under-stabilized. The acid in cream of tartar lowers the pH of the egg white, which causes the proteins to denature more evenly and form a more stable, flexible foam network. It also chelates (binds) trace minerals in the egg white that can interfere with foam formation.
Does cream of tartar affect the taste of baked goods? Cream of tartar has a tart, mildly acidic flavor on its own, but at the small quantities used in most recipes (1/2 teaspoon or less), its flavor is not detectable in finished baked goods. In larger quantities — such as when it's used to stabilize a large batch of royal icing or Swiss meringue — you may notice a very faint tartness, which is generally considered pleasant.
Can I use cream of tartar to keep brown sugar soft? Some sources suggest adding cream of tartar to brown sugar to prevent it from hardening. While cream of tartar can technically help by maintaining some acidity, it's not a reliable method and is rarely recommended by professional bakers. More effective methods include storing brown sugar in an airtight container with a piece of bread or a terra cotta sugar bear that slowly releases moisture.
Is cream of tartar the same as tartaric acid? They are related but not the same. Cream of tartar (potassium bitartrate) is the potassium salt of tartaric acid. Tartaric acid itself is available as a food additive and is more potent — it's twice as acidic as cream of tartar. If substituting tartaric acid for cream of tartar, use half the amount.
See also: Food Substitutes Guide | Baking Powder Substitutes | Baking Soda Substitutes