Quick answer
Use lemon juice or plain white vinegar for meringue, and use twice as much liquid acid as cream of tartar. That means 2 teaspoons lemon juice or vinegar for 1 teaspoon cream of tartar. In cookies and cakes, a liquid acid can upset the dough or batter, so replace the cream of tartar and baking soda together with baking powder only when a published recipe gives that conversion. For sugar syrup or candy, follow the recipe's acid or corn syrup amount instead of making a volume-for-volume swap.
Before you swap
Check why the recipe uses cream of tartar. Egg whites need a stabilizing acid, cookie dough may need a dry acid to react with baking soda, and candy needs careful control of crystallization. Match the replacement to that job rather than choosing one substitute for every recipe.
Choose the substitute by the job it does
Cream of tartar is potassium bitartrate, an acidic powder. It can stabilize beaten egg whites, react with baking soda, add the familiar tang to snickerdoodles, or help control sugar crystallization. A substitute that works for one job may fail at another.
| Recipe | Best substitute | Working ratio | What changes |
|---|---|---|---|
| Meringue, pavlova, angel food cake | Lemon juice or plain white vinegar | 2 teaspoons liquid acid for 1 teaspoon cream of tartar | The foam can be a little less firm and may soften sooner. |
| Cookies or cake with baking soda | Baking powder, if the recipe supports it | Replace both the cream of tartar and baking soda using a published conversion | Rise, spread, browning, and flavor may change. |
| Classic snickerdoodles | Baking powder | For King Arthur's formula, replace 2 teaspoons cream of tartar plus 1 teaspoon baking soda with 2 teaspoons baking powder | The cookies lose some of their characteristic tang. |
| Clear sugar syrup or noncrystalline candy | Lemon juice or corn syrup | Use the amount stated in a reliable syrup or candy recipe | Too much acid or corn syrup can change flavor and texture. |
The general lemon juice ratio comes from University of Illinois Extension. The source notes that lemon juice can replace cream of tartar at 2 teaspoons for every 1 teaspoon, while warning that the finished meringue or cookie may not behave exactly the same.
For meringue and whipped egg whites
Lemon juice is the most practical substitute for cream of tartar in meringue. Plain distilled white vinegar works too. Both lower the egg whites' pH, which helps the foam stay together as it is whipped.
Use 1/2 teaspoon lemon juice or white vinegar for every 1/4 teaspoon cream of tartar. If the recipe gives the stabilizer per egg white, King Arthur Baking advises starting with 1/8 to 1/4 teaspoon lemon juice or vinegar per egg white when the original calls for a pinch to 1/8 teaspoon cream of tartar.
Add the lemon juice or vinegar when the whites look foamy, then continue with the recipe. Use a clean bowl and whisk because grease can keep egg whites from reaching their full volume.
Expect a small texture difference. In King Arthur's controlled meringue comparison, lemon juice and vinegar made acceptable, glossy meringues, but cream of tartar produced the firmest peaks and stayed crisp longer. That published comparison is the basis for this caution; CookBuddyGuide did not run a separate test.
A copper bowl can also stabilize egg whites, but it is equipment rather than a measured ingredient swap. Baking powder, cornstarch, and baking soda alone do not replace cream of tartar in meringue.
For cookies, cakes, and quick batters
Check whether the ingredient list also contains baking soda. If it does, the cream of tartar is probably supplying the acid needed for leavening. Swapping in lemon juice or vinegar changes both acidity and moisture, which can affect cookie spread or cake structure.
The safer route is to replace the cream of tartar and baking soda together with a measured amount of baking powder from a published recipe. Baking powder already contains baking soda and one or more dry acids, but formulas vary. That is why a single universal conversion is less reliable than a recipe-specific one.
If you are adjusting a recipe without a published conversion, consider using a version already written for baking powder. The guides to baking powder substitutes and checking baking powder freshness can help before you start.
Do not replace cream of tartar with baking soda alone. Baking soda is alkaline. Without enough acid in the recipe, it can leave an unpleasant taste and change browning and spread.
For snickerdoodles
Cream of tartar does two jobs in a classic snickerdoodle: it reacts with baking soda and contributes a slight tang. Baking powder can replace the leavening pair, but it does not reproduce that flavor exactly.
King Arthur's snickerdoodle recipe provides a clear conversion for its own formula: replace 2 teaspoons cream of tartar plus 1 teaspoon baking soda with 2 teaspoons baking powder total. Do not use 3 teaspoons baking powder. For another snickerdoodle recipe with different quantities, use its stated alternative or choose a recipe designed without cream of tartar.
Adding lemon juice to an existing cookie formula is less predictable because the extra water can change dough consistency. If the characteristic tang matters, buying cream of tartar is the closest route. If the immediate goal is a cinnamon sugar cookie with reliable lift, a baking powder version from a reputable recipe source is a reasonable choice.
For sugar syrup, caramel, and candy
Cream of tartar can help limit unwanted sugar crystals by encouraging some sucrose to break into glucose and fructose. Lemon juice can provide acid for the same purpose. Corn syrup works differently by adding other sugar molecules that interfere with crystal formation.
The Exploratorium's sugar science guide explains both methods. It does not support one fixed replacement amount for every syrup or candy. The right quantity depends on the sugar concentration, cooking temperature, and whether the finished candy should be crystalline or smooth.
Use a reliable recipe that already specifies lemon juice, cream of tartar, or corn syrup. Do not replace a teaspoon of cream of tartar with a teaspoon of corn syrup and assume the result will match. Candy ratios are sensitive, and too much interfering sugar or acid can leave a product soft or sticky.
What not to use
- Cornstarch: It thickens liquids but does not supply the acid needed for egg foam, baking soda, or sugar inversion.
- Baking soda alone: It removes the acid side of the reaction and can leave an alkaline taste.
- Baking powder in egg whites: It is a leavener for batters and doughs, not a meringue stabilizer.
- Flavored or dark vinegar: It may add color or a strong flavor. Plain white vinegar is the more neutral choice.
- A guessed dairy swap: Buttermilk and yogurt bring substantial liquid. Use them only in a formula written for that substitution.
Frequently asked questions
How much lemon juice replaces cream of tartar?
Use 2 teaspoons of lemon juice for each 1 teaspoon of cream of tartar. For meringue, start with the recipe's amount or use 1/8 to 1/4 teaspoon lemon juice per egg white when the original calls for a pinch to 1/8 teaspoon cream of tartar.
Can baking powder replace cream of tartar?
Only when cream of tartar is paired with baking soda for leavening. Replace both ingredients together, following a published recipe conversion. Do not add baking powder to meringue or sugar syrup.
Can I leave cream of tartar out?
Sometimes, but the result changes. Egg whites can whip without it, although the foam is less stable. Cookies may lose tang, spread differently, or rise less if the cream of tartar was meant to react with baking soda.
Can cornstarch replace cream of tartar?
No. Cornstarch is a thickener, not an acid. It cannot replace cream of tartar for stabilizing egg whites, reacting with baking soda, or helping control sugar crystallization.
Sources
- University of Illinois Extension: Cream of tartar, from winery byproduct to baking essential
- King Arthur Baking: What is cream of tartar?
- King Arthur Baking: Meringue stabilizer comparison
- King Arthur Baking: Snickerdoodle cookies
- Exploratorium: The science of sugar and crystallization
