5 Substitutes for Cream of Tartar (by What It Is Actually Doing)

Cream of tartar is one of those ingredients that lives at the back of the cupboard for years — until a recipe suddenly demands it and you discover the tin is empty. The good news: you almost certainly have a substitute on hand already, and in a lot of recipes you can leave it out entirely.

The trick is knowing which job it is doing. Cream of tartar (a powdered acid, potassium bitartrate, left over from winemaking) shows up in three very different roles: stabilizing whipped egg whites, teaming up with baking soda to leaven, and keeping sugar from crystallizing in candy and frosting. The right swap depends entirely on which of those you need.

Here is exactly what to reach for in each case, with ratios — plus the recipes where you can skip it and lose almost nothing.

The Quick List

• Lemon juice or white vinegar — for stabilizing egg whites; about 1/2 teaspoon per egg white
• Baking powder — when the recipe pairs cream of tartar with baking soda to leaven
• Buttermilk or yogurt — another acid source for leavening bakes (with a liquid adjustment)
• A squeeze of lemon juice — to stop sugar crystallizing in syrups and frostings
• Nothing at all — many cookies and meringues survive just fine without it

For Stabilizing Egg Whites (Meringue, Souffle, Angel Food Cake)

This is the job cream of tartar is most famous for. A small amount of acid lowers the pH of egg whites, which helps the foam whip higher and hold its shape without weeping or collapsing. Any mild acid does the same thing.

Lemon Juice or White Vinegar

• Swap: About 1/4 to 1/2 teaspoon lemon juice or white vinegar per egg white (start at the lower end)
• Best for: Meringues, souffles, angel food cake, whipped egg-white frostings
• Skip it for: Nothing, really — this is a reliable one-for-one job; just watch strong lemon flavor in delicate meringues

Both work by the same acid mechanism, so use whichever you have. White vinegar is the safer pick for flavor because it cooks off and disappears, while lemon juice can leave a faint citrus note — usually welcome, but worth noting in a plain vanilla meringue. Add the acid once the whites are foamy and just starting to hold, the same point at which you would sprinkle in cream of tartar. As King Arthur Baking puts it, cream of tartar here is really "baking insurance" — helpful for consistency, not strictly mandatory (more on skipping it below).

For Leavening (When the Recipe Also Has Baking Soda)

Cream of tartar has no rising power on its own — it is the acid half of a leavening pair. When a recipe lists both cream of tartar and baking soda, those two together are essentially homemade baking powder. So the cleanest fix is to replace the pair with the real thing.

Baking Powder

• Swap: Replace every 1/4 teaspoon baking soda plus 1/2 teaspoon cream of tartar with 1 teaspoon baking powder
• Best for: Cookies, biscuits, quick breads, and cakes that use the soda-plus-tartar combo
• Skip it for: Recipes where cream of tartar is not paired with baking soda (it is doing a different job there)

Because baking powder already contains baking soda and a dried acid, swapping the pair out for it keeps the chemistry balanced. Per Healthline, you can also think of it as 1.5 teaspoons of baking powder to replace 1 teaspoon of cream of tartar, as long as the recipe contains both. If you have cream of tartar but no baking powder, the trick works in reverse — our baking powder substitutes guide shows how to build it from baking soda and cream of tartar, and the baking soda guide covers the flip side.

Buttermilk or Yogurt

• Swap: For each 1/4 teaspoon cream of tartar, remove 1/2 cup liquid from the recipe and add 1/2 cup buttermilk (or milk-thinned plain yogurt) in its place; keep the baking soda
• Best for: Pancakes, quick breads, and cakes that already have some liquid to trade
• Skip it for: Dry doughs with no liquid to swap out, or egg-white recipes

Buttermilk and yogurt are acidic enough to activate baking soda, so they can stand in for cream of tartar's acid role while adding a pleasant tang and tender crumb. Because you are adding liquid, pull an equal amount of other liquid out to keep the batter balanced. This is a natural fit for pancakes and soda breads; it is not an option when the recipe has nothing wet to remove.

For Preventing Sugar Crystallization (Candy, Icing, Syrups)

In caramel, hard candy, royal icing, and boiled frostings, a pinch of cream of tartar keeps sugar smooth by discouraging it from forming grainy crystals. A little acid does the same thing.

Lemon Juice (or Corn Syrup)

• Swap: About 1/2 teaspoon lemon juice per cup of sugar; or stir in a tablespoon of corn syrup or glucose
• Best for: Caramel, hard candy, boiled icings, and syrups you want to stay smooth
• Skip it for: Nothing critical — but taste as you go so lemon does not shift the flavor

A squeeze of lemon juice adds just enough acid to interrupt crystal formation, which is exactly why so many caramel recipes call for it directly. Corn syrup (or glucose syrup) works differently but toward the same end: it physically gets in the way of crystals forming. For most home candy and frosting, the lemon route is simplest and uses what you already have.

When to Just Leave It Out

Here is the part most panic-searchers are relieved to learn: in plenty of recipes, cream of tartar is optional. Classic snickerdoodles use it for their signature tang and slightly chewy, crackly texture — leave it out and you still get a perfectly good cookie, just a touch less tangy and a little more like a plain sugar cookie. Egg whites will whip to stiff peaks without any acid at all; the meringue is simply a bit less foolproof and more prone to weeping if it sits, so whip it fully and use it promptly. And syrups made without cream of tartar are fine to eat right away — they may crystallize only if stored a long time, and a gentle reheat smooths them back out.

The one place not to skip the acid without a plan is a recipe leaning on the cream-of-tartar-plus-baking-soda pair to rise. There, dropping the cream of tartar means dropping half your leavening — use the baking powder swap above instead.

Not sure which role cream of tartar is playing in the specific recipe in front of you, or how much the swap will change the result? That is exactly what the Eat Well Planner AI recipe chat is for. Pull up your actual recipe, ask what to use instead of cream of tartar, and it reads the full ingredient list to tell you which substitute fits and what to adjust — a real answer for your dish, not general guidance. If you need to adapt the whole recipe (say, to make it dairy-free before swapping in yogurt), it can rewrite the recipe with the changes worked in.

What Not to Use

• Cream of tartar alone as a leavener. It has no rising power by itself — it needs baking soda. If a recipe has cream of tartar but no baking soda, it is there to stabilize or prevent crystals, not to leaven.
• Baking soda by itself in place of cream of tartar. Soda is alkaline; cream of tartar is acidic. Swapping one for the other throws off both the chemistry and the flavor.
• A heavy hand with lemon or vinegar. More acid does not mean more stability past a point, and too much adds sourness. Stick close to the ratios above.

The Bottom Line

For whipped egg whites, a splash of lemon juice or white vinegar does the job. For leavening, swap the cream-of-tartar-and-baking-soda pair for baking powder, or lean on buttermilk. For smooth candy and icing, a squeeze of lemon covers it. And in a surprising number of recipes, you can simply leave it out and carry on.

When you are not sure how a swap will land in your recipe, that is where Eat Well Planner earns its keep — import any recipe, ask the AI chat what to use instead and what to change, and get an answer that accounts for everything else in the bowl. It is the same tool that organizes your recipes, plans your week, and writes the shopping list, so the next time an obscure ingredient runs out mid-bake, you are never stuck.