Pick the ingredient you're missing and how much the recipe calls for. Every swap comes back as an exact mini-recipe, scaled to your amount — with the honest caveats about texture and flavour.
Best swapMilk + lemon juice or white vinegar
1 cup milk + 1 tbsp lemon juice or white vinegar
Stir and rest 5 minutes until slightly curdled.
Also worksThinned plain yogurt
¾ cup plain yogurt + ¼ cup milk
Data & method: Ratios follow standard US test-kitchen practice, cross-checked against King Arthur Baking's ingredient guides.
Every number is checked by an automated test against its source. How we calculate →
Tap ↑ Share at the bottom of Safari, then
Add to Home Screen. CrumbCalc then opens like an
app and keeps working with no signal.
Ingredient Substitutions That Actually Measure Up
Most substitution lists tell you what to swap but make you do the arithmetic when the
recipe needs 1½ cups instead of one. This baking substitutions calculator
scales the whole replacement for you — ask for 3 cups of cake flour and you get the exact
flour-and-cornstarch amounts, not a rule of thumb to multiply in your head mid-bake.
Every ratio here is the standard test-kitchen version, and each swap carries its caveat where
one exists. A milk-and-butter "heavy cream" is fine in a batter but will never whip; a flax
egg binds a muffin but cannot raise a soufflé. Knowing where a substitution breaks is as
important as knowing the ratio.
Quick reference: the most-needed swaps
Missing ingredient
Amount
Best substitute
Buttermilk
1 cup
1 cup milk + 1 tbsp lemon juice or white vinegar
Cake flour
1 cup
⅞ cup all-purpose flour + 2 tbsp cornstarch
Self-rising flour
1 cup
1 cup all-purpose flour + 1½ tsp baking powder + ¼ tsp salt
Baking powder
1 tsp
¼ tsp baking soda + ½ tsp cream of tartar
Brown sugar (light)
1 cup
1 cup granulated sugar + 1 tbsp molasses
Powdered sugar
1 cup
½ cup granulated sugar + 2 tsp cornstarch
Sour cream
1 cup
1 cup plain whole-milk yogurt
Heavy cream (for baking)
1 cup
¾ cup milk + ¼ cup melted butter
Whole milk
1 cup
½ cup evaporated milk + ½ cup water
Egg (large)
1 cup
1 tbsp ground flaxseed + 3 tbsp water
Cream of tartar (as leavening acid)
1 tsp
2 tsp lemon juice or white vinegar
Cornstarch (as thickener)
1 tbsp
2 tbsp all-purpose flour
Honey
1 cup
1¼ cups granulated sugar + ¼ cup liquid from the recipe
Vegetable oil (in baking)
1 cup
1 cup melted butter
Unsalted butter
1 cup
1 cup salted butter
Bread flour
1 cup
1 cup all-purpose flour
Vanilla extract
1 tsp
1 tsp vanilla bean paste
Working in weights instead of cups? The cups to grams converter
translates any of these amounts into grams for your scale, and the recipe scaler
resizes the whole recipe when you're changing batch size at the same time.
Every substitution, one page each
Each ingredient has a dedicated page with every option in preference order, a table scaled to
the amounts recipes actually call for, and the caveats spelled out:
For each cup of buttermilk, stir 1 tablespoon of lemon juice or white vinegar into 1 cup of milk and let it sit for 5 minutes until slightly curdled. Thinned plain yogurt (¾ cup yogurt + ¼ cup milk) also works. Both give the acidity that buttermilk recipes rely on for tenderness and leavening.
How do I make cake flour from all-purpose flour?
For each cup of cake flour, use ⅞ cup of all-purpose flour (1 cup minus 2 tablespoons) plus 2 tablespoons of cornstarch, sifted together twice. The cornstarch lowers the protein percentage, mimicking cake flour's softer crumb.
Can I substitute baking soda for baking powder?
Yes, with an added acid: ¼ teaspoon of baking soda plus ½ teaspoon of cream of tartar replaces 1 teaspoon of baking powder. Baking soda alone won't work — it needs an acid to react with, and it's about 4× stronger, so it can leave a soapy taste if overdosed.
What is the best egg substitute in baking?
For structure-light bakes (muffins, pancakes, quick breads), a flax egg — 1 tablespoon of ground flaxseed whisked with 3 tablespoons of water, rested 5 minutes — is the most reliable per egg. ¼ cup of unsweetened applesauce per egg also works and adds moisture. Neither substitutes well beyond about 2 eggs, and neither works where eggs are the structure (soufflés, meringues, custards).
How do I substitute brown sugar with white sugar?
Mix 1 cup of granulated sugar with 1 tablespoon of molasses for light brown sugar, or 2 tablespoons for dark. That is literally what commercial brown sugar is, so the swap is exact.
Do these substitutions change how the bake turns out?
The best swaps here are near-identical in function; where a substitute behaves differently — heavy cream that won't whip, applesauce adding sweetness, flour thickening cloudier than cornstarch — the tool says so on the swap itself. When a substitution has no honest equivalent, we leave it out rather than pretend.
