Match the job, not the name. Ingredients do mechanical work — structure, fat, moisture, acid, lift. A substitute succeeds when it does the same work in the same amount, which is why every ratio below is exact rather than “about a cup,” and why each carries a quality rating instead of a shrug.
Ratios come straight from our substitution database — the same data behind every substitute page on this site. The rating tells you how close the result comes to the original; the link goes to the full guide with alternatives and recipe-specific notes.
| Out of | Best substitute | Ratio | Rating |
|---|---|---|---|
| Buttermilk | Milk + Lemon Juice | 1 cup milk + 1 tbsp lemon juice, let sit 5 minutes | Excellent |
| Eggs | Applesauce | 1/4 cup per large egg | Good |
| Cake Flour | All-Purpose Flour + Cornstarch | For 1 cup cake flour: use 1 cup AP flour minus 2 tbsp, add 2 tbsp cornstarch | Excellent |
| Baking Powder | Baking Soda + Cream of Tartar | 1/4 tsp baking soda + 1/2 tsp cream of tartar per 1 tsp baking powder | Excellent |
| Baking Soda | Baking Powder | Use 3x the amount of baking powder (1 tsp soda = 1 tbsp powder) | Good |
| Brown Sugar (packed) | White Sugar + Molasses | 1 cup white sugar + 1 tbsp molasses (light) or 2 tbsp (dark) | Excellent |
| Sour Cream | Greek Yogurt | 1:1 | Excellent |
| Butter | Coconut Oil | 1:1 by weight | Good |
| Heavy Cream | Coconut Cream | 1:1 | Good |
| Cornstarch | Arrowroot Powder | 1:1 | Excellent |
| Whole Milk | Oat Milk | 1:1 | Excellent |
| Vanilla Extract | Vanilla Bean Paste | 1:1 | Excellent |
Flour proteins and eggs build the scaffold that traps gas and sets in the oven. Substitutes here are the least forgiving — swapping flours changes both protein and weight per cup, which is why the cake flour swap removes 2 tablespoons of AP flour before adding cornstarch, and why flour substitutions should happen by weight, not cup-for-cup.
Fat tenderizes, carries flavor, and — when it's solid — creates lift through creaming and lamination. That solid/liquid distinction is the whole game: coconut oil swaps for butter 1:1 by weight because it's also solid at room temperature; a liquid oil in the same spot costs you the creamed-air structure.
Water content controls hydration; acidity controls both flavor and leavening chemistry. The classic: milk plus lemon juice replaces buttermilk because the added acid does buttermilk's real job — activating baking soda. Skip the acid and your soda has nothing to react with.
Baking soda needs an acid partner; baking powder brings its own. They're convertible — soda + cream of tartar makes baking powder, and 3x baking powder stands in for soda — but never 1:1. Leavening errors don't average out; they show up as soap flavor or a sunken center.
Every substitution in our database carries one of three ratings, assigned on how close the swap gets to the original across texture, flavor, and structure — not just whether the bake survives:
Match the job, not the name. Every ingredient does mechanical work — providing structure, fat, moisture, acidity, or lift — and a substitute has to do the same work in roughly the same amount. That's why Greek yogurt swaps cleanly for sour cream (same acidity, fat, and water) while oil for butter changes the crumb: it does the fat job but not the structure job.
By weight, whenever the ratio allows it. A 1:1 volume swap between ingredients of different densities silently changes the quantity — a cup of honey weighs 340 g while a cup of sugar weighs 200 g. Our substitution pages give ratios in the form bakers actually use, with weights wherever precision matters.
Only in one direction, and not 1:1. Baking powder can stand in for baking soda at 3x the amount (1 tsp soda = 1 tbsp powder), though it may slightly affect browning. Going the other way requires adding acid: 1/4 tsp baking soda plus 1/2 tsp cream of tartar replaces 1 tsp of baking powder.
Tolerance. Cookies and muffins are forgiving structures — small changes in fat, acidity, or moisture get absorbed. Cakes and laminated doughs are balanced systems where each ingredient's job is load-bearing. That's why every substitution on this site carries a quality rating, and why the recipe-specific pages exist: the same swap can be excellent in muffins and moderate in cake.