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Baking powder is just baking soda pre-mixed with a dry acid, which means you can rebuild it from pantry staples in ten seconds. The only rule: the DIY versions start working the moment they get wet, so mix and bake immediately.
Best for: Any recipe · the closest match to the real thing
Add ¼ tsp cornstarch if storing a bigger batch to keep it dry.
Best for: Pancakes, muffins, quick breads
Stir the acid into the wet ingredients, not directly onto the soda.
Best for: Biscuits, cakes, cornbread
Remove ½ cup of other liquid from the recipe to keep the batter balanced.
Best for: Recipes using 1 to 2 tsp powder per cup of flour
Skip the recipe's added baking powder and salt · the flour already has both.
Never swap baking soda for baking powder 1:1 · soda is about four times stronger, and without enough acid to neutralize it you get a soapy, metallic taste and a collapsed crumb. All DIY versions are single-acting: they fizz once, at mixing, so the pan goes into the oven right away.
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Only with an acid. Use ¼ teaspoon of baking soda plus ½ teaspoon of lemon juice or vinegar for every teaspoon of baking powder the recipe calls for. Baking soda alone won't rise properly and tastes soapy in that quantity.
Most US brands are · they use cornstarch as the buffer. Some brands abroad use wheat starch, so check the label if you're baking gluten-free. Rumford and Clabber Girl are labeled gluten-free.
The soda neutralizes an acidic ingredient (buttermilk, cocoa, brown sugar) and boosts browning; the powder provides the reliable lift. If you're substituting, keep that balance rather than merging them into one.
Related guides: Baking Soda · Cream of Tartar · Self-Rising Flour · Buttermilk · All guides