- 1 tsp baking powder = ¼ tsp baking soda + ½ tsp cream of tartar + ¼ tsp cornstarch (King Arthur Baking)Mix and use immediately — homemade baking powder loses potency within minutes. The cornstarch prevents clumping; skip it if you don't have any.
Baking powder substitutes
Tested swaps for baking powder, with ratios and sources.
Measure substitutes by weight where you can. The Baking powder converter gives the grams.
Note: our substitutions are direct, not chained — we don't recommend substituting a substitute.