Can baking soda be used instead of baking powder?
What happens if I use baking soda instead of baking powder?
However, if you're in a pinch, the substitution is one teaspoon baking soda equals three teaspoons baking powder. Baking soda is also much stronger than baking powder and, by trying to provide enough leavening, you may wind up with an unpleasant metallic, salty taste in the final baked product.