Question: how much baking powder for 1/2 tsp baking soda?
Answer: Ideally, triple the amount of baking soda to equal the amount of baking powder. So, if the recipe called for 1 tsp baking soda, you would use 3 tsp baking powder. Another options is to use twice the amount of baking powder as baking soda (add 2 tsp of baking powder if the recipe calls for 1 tsp baking soda).