Baking powder from vinegar & baking soda

equivalent of 1 teaspoon baking powder

1/4 teaspoon baking soda

1 teaspoon vinegar

equivalent of 2 teaspoons baking powder

1/2 teaspoon baking soda

2 teaspoons vinegar

equivalent of 1 tablespoon baking powder

3/4 teaspoon baking soda

1 tablespoon vinegar