How much double action baking powder per cup of wheat flour?

The typical amount of double-acting baking powder per cup of wheat flour is 1 1/2 teaspoons.

However, this can vary slightly depending on:

* The recipe: Some recipes may call for more or less baking powder depending on the other ingredients and the desired texture.

* The type of flour: Whole wheat flour often requires more baking powder than all-purpose flour due to its lower gluten content.

* The age of the baking powder: Baking powder loses potency over time. If your baking powder is older, you may need to use a bit more.

Here's a general rule of thumb:

* For cakes and muffins: 1 1/2 teaspoons per cup of flour

* For quick breads: 2 teaspoons per cup of flour

It's always a good idea to check the recipe for specific instructions.