How much cocoa powder is equal to 4 oz of bakers chocolate?

To substitute cocoa powder for baker's chocolate, you would use 4 tablespoons of cocoa powder for every 1 ounce of baker's chocolate. Therefore, to replace 4 ounces of baker's chocolate, you would need 16 tablespoons of cocoa powder. Keep in mind that cocoa powder is less fatty than baker's chocolate, so you may need to adjust the recipe by adding a bit more fat, such as butter or oil, to compensate for the difference.