Is self rising flour the same as cake flour?

Is self rising flour the same as cake flour?

No they are absolutely not the same. Self rising flour would typically be the same as All Purpose flour with a little salt and baking powder in it. Cake Flour has a lower protein/gluten count than All Purpose. In a decently stocked pantry, I see absolutely no reason to buy self rising or cake flour.

How do you make bread flour from all purpose flour?

This converts all-purpose flour to a form that can be used just like bread flour. This ratio scales proportionally. For instance, if your recipe calls for 2 1/2 cups of bread flour, you would add 2 1/2 teaspoons vital wheat gluten to 2 1/2 cups of all-purpose flour.