Self Rising Flour Substitute

I don't know about you, but I don't have room for a bunch of different types of flour at my house. I usually buy all purpose flour and assume I can use it for everything. Well today, I made something that said to definitely use self rising flour. Since I didn't have any, I googled what a substitution would be. For every one cup of self rising flour needed, add 1 and 1/4 teaspoon baking powder to 1 cup all purpose flour.

1 cup self rising flour= 1 cup all purpose flour + 1 and 1/4 teaspoon baking powder