G'day,
Just wondering if anyone out there knows the ratio of plain flour to raising agent to convert it to self rasing flour,
:) taa whingypom

Here's the most common recipe:
3/4 cup all-purpose flour
1 teaspoon baking powder
1/4 teaspoon salt
Store in tightly lidded container

I hope that helps!

Add 500 grams flour to 2.5 of baking powder