Self-raising flour recipe calculator
How much baking powder do you need?
If you're baking from a British, English, or Commonwealth cookbook, the recipe might well call for self-raising flour. Note that this is different from US self-rising flour, in that it has more baking powder and no salt.
Units:
If the recipe calls for:
- g of self-raising flour
Then use...
- g of all purpose flour, and
- g of baking powder

Happy baking!
Show workings
The calculation assumes self-raising flour is 5.5% baking powder and 94.5% all purpose flour. The references I found said either 1 cup of flour to 2 teaspoons of baking powder, or 150g flour to 2 teaspoons of baking powder. 5.5% ended up seeming reasonable, and seems to work well.
References:
- Ask Nigella
- The Spruce Eats
- Bigger Bolder Baking
- Bread, Cakes And Ale
- And my un-scientific measurement that 1 cup of flour is 145.5g, and 1 teaspoon of baking powder is 4.2g