Self-Rising Flour Calculator

How it is calculated

You enter the amount of plain all-purpose flour in cups. The tool multiplies that number by three fixed constants and does nothing else.

baking powder (tsp) = cups × 1.5
salt (tsp) = cups × 0.25
flour (g) = cups × 120

So the recipe is 1½ teaspoons of baking powder and ¼ teaspoon of salt per cup, and one cup of flour is counted as 120 g. Any amount above zero works, including fractions; zero, a negative number or a blank field shows no result. Teaspoon figures show one decimal when that is exact (4.5, 3.0) and two otherwise, so ¼ tsp appears as 0.25 and ¾ tsp as 0.75; an eighth of a teaspoon appears rounded as 0.13. Whisk the two additions into the flour well before using it.

Common mistakes

• Adding the baking powder and salt to flour that is already self-rising. It already contains them, so the bake will taste salty and may over-rise.
• Adding extra baking powder or salt from the recipe on top of the amounts shown. When the recipe lists baking powder separately alongside self-rising flour, the total will be too high.
• Confusing teaspoons with tablespoons. 4.5 tsp is 1½ tablespoons, not 4½ tablespoons.
• Entering grams as cups. The field is in cups; 360 g of flour is 3 cups, not 360, and the tool would then give 540 tsp of baking powder.
• Reading a rounded figure literally for small batches. Half a cup gives 0.13 tsp of salt, which really means an eighth of a teaspoon (0.125), so use a pinch rather than a full measure.