Self-rising flour grams to cups
To convert grams to cups, divide the grams by 120. For example, 100 g of self-rising flour ≈ 0.83 cup.
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Self-rising flour is soft wheat flour pre-blended with baking powder and salt, so 1 US cup weighs about 120 grams. Because the leavening is mixed in by volume, weighing it is the only way to keep your rise consistent batch to batch.
Self-rising flour grams to cups chart (US cup)
| Grams | Cups (approx.) | Decimal cups |
|---|---|---|
| 25 g | 0.21 cup | 0.21 |
| 50 g | 0.42 cup | 0.42 |
| 75 g | 0.62 cup | 0.62 |
| 100 g | 0.83 cup | 0.83 |
| 125 g | 1 cup | 1.04 |
| 150 g | 1¼ cups | 1.25 |
| 175 g | 1.46 cups | 1.46 |
| 200 g | 1⅔ cups | 1.67 |
| 250 g | 2.08 cups | 2.08 |
| 300 g | 2½ cups | 2.5 |
| 400 g | 3⅓ cups | 3.33 |
| 500 g | 4.17 cups | 4.17 |
Why self-rising flour weighs what it does
Self-rising flour is milled from soft, low-protein wheat (often around 8-9% protein), which packs less densely than bread flour, landing near 120 g per cup. But the real variable is the built-in leavening: roughly 1.5 teaspoons of baking powder and a pinch of salt are distributed throughout, and that powder can settle or compact in the bag over time. Brands like White Lily run lighter and fluffier, while UK self-raising flour skips the salt, so a scooped cup can swing 110-130 g depending on how packed and how fresh the bag is.
How to measure self-rising flour
Never dip the cup into the bag with self-rising flour. Scooping compresses both the flour and the leavening, packing in 20-30 g extra and throwing off the baking powder ratio. Instead, fluff the flour first, spoon it lightly into the cup, and level with a straight edge. Weighing 120 g is far more reliable.
Common mistake
Treating self-rising and all-purpose flour as interchangeable by weight. They weigh similarly per cup, but self-rising carries baking powder and salt, so swapping it into a recipe with its own leavening doubles the rise, then collapses. Also, an old bag loses lift as the baking powder dies.
Other cup sizes
| Cup type | 1 cup of self-rising flour |
|---|---|
| US cup (240 ml) | 120 g |
| Metric cup (250 ml) | 125 g |
| Australian / South African cup (250 ml) | 125 g |
| Imperial cup (284 ml) | 142 g |
Where it matters
Self-rising flour shines in Southern biscuits, scones, quick breads, pancakes, and 2- and 3-ingredient doughs where the leavening is meant to be built in. Getting 120 g right matters most in biscuits and scones, where too much flour means dense, dry results and the wrong powder ratio leaves a metallic, soapy aftertaste.
FAQ
Can I make my own self-rising flour?
Yes. For each cup (120 g) of all-purpose flour, whisk in 1.5 teaspoons baking powder and 0.25 teaspoon salt. Use it promptly, since freshly mixed baking powder gives the most reliable lift.
Is 1 cup of self-rising flour really 120 grams?
About 120 g for a properly spoon-and-leveled US cup. Lighter Southern brands like White Lily can come in closer to 110 g, while a packed cup can hit 130 g or more.
Does self-rising flour expire?
The flour itself lasts months, but the baking powder in it weakens over time. After 6-12 months an opened bag may bake flat, so buy smaller quantities if you use it occasionally.
Why weigh self-rising flour instead of using cups?
Because the leavening is mixed in by volume, an over-scooped cup adds both extra flour and extra baking powder at once, which is why weighing 120 g keeps both the texture and the rise consistent.