Conversion
Self-Rising Flour: US cups to milliliters
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The answer
1 US cup of self-rising flour
= 237 ml
King Arthur Baking ingredient weight chart: Self-Rising Flour = 113g per 1 cup.
Common amounts
Quick reference for the amounts most recipes call for.
| US cups | milliliters |
|---|---|
| 1/4 US cups | 59.1 ml |
| 1/3 US cups | 78.1 ml |
| 1/2 US cups | 118 ml |
| 2/3 US cups | 159 ml |
| 3/4 US cups | 177 ml |
| 1 cup | 237 ml |
| 1 1/2 US cups | 355 ml |
| 2 US cups | 473 ml |
| 3 US cups | 710 ml |
| 4 US cups | 946 ml |
By measurement system
A "cup" is not one fixed size. Different countries use different volumes. Here is one cup of self-rising flour converted to milliliters for each system.
| System | 1 cup | 1 tbsp | 1 tsp |
|---|---|---|---|
| US Legal | 237 ml | 14.8 ml | 4.93 ml |
| US Customary | 237 ml | 14.8 ml | 4.93 ml |
| UK Metric | 250 ml | 15.0 ml | 5.00 ml |
| UK Imperial | 284 ml | 17.8 ml | 5.00 ml |
| Australia | 250 ml | 20.0 ml | 5.00 ml |
| Metric / EU | 250 ml | 15.0 ml | 5.00 ml |
| Japan | 200 ml | 15.0 ml | 5.00 ml |
The Australian tablespoon is 20ml, not 15ml like everywhere else. This is the most common conversion mistake when adapting AU recipes.
Why this conversion is tricky
Self-rising flour is the trickiest flour to weigh accurately because you are not just measuring flour, you are measuring a pre-blended chemical leavening system. A typical bag carries roughly 1.5 teaspoons of baking powder and a quarter teaspoon of salt distributed through every cup, and those leavening crystals do not pack the way wheat protein and starch do. Baking powder is hygroscopic, the salt is denser than the surrounding flour, and the whole blend tends to clump and settle during shipping. By the time the bag reaches your counter, the top third often reads lighter on a scale than the bottom third, which is why the King Arthur Baking ingredient weight chart pegs self-rising flour at 113 grams per cup, slightly lower than the 120 grams of bread flour and well below the 125 grams of all-purpose. The flour itself is milled from soft winter wheat with lower protein (around 8.5 percent), so the particles are finer and fluffier, and they trap air more readily than the harder all-purpose grind most American recipes assume.
The single most common mistake is treating self-rising flour as a one-to-one weight swap for all-purpose. Cooks see "1 cup flour" in a recipe, reach for the self-rising bag because it is what is open, and weigh out 125 grams. They have just added roughly 10 percent more flour than the recipe wanted, plus an unintended dose of baking powder that the original recipe never accounted for. The biscuit comes out dense and oddly bitter, the cake domes and cracks, and the cook blames the recipe. Self-rising flour weighs 113 grams per cup precisely because it is softer and lighter, and the leavening dose is calibrated to that volume, not to a generic flour weight.
To measure correctly, fluff the flour in the bag with a fork or whisk before you scoop. Self-rising flour compacts in storage more aggressively than plain flour because the baking powder absorbs ambient moisture and binds particles together. Once fluffed, spoon the flour gently into a dry measuring cup until it mounds over the rim, then sweep the excess off level with the back of a knife. Never dip the cup directly into the bag; that scoop-and-tap technique can pack 140 grams or more into a vessel that should hold 113. A digital scale set to grams ends the guesswork entirely, and self-rising flour is the one flour where the scale matters most because you are dosing leavening as well as bulk.
Density precision matters most for Southern-style biscuits, drop dumplings, scones, quick breads, and the Victorian sponge cakes that British bakers build on self-raising flour. These are recipes with short ingredient lists and minimal mechanical structure, where the leavening blend is doing nearly all the work to produce lift. An extra 12 grams of flour in a biscuit dough is an extra 12 grams that the pre-mixed baking powder cannot push, and you get hockey pucks instead of fluffy layers. A Victoria sponge made with overweighed self-raising will sink in the middle because the batter is too thick for the chemical leavening to expand evenly. Yeasted breads and laminated doughs are far more forgiving of weight variance because the yeast adapts; chemical leavening cannot.
For substitutions, the working ratio is one cup of self-rising flour equals one cup of all-purpose flour plus 1.5 teaspoons of baking powder and a quarter teaspoon of fine salt. By weight, that is 125 grams of all-purpose flour with the same leavening additions, not 113 grams; you compensate for the protein difference with a slightly heavier flour dose because all-purpose holds more structure on its own. Going the other direction, if a recipe calls for all-purpose plus baking powder and salt and you only have self-rising, reduce the baking powder and salt in the recipe to zero and use 113 grams of self-rising per cup of all-purpose called for. The flour is fresh for about six months once opened; after that, the baking powder loses potency and the conversion math stops working no matter how carefully you weigh.
Frequently asked questions
How many milliliters are in 1 US cup of self-rising flour?
1 US cup of self-rising flour equals 237 milliliters, computed using a density of 0.4776 grams per milliliter sourced from King Arthur Baking ingredient weight chart.
Why does a generic converter give a different answer?
Generic converters assume one milliliter equals one gram, which is true only for water. Self-Rising Flour has its own density. Using the correct density gives ingredient-specific accuracy that matters in baking.
Does the cup size matter for self-rising flour?
Yes. A US legal cup is 240 ml, a US customary cup is 236.59 ml, a UK metric cup is 250 ml, an Australian cup is 250 ml (with a 20 ml tablespoon), and a Japanese cup is 200 ml. The conversion table on this page shows the answer for each system.