Plain Flour — Cups to Grams
1 cup of plain flour = 125 grams
1 cup of plain flour weighs approximately 125 grams. Use the converter below for custom amounts, or check the full conversion table.
Plain Flour Converter
Result
125 g
Why Does Plain Flour Weigh 125g Per Cup?
Plain flour is surprisingly light — about half the density of water. This is because flour particles don't pack tightly; there's a lot of air between them. When you scoop flour, you compress these air pockets, which is why scooped flour weighs more than spooned flour. The same cup can hold 120g (spooned) or 155g (scooped) — a 30% difference that can ruin recipes.
A cup of flour weighs roughly half what a cup of water weighs. If you filled the same cup with sugar, it would weigh nearly twice as much as the flour.
When Does Precision Matter for Plain Flour?
Flour measurement is critical in almost all baking. In bread, too much flour creates dense, heavy loaves; too little results in sticky dough that won't hold shape. In cakes and pastries, excess flour produces tough, dry results. The 30% variance between scooped and spooned flour can be the difference between success and failure. For sauces and gravies where flour is a thickener, precision matters less — a tablespoon more or less won't ruin the dish. Rule of thumb: if the recipe involves gluten development or precise ratios (bread, pastry, macarons), weigh your flour. For pancakes, muffins, and quick breads, careful cup measuring is usually fine.
How to Measure Plain Flour Correctly
The correct way to measure plain flour is the spoon-and-level method: use a spoon to lightly fill your measuring cup, then level it off with a straight edge. Never scoop flour directly from the bag, as this compacts it and adds too much. Scooping can add up to 30% more flour, which can ruin your baked goods. For precision baking, always use a digital kitchen scale — weight measurements are far more accurate and consistent than volume measurements. For best results, use a digital kitchen scale for precision baking.
Understanding Plain Flour Measurements
Plain flour (also called all-purpose flour) is one of the most commonly used ingredients in baking, and its density makes accurate measurement crucial. One cup of plain flour weighs approximately 120-125 grams when spooned and levelled, but this can vary significantly depending on how it's measured. Learn more about how to measure flour correctly.
Common Uses in Baking & Cooking
Plain flour is the foundation of most baked goods, from cakes and cookies to bread and pastries. It's also used as a thickener in sauces and gravies. The protein content (typically 10-12%) makes it versatile for a wide range of recipes. For best results in baking, always measure flour accurately, as too much or too little can significantly affect texture and structure. If you need a substitute, see our Plain Flour substitution guide.
Storage and Handling Tips
Store plain flour in an airtight container in a cool, dry place. It can be kept at room temperature for up to a year, or in the freezer for longer storage. If your flour has been stored for a while, sift it before using to ensure it's not compacted.
Need to convert plain flour to other units? Try our cups to grams converter or tablespoons to grams converter.
Related Guides
How to Measure Flour Correctly | Spoon & Level Method
Learn the correct way to measure flour using the spoon and level method. Why scooping flour directly from the bag can add up to 30% more flour and ruin your baking.
Cups to Grams Conversion Chart | 100+ Ingredients
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US Cups vs UK Cups — What's the Difference?
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Plain Flour Conversion Table
| Amount | Grams | Ounces |
|---|---|---|
| 1 teaspoon | 2.6g | 0.09 oz |
| 1 tablespoon | 7.81g | 0.28 oz |
| ¼ cup | 31.3g | 1.1 oz |
| ⅓ cup | 41.7g | 1.47 oz |
| ½ cup | 62.5g | 2.2 oz |
| ⅔ cup | 83.3g | 2.94 oz |
| ¾ cup | 93.8g | 3.31 oz |
| 1 cup | 125g | 4.41 oz |
| 1½ cups | 188g | 6.61 oz |
| 2 cups | 250g | 8.82 oz |
Plain Flour — US, Metric & UK Cup Conversions
Cup sizes vary by country. This table shows how much plain flour weighs when measured with US cups (most online recipes), metric cups (Australia, NZ, Canada), or UK/Imperial cups.
| Amount | US Cup(236.6 ml) | Metric Cup(250 ml) | UK Cup(284 ml) |
|---|---|---|---|
| ¼ cup | 31.3g | 33g | 37.5g |
| ⅓ cup | 41.7g | 44g | 50g |
| ½ cup | 62.5g | 66g | 75.1g |
| ⅔ cup | 83.3g | 88.1g | 100g |
| ¾ cup | 93.8g | 99.1g | 113g |
| 1 cup | 125g | 132g | 150g |
| 1½ cups | 188g | 198g | 225g |
| 2 cups | 250g | 264g | 300g |
Note: US cups (236.6 ml) are standard in most online recipes. Metric cups (250 ml, used in Australia, NZ, Canada) hold 5.7% more. UK/Imperial cups (284 ml) hold 20% more than US cups.
Measurement Note
Spooned into the cup and levelled, not scooped or packed.
Need a Substitute?
Out of plain flour? We've got 5 tested alternatives with exact ratios.
Frequently Asked Questions
Why does my cup of flour weigh different amounts each time?▼
Is a US cup of flour the same as a UK or Australian cup?▼
Can I substitute plain flour for bread flour or cake flour?▼
How much does 100g of plain flour equal in cups?▼
Should I sift flour before or after measuring?▼
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Values are approximate and can vary depending on how the ingredient is measured. For precision baking, we recommend using a digital kitchen scale.