Last updated: October 2026
The short answer
One US cup of all-purpose flour, measured the way baking references assume, weighs 120–130 g. The range exists because published standards differ slightly: several professional sources use 120 g per cup, the USDA-derived tables commonly used in nutrition work say 125 g, and some brands print 130 g. Any of those is close enough for home baking. None of them is 200 g.
Where the 200-gram figure comes from is worth understanding, because it is not simply a typo. It is what happens when two separate effects are stacked on top of each other.
Effect one: flour compacts
Flour is roughly half air by volume as it sits in the bag. How you fill the cup therefore changes what the cup contains:
| Method | Weight of 1 US cup of all-purpose flour | Relative to spoon-and-level |
|---|---|---|
| Sifted first, then spooned in | ≈ 110 g | about 12% lighter |
| Spooned in and levelled (the standard method) | ≈ 125 g | baseline |
| Scooped with the cup straight from the bag | ≈ 150–160 g | 20–30% heavier |
| Scooped, then tapped or shaken to settle | ≈ 170–190 g | 40–50% heavier |
So the same "one cup" of flour can contain anything from 110 g to 190 g depending entirely on the hand holding the cup. That is a bigger spread than most recipes can absorb.
Effect two: the cups are not the same cup
A US customary cup is 236.6 mL. The metric cup used in Australia, New Zealand, Canada and most of Europe is 250 mL, and a Japanese or Chinese rice-cooker measuring cup is 180 mL. Recipes travel between these systems constantly and rarely say which one they mean.
Multiplying the confusion: a 250 mL cup of compacted flour lands right around 190–200 g. That is how "1 cup of flour = 200 g" gets written down, copied, and then repeated on recipe sites that never weigh anything.
What the professionals actually use
These are the weights behind the spoon-and-level method, per US cup. They are the numbers a recipe assumes when it lists cups instead of grams:
| Ingredient | Per 1 US cup (236.6 mL) | Note |
|---|---|---|
| All-purpose flour | 120–130 g | the figure that started this article |
| Bread flour | 120–127 g | slightly denser than AP |
| Whole-wheat flour | 113–120 g | absorbs more water, weighs less |
| Granulated sugar | 200 g | the "200" people confuse with flour |
| Brown sugar (packed) | 213–220 g | packing is part of the instruction |
| Butter | 227 g | exactly half a US pound |
| Cocoa powder | 85–100 g | very compressible |
| Rolled oats | 90–100 g | large flakes trap more air |
| Honey or syrup | ≈ 340 g | density above 1.4 g/mL |
| Water | ≈ 237 g | 1 mL = 1 g by definition |
Notice that sugar really is about 200 g per cup. If a recipe mistakenly lists flour at 200 g per cup, the most likely explanation is not malice but a copy-paste from a sugar row in a conversion table.
When the difference matters, and when it does not
It matters for bread, biscuits, scones, pie crust, pasta dough and anything laminated, because those depend on the flour-to-water ratio to build structure. Adding 30% more flour to a bread dough turns a soft, slightly tacky dough into something that will not hydrate properly, and the loaf comes out dense and dry.
It matters less for brownies, quick breads, muffins and sauces, where fat and liquid buffer the error. It also matters less for drop cookies, though they will spread differently from batch to batch.
It matters most of all when you scale a recipe up. A 25% error on one cup is annoying; the same error multiplied across a 3× batch is the difference between a dough you can shape and a dough you have to rescue.
How to measure flour without a scale
If you have no kitchen scale, this sequence reproduces roughly 125 g per cup reliably:
- Stir the flour in its container to loosen it — it settles during storage.
- Spoon it into the measuring cup until the cup overflows.
- Sweep the flat edge of a knife across the top to level it.
- Do not tap the cup, do not shake it, do not press the flour down.
The one thing to avoid is the motion everyone does by default: plunging the measuring cup into the flour bag. It feels faster and it is, but it compacts the flour against the sides of the cup and can add a third to the weight.
The one-line fix
Weigh the flour in grams whenever you can; the numbers in a recipe finally mean what they say. When you cannot, use spoon-and-level, pick 125 g as your working standard, and stay consistent — a recipe repeated with the same habit will behave predictably even if the absolute number is a few grams off.
Convert any ingredient
Our grams-to-cups converter covers 27 baking ingredients with their individual densities and gives cups, tablespoons, teaspoons, millilitres and ounces at once. If you are changing batch sizes, recipe scaling multiplies every quantity including fractions; cake pan converter handles the pan-area side of the same problem; and coffee ratio calculator applies the same weight-based logic to brewing. The guides index collects the rest of these deep dives.
Frequently asked questions
How many grams is 1 cup of all-purpose flour?
Using the spoon-and-level method, one US cup of all-purpose flour weighs about 125 g. Professional references range from 120 g to 130 g per cup depending on the brand's stated standard, but scooping the cup straight out of the bag can push the same cup to 150–160 g because the flour is compacted.
Why do some recipes say 1 cup of flour is 200 g?
That figure usually comes from mixing up volume units or from packed flour. A metric cup is 250 mL rather than 236.6 mL, and if the flour is scooped and tapped down, the same cup can hold far more. Both effects push the number up, but neither matches how flour is normally measured in a US kitchen.
Does the flour weight difference actually change my baking?
It depends on what you are baking. Bread, biscuits, pastry and anything where the flour-to-liquid ratio controls structure are sensitive: a 25% flour difference can turn a soft dough into a dry, crumbly one. Brownies, quick breads and sauces tolerate a lot more because they contain enough liquid and fat to absorb the error.
How do I measure flour without a scale?
Fluff the flour in its container, spoon it into the measuring cup until it overflows, then level it with the flat edge of a knife. Never scoop the cup into the bag and never tap or shake the cup to settle the flour — both compact it and add 20–30% to the weight.