1 cup all-purpose flour in grams
Quick answer
1 US cup of all-purpose flour ≈ 120 g. Spooned & leveled.
Grams
120
Cups → grams table
| Cups | Grams |
|---|---|
| 0.25 | 30 |
| 0.333 | 40 |
| 0.5 | 60 |
| 0.75 | 90 |
| 1 | 120 |
| 1.5 | 180 |
| 2 | 240 |
| 3 | 360 |
Smaller measures of flour
Recipes rarely call for a round cup. Since a US cup is 16 tablespoons (48 teaspoons), the same 120 g/cup density gives:
| Measure | In cups | Grams |
|---|---|---|
| 1 teaspoon | 1/48 | 2.5 g |
| 1 tablespoon | 1/16 | 7.5 g |
| 1/4 cup | 0.25 | 30 g |
| 1/3 cup | 0.333 | 40 g |
| 1/2 cup | 0.5 | 60 g |
Why cup measurements drift
A cup measures volume, not weight, so the gram figure depends on how densely the flour sits in the cup. Two people measuring "one cup" from the same bag can differ by 10–20% — which is why baking recipes that matter tend to be written in grams.
- Scooping compacts. Dipping the cup into the bag presses the contents down and packs in more than the recipe intended. Spooning it in loosely and levelling the top with a straight edge is closer to the published figure.
- Settling matters. Anything that has been sitting in a bag or jar has compacted on its own. Loosening it first gives a more repeatable measure.
- Cup size is not universal. A US customary cup is about 240 ml, a metric cup is 250 ml, and an Imperial cup is roughly 284 ml. The 120 g figure above is per US cup — using a metric cup gives about 125 g instead.
- Humidity and brand vary. Densities are culinary averages, not lab constants. When the ratio really matters, weigh it.
Frequently asked questions
How many grams is 1 cup of all-purpose flour?
About 120 grams per US cup (spooned & leveled). Densities are culinary averages — weigh when precision matters.
How many grams in a cup of flour?
A cup of flour is about 120 grams. Use the calculator above for other amounts, like 2 or 3 cups.