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All-purpose flour:
grams to cups.
One cup of all-purpose flour weighs 120 g when spooned and leveled — the standard technique assumed by most US baking recipes. Scoop the cup straight from the bag and that same cup can hit 145–150 g, a 25% swing that noticeably changes texture.
All-Purpose Flour: grams to cups
Approximate cup fractions for common gram amounts. Based on 120 g per cup.
| Grams | Cups (approx) | Decimal |
|---|---|---|
| 25 g | ¼ | 0.21 |
| 50 g | ½ | 0.42 |
| 100 g | ¾ | 0.83 |
| 150 g | 1 ¼ | 1.25 |
| 200 g | 1 ⅔ | 1.67 |
| 250 g | 2 ⅙ | 2.08 |
| 500 g | 4 ⅙ | 4.17 |
All-Purpose Flour: cups to grams
Based on 120 g per cup.
| Volume | Grams (g) |
|---|---|
| 1 cup | 120 g |
| ¾ cup | 90 g |
| ½ cup | 60 g |
| ⅓ cup | 40 g |
| ¼ cup | 30 g |
| 1 tbsp | 8 g |
| 1 tsp | 3 g |
Convert all-purpose flour instantly
Why all-purpose flour is the measuring baseline
All-purpose flour is the reference point against which every other flour is judged, which is why its density matters more than any other. The 120 g/cup figure assumes a specific technique: a spoon loosens the flour in its container, the measuring cup is filled by spooning flour in (never scooping), and a straight edge levels the top. Bakers who skip the spoon-and-level step routinely end up with 20–30 g of extra flour per cup, which is enough to make cookies spread less, cakes turn dense, or muffin tops crack. Switching to grams eliminates this entirely — 120 g is 120 g regardless of humidity, how long the bag has been sitting, or whether someone just rummaged through it.
Protein content and how it affects your conversion choices
All-purpose flour sits at 10–12% protein, a middle ground that makes it genuinely versatile. When you convert a recipe from AP flour to a higher-protein flour like bread flour (127 g/cup), you're not just adding extra weight per cup — you're also adding more gluten-forming proteins that will make the final texture chewier. If a recipe developed for AP flour calls for 240 g (2 cups), substituting bread flour by weight keeps the flour mass the same but still changes the gluten structure. This is why weight-based recipes are easier to scale and substitute: you can reason about the protein content separately from the volume measurement.
Frequently asked questions
- How many grams is 2 cups of all-purpose flour?
- 2 cups of all-purpose flour weigh 240 g using the spoon-and-level method (2 × 120 g). If you scoop the cup directly into the bag, the same 2 cups can weigh up to 300 g.
- Is 1 cup of all-purpose flour always 120 g?
- Most US baking sources use 120–125 g per cup. The exact figure depends on technique — King Arthur Flour uses 120 g, while older US cookbooks sometimes used 130–140 g because they assumed a scooped cup. For consistent results, weigh.
- How many cups is 500 g of all-purpose flour?
- 500 g ÷ 120 g/cup ≈ 4.17 cups, which is just over 4 cups and 2 tablespoons.
Common substitutions
| Substitute for all-purpose flour | Ratio | Notes |
|---|---|---|
| Bread flour | 1:1 by weight | Higher protein (12–14%) gives chewier texture. Use in yeast breads; avoid in delicate cakes. |
| Cake flour | 1:1 by weight | Lower protein (8%) produces a more tender crumb. Best for cakes and muffins, not yeast breads. |
| Whole wheat flour | 1:1 by weight (partial swap) | Replace up to 50% of AP flour. Adds density and nutty flavour; increase liquid by 1–2 tsp per 100 g swapped. |
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