Grams to cups:
flour.

Why "1 cup of flour" is ambiguous

Volume measures for flour are notoriously inconsistent. A loosely spooned and leveled cup of all-purpose flour weighs around 120 g. The same cup dug straight into the bag — the way most home bakers actually fill a cup — packs in enough extra flour to hit 145–150 g. That 25% gap is large enough to noticeably affect a cake's texture or a bread's crumb. Professional bakers weigh flour by grams precisely because a gram is unambiguous: it doesn't change based on humidity, bag settlement, or how gently you scoop.

Spoon and level — the right technique for cup measures

When a recipe developed with cup measures intends "spoon and level," the method is: use a spoon to scoop flour from the container into the measuring cup, filling it until it mounds slightly above the rim, then sweep a straight edge (a butter knife, the back of a ruler) across the top to level it off. Never pack or tap the cup. This technique produces the lightest, most reproducible measurement. If the recipe is from a US cookbook or food website that doesn't specify, spoon-and-level is the assumed method for almost all baking recipes published after the 1980s.

Cake flour vs all-purpose vs bread flour

Three flours, three different gram weights per cup, even when all are measured the same way:

• —Cake flour (100 g/cup) is milled very finely and bleached, making it lighter and more compressible. Less gluten, more tender crumb.
• —All-purpose flour (120 g/cup) is the benchmark. Most US baking recipes assume this weight unless a specialty flour is specified.
• —Bread flour (127 g/cup) has more protein and is slightly denser. Substituting it directly for AP flour without weighing will add extra gluten development.

Almond flour, oat flour, and gluten-free flours

Nut-based and grain-free flours behave differently. Almond flour (96 g/cup) is coarser and denser by volume but lighter by weight than AP. Oat flour (92 g/cup) is very light and airy. Coconut flour (112 g/cup) absorbs much more liquid per gram than any wheat flour — a recipe using coconut flour is almost never a 1:1 substitute. When working with these flours, measuring by weight is especially important because their variable particle sizes make cup measures particularly unreliable.

How to convert a flour-heavy recipe to grams

If you have a recipe in cups and want to convert it to grams for accuracy:

1. Identify the flour type (AP, bread, cake, etc.).
2. Look up the gram-per-cup weight from the table above.
3. Multiply by the cup amount (e.g., 2¼ cups AP = 2.25 × 120 g = 270 g).
4. For fractional amounts like ⅓ cup, use the ⅓ column directly.

Or paste the full ingredient list into the tool below and switch to Metric mode — it applies density-based conversion automatically.

Storing flour and its effect on weight

How flour is stored affects how it measures. Flour that has settled after sitting undisturbed in a bag for weeks can be 10–15% denser than freshly opened flour that has been aerated by handling. Before measuring by cup, fluff the flour in its container by stirring gently with a spoon to loosen it — this brings measurements closer to the intended density. Flour stored in a canister that gets scooped daily becomes progressively more packed. For consistent results, either aerate before each use or switch to weighing by grams, which eliminates the storage variable entirely.

Substituting gluten-free flours by weight

When using gluten-free flours as wheat flour substitutes, substituting by gram weight rather than cup volume gives the best starting point. Different gluten-free flours have very different absorption rates, so even with weight-for-weight substitution you'll often need to adjust liquid. Coconut flour is the most extreme case: it absorbs four to six times more liquid per gram than all-purpose flour, so a weight-for-weight swap would produce a very dry, dense result. Blended gluten-free flour mixes (designed to replace AP flour at 1:1 by weight) are the most straightforward substitutes — use them at the same gram weight as the AP flour in the recipe.