Sourdough · Cups to Grams
Convert cups of bread flour, all-purpose, whole wheat, water, and more to grams — and back — using standard baking weights.
1 cup =
120 g bread flour
A scale beats cups every time — but these standard weights get you close.
Live converter · updates as you type
Result
360g3 cups of bread flour
Grams per US cup
Standard averages. Cup weights vary with how flour is scooped and settled — a kitchen scale is always more accurate.
Baking conversions guide
Cups are convenient but imprecise — the weight of a "cup" of flour depends entirely on how you fill it. For bread, where hydration and ratios matter, weighing in grams is the single easiest upgrade to consistency.
Per cup, spooned and levelled — not scooped.
Per cup — 1 ml of water weighs about 1 g.
Extra flour a packed scoop can add versus spooning.
Example: 3 cups × 120g = 360g bread flour. Reverse it by dividing: 360 ÷ 120 = 3 cups.
Pick your ingredient, choose whether you're converting cups to grams or grams to cups, and enter the amount. The result updates instantly, using standard baking weights for each ingredient — and you can measure in cups, tablespoons, or teaspoons.
It's built for bread first — bread flour, all-purpose, whole wheat, rye, water, and starter are all included — but the common sweeteners and fats are there too for enriched doughs.
Sourdough depends on ratios — hydration, salt, and starter are all percentages of flour. If your flour weight is off, every ratio is off with it. Weighing in grams pins those ratios down so your loaf comes out the same each time.
Grams are also more precise than cups (1 gram versus a rough cup line) and faster in practice — you can weigh everything into one bowl on a scale, zeroing between each addition.
The biggest source of error with cups is how you fill them. Dipping the cup into the bag packs the flour down, so a "cup" can weigh anywhere from 120g up to 150g or more — a 20–30% swing that can wreck a bread recipe.
The standard 120g-per-cup weight assumes you spoon flour lightly into the cup and level it off with a knife. When in doubt, weigh — it sidesteps the problem entirely.
Bread flour and all-purpose are almost identical by weight, around 120g per cup — they differ in protein, not density. Whole wheat is a little lighter at about 113g, and rye lighter still at around 102g because of how the bran sits.
The converter keeps each flour separate so you always get the right weight, and the reference chart on the calculator lists them side by side.
If you don't have a scale, fluff the flour in the bag first, spoon it lightly into the cup without tapping or packing, then level the top with the back of a knife. That's the method the 120g-per-cup standard assumes.
Then use this converter to turn those cups into grams — so you can follow gram-based bread recipes and pair the result with the baker's percentage calculator.
Get the complete Sourdough Baking Playbook — all the calculators and conversions in one printable reference.
Quick answers for converting and measuring baking ingredients.
A cup of bread flour is about 120 grams when measured correctly (spooned into the cup and levelled, not scooped). Scooping straight from the bag packs the flour and can add 20–30% more, which is why weighing is more reliable than measuring by cup.
They are very close. Both bread flour and all-purpose flour weigh roughly 120 grams per cup. The difference between them is protein content, not weight, so you can use the same cup-to-gram conversion for either.
Cup measurements vary a lot depending on how the flour is scooped, packed, and settled — two bakers can put very different amounts in the same cup. Weighing in grams removes that variability, which is why serious bread recipes are written by weight.
A US cup of water weighs about 237 grams (roughly 236–240g). Water is convenient because 1 millilitre weighs almost exactly 1 gram, so 1 cup ≈ 237 ml ≈ 237 g.
Divide the weight in grams by the ingredient's grams-per-cup. For bread flour at 120g per cup, 360g ÷ 120 = 3 cups. Use the grams-to-cups mode of this converter to do it automatically for any ingredient.
Yes, slightly. Whole wheat flour is around 113g per cup and rye around 102g, while bread and all-purpose sit near 120g. The converter lists each ingredient separately so you get the right weight for the flour you're using.