Cups of Flour to Grams

Cups to grams — quick reference

The formula

Cups of all-purpose flour to grams is a single multiplication by one density, 120 grams for every 240 ml cup. The arithmetic is linear, so fractions and multiples behave exactly as you would expect and there is no table to look anything up in.

The interesting version of the formula is the second one, where you swap the density for the compacted figure. That is not a different calculation, it is the same calculation with the number that your hands actually produced rather than the number the recipe assumed.

grams = cups × 120
cups = grams ÷ 120
scooped instead: grams = cups × 160
grams per tablespoon = 120 ÷ 16 = 7.5

Worked example: a loaf recipe calls for 3 cups of all-purpose flour. Measured the intended way, 3 × 120 = 360 grams. Scooped from the bag at the compacted figure King Arthur publishes, 3 × 160 = 480 grams. The gap is 120 grams — a full extra cup of flour in a three-cup recipe, arriving invisibly, and in a bread dough that alone takes the hydration from comfortable to stiff.

The same arithmetic run backwards is how you use a European recipe. A brioche asking for 500 grams of flour is 500 ÷ 120 = 4.17 cups, which is four cups plus about two and a half tablespoons — a quantity no measuring cup set expresses cleanly, and a good demonstration of why the gram figure is the more usable one.

One caveat on the density itself. Published flour weights differ a little between kitchens because they are measured, not defined: King Arthur uses 120 grams a cup and Serious Eats has historically converted at five ounces, about 142 grams, precisely because it assumes a heavier average fill. This tool uses 120, the spoon-and-level standard. Whichever number a recipe was written around, follow that recipe’s own weights when it prints them.

How to use the cups of flour to grams

Type the cups your recipe calls for and read the grams; tap Swap to turn a gram weight from a metric recipe back into cups. The number this page works from is 120 grams per cup of all-purpose flour, and the qualifier attached to it is the entire point of the page: 120 grams is what a cup holds when the flour has been loosened, spooned in and levelled off. King Arthur Baking, whose test kitchen writes recipes around that figure, describes the technique as fluff, sprinkle and scrape, and states plainly that a cup can hold up to 160 grams when the flour is compacted instead. That is a third more flour arriving in the bowl from nothing but the way the cup was filled, and it is the single most common reason a home bake disappoints. Nothing about the filled cup looks any different in the two cases, which is exactly why it is worth spelling out.

Flour compresses because it is fine, dry and full of air. It settles under its own weight in the bag, it settles again when a truck carries it across the country, and it compacts hard when you push a metal cup down into it. Serious Eats has measured the resulting spread at four to six ounces a cup, roughly 113 to 170 grams, depending on how the cup is filled — with the spooning method landing near four and a half ounces and the dip-and-sweep method well above it. Those are not different flours or different cups. They are the same flour and the same cup, filled by two people who both believed they had measured accurately, and there is no visual cue in the finished measure to tell them apart. It is also why a recipe that works perfectly for the person who wrote it can fail for a reader who followed every word: the words describe cups, and the oven responds to grams.

What too much flour does is add structure. Flour is starch and protein, and a bake is a negotiation between that structure and the water, fat, sugar and eggs surrounding it. Push the flour up by a third and every one of those ratios shifts at once: there is less moisture per gram of starch, more gluten available to toughen, and less sugar and fat to tenderise what forms. Cakes turn dense and dry, cookies puff up cakey and pale instead of spreading, pancakes go rubbery and bread crumb tightens. Because the over-measurement comes from technique rather than from misreading a number, it repeats faithfully every time you bake, which is why some cooks conclude a recipe is simply bad when what they actually have is a measuring habit. The effect compounds with scale, too. A one-cup pancake batter absorbs a small overshoot without complaint, but a five-cup bread dough multiplies the same technique error five times over, and by then the dough is telling you what went wrong long before the oven gets a chance to.

If you keep using cups, use the spoon-and-level method every single time, and never dip, tap or press. But the honest advice for flour specifically is to weigh, because it is usually the largest ingredient in the bowl and therefore the one where a percentage error does the most damage. A scale also removes an argument the recipe cannot settle for you. Note that this page is for all-purpose flour; the tool carries bread flour at the same 120 grams a cup and whole-wheat at 113 grams, and swapping between flours changes protein content and water absorption as well as weight: bread flour builds more gluten and whole-wheat drinks more liquid, so neither is a straight exchange even when the grams match. If you bake at all often, the fastest improvement available to you is not a better recipe or a better oven but a flat scale on the counter and the habit of reaching for it first. The values here use a 240 ml cup, spoon-and-level.

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