A Cup of Flour in Grams: All-Purpose, Bread, Cake

Recipes call for a cup of flour, then bakers wonder how much that really weighs. The short answer is that one cup of all-purpose flour is about 120 grams, or 4.25 ounces, using King Arthur Baking's standard. Once you know a cup of flour in grams, you can weigh instead of scoop and get the same loaf every time.

Volume is where baking quietly goes wrong. Depending on how you fill the cup, grams in 1 cup of flour can swing from 110 all the way to 165. That 55 gram gap is nearly half a cup of extra flour, enough to turn a tender cake dry and heavy.

How Many Grams in a Cup of Flour?

So a cup of flour how many grams should you count on? For all-purpose flour, 120 grams per cup is the modern American baking standard, matching what King Arthur uses across its recipes. On a kitchen scale that reads as 4.25 ounces.

The catch is that flour compacts. FlourWise weighed one cup four times and got 118, 132, 141, and 155 grams, all from the same bag. The number you land on depends entirely on how the flour got into the cup.

One cup of flour can weigh anywhere from 110 grams sifted to 165 grams scooped, a difference of nearly half a cup.

A Cup of Flour in Grams by Type

Not every flour weighs the same per cup. Protein content and milling change how the grains pack, so a cup of flour in grams shifts with the type you pull off the shelf. Here is how King Arthur charts the common ones.

Whole wheat and self-rising flour sit lighter at 113 grams per cup, while pastry flour is the featherweight at 106 grams. For bread flour cup to grams, King Arthur lists 120 grams, the same as all-purpose, even though bread flour carries more protein.

Bread flour and cake flour weights

Bread flour and all-purpose flour both weigh 120 grams per cup on the King Arthur chart, so you can swap the weight straight across. Cake flour is milled finer and often measures lighter in practice, closer to 106 grams when you spoon it gently rather than pack it.

Cups to Grams Flour Conversion Chart

Once you trust the 120 gram base, cups to grams flour math is simple multiplication. Two cups of flour grams add up to 240 grams, and 3 cup flour in grams reaches 360 grams. Scale any recipe by holding that 120 gram anchor in mind.

Going the other way, if a European recipe asks for 500 grams, that is 500 gm flour to cups, or about 4.17 cups of all-purpose. Keep a cups to grams converter handy so flour cups to g never slows you down mid-recipe.

Why Scooping Wrecks Your Measurement

The classic mistake is dipping the cup straight into the bag. Webstaurant warns that this packs the flour and knocks the air out, so you can scoop almost double what a recipe intends without noticing.

The spoon and level method

The fix takes ten seconds and no special tools. Fluff, spoon, and level, and your cup lands near the 120 gram target instead of drifting up to 155 grams of packed flour.

Dipping the cup into the bag can pack in nearly twice the flour a recipe calls for, the fastest way to ruin a bake.

Weigh Flour Instead of Measuring Cups

The surest cure for flour drift is a scale. Set the bowl on it, zero it out, and add flour until it reads 120 grams. Now grams of flour in one cup is exact, not a guess, and every bake repeats the same way.

A scale also makes unit swaps painless. Weigh in grams, then use a grams to ounces converter if your recipe is imperial. The same habit that fixes flour helps with sugar and spices, where a cup of granulated sugar runs 198 grams.

Flour Weight Questions

How many grams to a cup of flour?

For all-purpose flour, count on 120 grams per cup, or 4.25 ounces. Bread flour matches at 120 grams, whole wheat runs lighter at 113 grams, and pastry flour is 106 grams per cup.

Cup of flour how many grams when sifted?

Sifting adds air, so a sifted cup drops to about 110 grams. If a recipe says to sift and then measure, expect 110 to 115 grams rather than the standard 120 grams.

How many grams in a cup of flour for bread?

King Arthur lists bread flour at 120 grams per cup, the same as all-purpose. The protein is higher, but the weight per cup is identical, so bread flour cup to grams stays at 120.

Stop guessing whether your cup of flour is 110 grams or 160. Scale for Grams reads the weight of flour, sugar, or any ingredient from a single photo, so you can bake by grams without digging out a scale. Get the app here: iOS.