How Many Grams Are in a Cup of Flour?

How many grams are in 1 cup of each flour type?

According to King Arthur Baking's ingredient weight chart, common flour types weigh different amounts per US cup. All-purpose flour weighs 120 g per cup. Bread flour weighs 120 g per cup. Whole wheat flour weighs 113 g per cup. Cake flour weighs 113 g per cup. Self-rising flour weighs 113 g per cup. Pastry flour weighs 113 g per cup. Almond flour weighs 96 g per cup. Coconut flour weighs 112 g per cup. Rye flour weighs 102 g per cup. Buckwheat flour weighs 120 g per cup. These weights assume properly measured cups: spooned into the cup and leveled, not scooped directly from the bag or packed in. Different scooping techniques can vary the actual weight by 20-30 percent, which is why baking benefits from weighing rather than measuring by cup.

Why does flour scooping method change the weight?

Flour is full of air pockets between particles. How you fill the measuring cup determines how compressed the flour becomes, which determines how much actually fits. Scooping directly from the bag (dipping the cup in) compacts the flour and can add 20-30 g per cup beyond the recipe's expectation. Spooning flour into the cup gently keeps the air pockets intact and gives 110-115 g per cup. Sifting before measuring gives the lightest result at about 105 g per cup. The standard 'cup of flour' in most US recipes assumes the spoon-and-level method at 120 g per cup. Recipes that say 'sifted flour' typically mean to sift before measuring, which gives a lighter cup. Recipes that say 'flour, sifted' typically mean measure first, then sift, which gives the standard weight.

How does flour weight scale through tablespoons and recipe amounts?

For all-purpose flour: 1 tsp is 2.5 g, 1 tbsp is 7.5 g, 1/4 cup is 30 g, 1/3 cup is 40 g, 1/2 cup is 60 g, 2/3 cup is 80 g, 3/4 cup is 90 g, and 1 cup is 120 g. For a standard recipe using 3 cups of flour: 360 g. A 5-pound bag of flour contains about 18-19 cups (5 lb times 16 oz divided by 4.25 oz per cup equals 18.8 cups, or about 2260 g). For bread baking, recipes often specify gram amounts directly because the precise flour-to-water ratio (hydration percentage) determines dough texture. A 70 percent hydration bread dough uses 700 g of water per 1000 g of flour, which can't be calculated accurately with cup measurements.

When does flour cup-to-gram math matter most?

Baking precision is the main case. Bread recipes use baker's percentages calculated from flour weight; cup measurements introduce 10-30 percent variability that ruins the math. Cookie spread, cake texture, and pastry structure all depend on accurate flour quantity. International recipes universally use grams for flour, making conversion necessary for European, Australian, and Asian baking sources. Restaurant and commercial baking standardizes on gram measurements for consistency across batches and bakers. Sourdough and laminated dough (croissants, puff pastry) require gram precision because the hydration ratio and butter-to-flour layers determine the final texture.