how many grams in a cup of arrowroot flour?

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things people ask

• How much does one cup of arrowroot flour weigh?
  Spoon-and-leveled, one cup is about 128 g. Arrowroot is finer and lighter than cornstarch by volume, so the same cup measure of cornstarch comes in heavier (around 130-140 g). For gluten-free flour blends where arrowroot stands in for 10-25% of the mix, the 128 g figure is the one most published GF baking books reference.
• Can I scoop arrowroot straight from the bag?
  You can, but the starch compresses readily and the cup ends up 145-150 g instead of 128 g. In a gluten-free cake or shortbread that already runs delicate, an extra 15-20 g of pure starch tightens the crumb and adds a faintly chalky mouthfeel. Sift or whisk the flour first, then spoon it into the cup.
• Does arrowroot flour swap cup-for-cup with cornstarch?
  Roughly, but not perfectly. By volume, 1 cup arrowroot (128 g) thickens about the same as 1 cup cornstarch by sight, though arrowroot gives a clearer, glossier finish and breaks down if boiled hard or held warm too long. For thickening, most cooks swap by weight at a 1:1 ratio and add the arrowroot off the heat.

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