Cups to Pounds Converter

Cups measure volume and pounds measure mass, so density connects them. The conversion runs cups to milliliters using the selected cup standard, milliliters to grams using density, and grams to pounds using the exact 453.59237 g per pound factor. For example, one 240 mL US legal cup of water and one of honey have the same volume but different weights.

They occupy the same volume, but their densities differ. Using one 240 mL US legal cup makes the volume assumption explicit. The converter then applies the selected ingredient's density before converting grams to pounds.

A US customary cup is 236.5882365 mL, exactly 8 US fluid ounces. A US legal cup is 240 mL and is used for nutrition labeling. A metric cup is 250 mL. Select the standard used by your source because the cup volume changes the converted weight.

Bulk-bin and produce shopping often happens in two units at once. A recipe says '2 cups dried rice', the bulk bin sells by the pound, and the scoop is unlabeled. Knowing that 1 cup of uncooked rice weighs about 0.45 lb means 2 cups is roughly 0.9 lb, so you fill the bag until the scale reads close to a pound. The same shortcut works for flour (1 cup all-purpose is about 0.28 lb sifted, 0.31 lb scooped), granulated sugar (1 cup is about 0.45 lb), and rolled oats. Going the other direction is just as useful: a 2 lb bag of granulated sugar holds about 4.5 cups, a 5 lb bag of flour holds about 18 cups sifted, and a 12 oz bottle of honey (0.75 lb) holds about 1 cup. Both numbers are pre-cooking checks that keep you from buying too much or too little.

Because a kitchen scale removes the technique variable. The same cup of flour weighs anywhere from about 120 g (sifted then spooned) to about 150 g (dipped and scooped straight from the bag), a 25 percent spread for the same product. In pounds, that is the difference between 0.265 lb and 0.331 lb of flour going into a single cup measurement, which can over- or under-flour a recipe enough to dry out cookies or sink a cake. King Arthur Baking, America's Test Kitchen, Serious Eats, and most professional pastry kitchens publish gram and pound weights alongside cup figures for exactly this reason. Weighing is also faster (one bowl on a scale with the tare button zeroes between additions), more sanitary (the scoop never touches the bag), and trivially scalable for half and double batches. Cup measurement survives in home baking on inertia, not on accuracy.