Pounds to Cups Converter
Pounds are weight and cups are volume, so each ingredient has its own answer: 1 lb of flour is about 3¾ cups, 1 lb of sugar about 2¼, and 1 lb of butter exactly 2.
Example: with Weight (pounds) 1 · Ingredient All-purpose flour (120 g/cup) · Custom grams per cup 120 → Volume: 3.78 cups.
Computed by the calculator below using its default values. Change any input to see your own numbers.
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Check it outPounds to cups for common ingredients
Convert the pounds to grams (1 lb = 453.59 g), then divide by the ingredient’s grams-per-cup. One pound works out to about 3.78 cups of all-purpose flour, 2.27 cups of granulated sugar, 4 cups of powdered sugar, 2.45 cups of uncooked white rice, 1.92 cups of water — and exactly 2 cups of butter, since a 1-lb box is four 8-tablespoon sticks.
Scale up the same way: 4 lb of sugar is about 9.07 cups, and 4 lb of flour just over 15 cups, which is why a 5-lb flour bag (about 18.9 cups) lasts through so many bakes. The cups-plus-tablespoons row turns awkward decimals into something scoopable — 1 lb of flour shows as roughly 3 cups + 12 tbsp, i.e. 3¾ cups. Densities are for spooned-and-leveled measuring; packed cups weigh more, so treat volume conversions of dry goods as close estimates.
How it’s calculated
Cups = pounds × 453.59237 ÷ grams-per-cup, using the exact NIST pound. Grams-per-cup references: all-purpose flour 120 g and powdered sugar 113 g (King Arthur), granulated sugar 200 g, packed brown sugar 220 g, butter 227 g (half a pound by definition), water 236.588 g (1 cup = 236.588 mL), uncooked long-grain white rice 185 g (USDA). The breakdown row rounds the fractional cup to the nearest of the cup’s 16 tablespoons.
Results update as you type and are estimates, not professional advice — verify important decisions with a qualified professional.
Common mistakes
- Using one cups-per-pound figure for everything: flour needs 3.78 cups to make a pound, butter only 2.
- Packing flour or brown sugar differently than the reference — packed flour can shrink the true cups-per-pound by 20% or more.
- Reading lb as fl oz ladder math: pounds are weight; there is no fixed pounds-to-cups ratio without a density.
Frequently asked questions
How many cups are in a pound of flour?
About 3.78 cups of all-purpose flour, spooned and leveled at 120 g per cup — call it 3¾ cups in practice.
How many cups are in 4 pounds?
Depends on the ingredient: about 15.12 cups of flour, 9.07 cups of granulated sugar, or 8 cups of butter (four 1-lb boxes).
How many cups is a pound of butter?
Exactly 2 cups — a 1-lb package holds four sticks of 8 tablespoons (½ cup) each.
How many cups is a pound of powdered sugar?
About 4 cups unsifted, at 113 g per cup. Sifting fluffs it up to roughly 4½ cups per pound.
How do I convert cups back to pounds?
Multiply cups by the grams-per-cup and divide by 453.59: for example, 3 cups of sugar = 600 g ≈ 1.32 lb.