Weight to volume needs the ingredient's density
A pound is a fixed mass; a cup is a fixed volume. To convert you divide the weight by how much a cup of that specific ingredient weighs. One pound of flour is about 3.6 cups; one pound of honey is about 1.3 cups, because honey is far denser.
One pound of common baking ingredients
| Ingredient | 1 lb | 2 lb | 5 lb |
|---|---|---|---|
| All-purpose flour | 3.63 cups | 7.26 | 18.1 |
| Bread flour | 3.49 cups | 6.97 | 17.4 |
| Cake flour | 3.94 cups | 7.89 | 19.7 |
| Granulated sugar | 2.27 cups | 4.54 | 11.3 |
| Brown sugar (packed) | 2.06 cups | 4.12 | 10.3 |
| Powdered sugar | 3.78 cups | 7.56 | 18.9 |
| Butter | 2.00 cups | 4.00 | 10.0 |
| White rice (raw) | 2.45 cups | 4.90 | 12.3 |
| Rolled oats | 5.04 cups | 10.1 | 25.2 |
| Honey | 1.33 cups | 2.67 | 6.67 |
| Cocoa powder | 5.34 cups | 10.7 | 26.7 |
| Peanut butter | 1.76 cups | 3.52 | 8.79 |
All values use the US cup (236.6 mL) and spoon-and-level measuring. An Imperial cup (284 mL) is about 20% larger, so it holds fewer cups per pound.
The mistakes that ruin a recipe
- Assuming one factor fits all. A pound of flour is 3.63 cups; a pound of honey is 1.33. That is nearly a 3x spread, so the ingredient matters more than anything else.
- Packed vs loose brown sugar. Packed is 2.06 cups per pound; loose is about 3.2. Recipes assume packed unless they say otherwise.
- Scooping flour instead of spooning. Scooping the cup straight into the bag packs in 15 to 20% extra. Spoon the flour in and level it off, as the density above assumes.
- Butter is the exception. One pound is exactly 2 cups, or 4 sticks, with no rounding. Half a stick is 1 tablespoon shy of a quarter cup, printed right on the wrapper.
Common questions
How many cups are in a pound?
It depends entirely on the ingredient, because a pound is weight and a cup is volume. A pound of all-purpose flour is about 3.6 cups, but a pound of honey is only about 1.3 cups. There is no single answer without knowing what you are measuring.
How many cups of flour in a pound?
About 3.6 cups of all-purpose flour, measured spoon-and-level. Bread flour packs slightly denser at 3.5 cups; cake flour is lighter at 3.9 cups.
How many cups of butter in a pound?
Exactly 2 cups, which is 4 sticks. Butter is the one ingredient with a clean, exact pounds-to-cups conversion, because US sticks are standardized at a quarter pound each.
Why is there no universal pounds-to-cups number?
A pound measures mass; a cup measures volume. To convert between them you need the ingredient density. A pound of sugar takes up less space than a pound of flour, so it fills fewer cups.
