Cups to Pounds Converter
Volume and weight are not interchangeable: one cup of flour weighs far less than one cup of honey. This converter looks up the density of your chosen ingredient and does the math, so you never have to wonder again. Pick your ingredient, enter either cups or pounds, and the other value appears instantly. Switch between US cups, metric cups (250 mL), and UK imperial cups, or enter a custom density for any unlisted ingredient.
Why cups and pounds are not directly interchangeable
A cup is a unit of volume (how much space something occupies), while a pound is a unit of mass (how much matter it contains). The conversion factor between them depends entirely on the density of the ingredient. Water has a density of about 236.6 g per US cup, but all-purpose flour has only 125 g per cup because its particles trap air. That means the same cup volume holds nearly twice as much water by weight as it holds flour. This is why baking recipes that call for "two cups of flour" can produce inconsistent results: how you fill the cup changes the weight by 20-30%, while a scale always gives the exact same measurement.
How this converter calculates the result
The converter stores the density of each ingredient in grams per US cup. For a cups-to-pounds conversion, it first adjusts for cup type (US = 236.6 mL, metric = 250 mL, UK = 284.1 mL), then multiplies the cup count by the density to get grams, and finally divides by 453.592 to convert grams to pounds. For a pounds-to-cups conversion, the process runs in reverse: multiply pounds by 453.592 to get grams, divide by the ingredient density to get US cups, then scale to the selected cup type. Ounces and grams are shown alongside pounds so you can use whichever unit your scale or recipe requires.
US cups, metric cups, and UK cups: what is the difference?
Three different cup standards are in common use. The US customary cup is 236.588 mL (half a US pint). The metric cup, used in Australia and Canada, is exactly 250 mL, about 5.7% larger than the US cup. The UK / imperial cup is 284.131 mL (half an imperial pint), about 20% larger than the US cup. A recipe from an Australian cookbook that calls for "2 cups of flour" is asking for a meaningfully larger amount than a US recipe using the same language, so matching the cup type to the recipe origin matters.
Tips for accurate measurement in baking
For most baked goods, a digital kitchen scale beats cup measures on accuracy and reproducibility. The spoon-and-level method for dry ingredients (spoon flour gently into the cup, then scrape the top flat with a knife) gives the density values shown in this converter. Scooping the cup directly into the flour bag compacts the flour and can add 20-40 g per cup, enough to make bread dense or cookies dry. Liquids are more predictable in a cup than dry goods, but a scale is still more reliable. If your recipe lists both weight and volume, always prefer the weight.
Common ingredient densities and cup-to-pound conversions
| Ingredient | g per US cup | Cups per pound | lb per cup |
|---|---|---|---|
| Water | 236.6 | 1.92 | 0.522 |
| Milk (whole) | 244.0 | 1.86 | 0.538 |
| Butter | 227.0 | 2.00 | 0.500 |
| Oil (vegetable) | 218.0 | 2.08 | 0.481 |
| Honey | 339.0 | 1.34 | 0.748 |
| Maple syrup | 315.0 | 1.44 | 0.695 |
| Flour (all-purpose) | 125.0 | 3.63 | 0.276 |
| Flour (bread) | 127.0 | 3.57 | 0.280 |
| Flour (cake) | 100.0 | 4.54 | 0.220 |
| Flour (whole wheat) | 120.0 | 3.78 | 0.265 |
| Sugar (granulated) | 200.0 | 2.27 | 0.441 |
| Sugar (brown, packed) | 220.0 | 2.06 | 0.485 |
| Sugar (powdered) | 120.0 | 3.78 | 0.265 |
| Oats (rolled) | 90.0 | 5.04 | 0.198 |
| Rice (uncooked) | 185.0 | 2.45 | 0.408 |
| Salt (table) | 288.0 | 1.57 | 0.635 |
| Cocoa powder | 85.0 | 5.33 | 0.188 |
| Peanut butter | 258.0 | 1.76 | 0.569 |
| Chocolate chips | 170.0 | 2.67 | 0.375 |
Values are for room-temperature, unsifted dry goods and undisturbed liquids in a standard US cup (236.6 mL). Brown sugar is packed.
Frequently asked questions
How many cups are in a pound of flour?
For all-purpose flour (unsifted, spooned into the cup), 1 pound equals approximately 3.63 US cups. This varies by flour type: bread flour is about 3.57 cups per pound, cake flour is about 4.54 cups per pound, and whole-wheat flour is about 3.78 cups per pound. Sifted or compacted flour will give different results, so weighing is more reliable for baking.
How many cups are in a pound of sugar?
For granulated white sugar, 1 pound equals approximately 2.27 US cups. Brown sugar (packed) is denser at about 2.06 cups per pound, and powdered (icing) sugar is lighter at about 3.78 cups per pound. Always specify the sugar type in your recipe, since the conversions differ significantly.
How many cups are in a pound of butter?
Butter has a density close to that of water once melted, but in solid form it packs well. Standard butter is about 2 US cups per pound, meaning one pound (4 sticks in the US) equals 2 cups. One stick of butter is therefore 0.5 cup or 8 tablespoons.
Why do different calculators give slightly different values?
Ingredient densities vary depending on brand, temperature, moisture content, and how the ingredient is measured. The values in this converter are based on widely cited food science references for room-temperature ingredients measured using the spoon-and-level method. Packed, sifted, or aerated measurements will shift results by 10-25%. Treat any cups-to-pounds conversion as a close approximation and weigh critical baking ingredients for best results.
Can I use this converter for liquids?
Yes. Liquids such as water, milk, cream, oil, honey, and maple syrup are all included. Liquids are more consistent than dry goods because they always fill the cup uniformly, so the conversion is more reliable. Note that the converter uses the liquid at its standard room-temperature density; very warm or chilled liquids may differ slightly.
What is the difference between a US cup and a metric cup?
A US cup is 236.588 mL, while a metric cup (used in Australia, Canada, and other countries) is 250 mL. That makes a metric cup about 5.7% larger. For most cooking this difference is negligible, but for baking it can matter. This converter lets you select which cup type your recipe uses.
My ingredient is not on the list. What should I do?
Select "Custom ingredient" from the dropdown and enter the density in grams per US cup. If you know the density in g/mL, multiply by 236.588 to get g/cup. Many specialty food manufacturers list density on their packaging or websites. A kitchen scale can also help you measure it directly: fill a cup, weigh it, and enter that value.