Calculate how many pounds are in any number of cups for flour, sugar, butter, and other ingredients, or convert pounds back to cups using an editable mass-per-cup estimate.
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Cups to Pounds Formula
To convert cups to pounds, multiply the number of recipe cups by the ingredient mass-per-cup estimate in grams per recipe cup, then divide by 453.59237 (the number of grams in one pound):
P = (C \times D) \div 453.59237
To convert pounds back to cups, reverse the formula:
C = (P \times 453.59237) \div D
Where:
P is the weight in pounds (lb).
C is the volume in cups.
D is the mass per recipe cup in grams. It varies with ingredient, product and measuring method. Choose a reference or enter your own measured factor. Cups measure volume; avoirdupois pounds measure mass.
453.59237 is the fixed number of grams in one pound and never changes.
Ingredient Weight Reference
The table below lists approximate recipe-cup factors from the King Arthur Baking ingredient chart, scaling partial-cup entries to one cup. Water instead uses a 236.5882365 mL US customary cup at an assumed 1 g/mL. Recipe conventions differ; these editable estimates are not universal densities.
| Ingredient | Grams per Cup | Pounds per Cup |
|---|---|---|
| All-Purpose Flour | 120 | 0.265 |
| Unbleached Cake Flour | 120 | 0.265 |
| Granulated Sugar | 198 | 0.437 |
| Brown Sugar (packed) | 213 | 0.470 |
| Powdered Sugar | 113 | 0.249 |
| Butter | 226 | 0.498 |
| Water | 236.588 | 0.522 |
| Fresh Milk | 227 | 0.500 |
| Vegetable Oil | 198 | 0.437 |
| Honey | 336 | 0.741 |
| Rice (long grain, uncooked) | 198 | 0.437 |
| Table Salt | 288 | 0.635 |
Example Problems
Example 1: You have 3 cups of all-purpose flour and want the weight in pounds. Flour weighs 120 grams per cup, so P = (3 x 120) / 453.59237 = 360 / 453.59237 = 0.794 pounds.
Example 2: A recipe calls for 2 pounds of granulated sugar and you want to measure it in cups. Using the sugar reference of 198 grams per recipe cup, C = (2 x 453.59237) / 198 = 907.18474 / 198 ≈ 4.582 cups.
Frequently Asked Questions
Why do I have to choose an ingredient? Cups measure volume while pounds measure weight, and every ingredient has a different density. One cup of flour weighs about 120 grams, but one recipe cup of honey is estimated at 336 grams, so the same number of cups gives a very different weight depending on what you are measuring.
How many cups are in a pound of flour? One pound of all-purpose flour is about 3.78 cups, found by dividing 453.59237 grams by 120 grams per cup.
Are these conversions exact? They use approximate recipe measures; they may not match your recipe or measuring method. The real weight of a cup can vary with how tightly you pack the ingredient, the brand, and humidity, so weigh on a scale when precision matters.
