To convert cups of powdered sugar into pounds, multiply by 0.26455471: one cup comes to 0.26455471 pounds. Every ingredient has its own figure here, because the units are measuring different things and only the density links them.
The density behind that figure is 0.50721 g per mL, against 1.00 for water. A cup of water weighs 236.6 g and a cup of powdered sugar weighs 120 g, so this ingredient is 50.72% as heavy as the same volume of water — the single fact the whole page rests on.
A cup of powdered sugar is 120 g when it is measured the standard way, but how it gets into the cup changes the answer: between about 108 g and 144 g covers the range from lightly spooned to firmly packed. That 20% spread is larger than most of the adjustments recipes fuss over, and it disappears entirely the moment the ingredient is weighed instead.
Pounds are how powdered sugar is bought rather than cooked, so this is the bag-size arithmetic: one pound is 3.78 cups, a 2 lb pack is 7.56 cups and a 5 lb sack is 18.9. That last figure is the one worth knowing before a large bake — it tells you whether one bag covers the recipe.
What the number depends on: Sifted. Scooped unsifted it runs 10 to 15% heavier because it clumps around the anti-caking starch.
The formula
cups- The amount of powdered sugar you are converting, in cups
0.264554714622- Pounds per cup for powdered sugar, from its density of 0.50721 g/mL
pounds- The equivalent quantity in pounds
How it works, step by step
- Enter the quantity in cups.
- It is multiplied by 0.264554714622, the pounds-per-cup figure for powdered sugar.
- The result appears in pounds, with a second reading in g beneath it.
- Use the measure table if you want a standard recipe quantity rather than a number you type in.
Worked examples
1/3 cup of powdered sugar in pounds
Take 1/3 cup of powdered sugar: 0.333333 × 0.26455471 gives 0.0881849 pounds. Doubling the batch takes it to 0.17637 pounds, because the relationship is a straight proportion once the density is known.
3/4 cup of powdered sugar in pounds
A recipe calling for 3/4 cup of powdered sugar needs 0.198416 pounds on the scale. The arithmetic is 0.75 × 0.26455471 = 0.19841604, and halving the recipe halves the weight to 0.099208 pounds.
3 cup of powdered sugar in pounds
A recipe calling for 3 cup of powdered sugar needs 0.793664 pounds on the scale. The arithmetic is 3 × 0.26455471 = 0.79366414, and halving the recipe halves the weight to 0.396832 pounds.
How to read your score
Frequently asked questions
How many pounds are in 1 cup of powdered sugar?
One cup of powdered sugar is 0.26455471 pounds. Half that quantity is 0.132277 pounds and double it is 0.529109 pounds, so the figure scales straight up and down — there is no offset in this conversion, only the factor.
Why is a cup of powdered sugar not 236 g like water?
Because weight per cup depends on what is in the cup. Powdered sugar has a density of 0.50721 g per mL where water has 1.00, so a cup of it weighs 120 g rather than 236.6 g. That is a difference of 116.6 g per cup, and it is the reason a single volume-to-weight factor cannot be applied to every ingredient.
Does how I measure it change the weight?
Yes, and by more than most people expect. Handling changes the weight of a cup of powdered sugar by roughly 20% — about 12 g either side of 120 g — because sifted. Weighing removes the question entirely.
Is a fluid ounce of powdered sugar the same as an ounce?
No. A fluid ounce is a volume — one eighth of a US cup, 29.57 mL — and an ounce is a weight. One fluid ounce of powdered sugar weighs 0.5291 oz, so the two readings differ by 47.1%. They coincide only for something with the density of water, and then only roughly.
Is this a US cup or a metric cup?
US customary: 236.59 mL, which is the cup every US recipe means. A metric cup is 250 mL, so the same cup of powdered sugar would weigh 126.8 g instead of 120 g — 6.8 g more, or 5.67%. Australian and some European recipes use the metric cup, and the difference is large enough to matter in baking.
Do I need a scale for this, or will measuring cups do?
A scale, if the result matters. Volume measuring carries a spread of about 20% for powdered sugar — roughly 24 g on a 120 g cup — while a domestic scale is accurate to a gram or two. For anything where the ratio of ingredients drives the outcome, bread and pastry above all, weigh it.
How many cups of powdered sugar is 1 lb?
1 lb of powdered sugar is 3.7799 cups — 3.77994 cups to one pound, so 1 × 3.77994 = 3.7799. Going that way is a division by 0.264555, or a multiplication by 3.77994 if you prefer.
Powdered sugar in cups and pounds
| Cups | Pounds | Unrounded |
|---|---|---|
| 1/8 cup | 0.0330693 lb | 0.03306933933 |
| 1/4 cup | 0.0661387 lb | 0.06613867866 |
| 1/3 cup | 0.0881849 lb | 0.08818490487 |
| 1/2 cup | 0.132277 lb | 0.1322773573 |
| 2/3 cup | 0.17637 lb | 0.1763698097 |
| 3/4 cup | 0.198416 lb | 0.198416036 |
| 1 cup | 0.264555 lb | 0.2645547146 |
| 1 1/2 cup | 0.396832 lb | 0.3968320719 |
| 2 cup | 0.529109 lb | 0.5291094292 |
| 3 cup | 0.793664 lb | 0.7936641439 |
| 4 cup | 1.05822 lb | 1.058218858 |
Based on 120 g per cup of powdered sugar. One cup of powdered sugar is 0.26455471 pounds.
| Measure | Grams | Ounces | Millilitres |
|---|---|---|---|
| 1 cup | 120 g | 4.23 oz | 236.6 mL |
| 3/4 cup | 90 g | 3.17 oz | 177.4 mL |
| 2/3 cup | 80 g | 2.82 oz | 157.7 mL |
| 1/2 cup | 60 g | 2.12 oz | 118.3 mL |
| 1/3 cup | 40 g | 1.41 oz | 78.86 mL |
| 1/4 cup | 30 g | 1.06 oz | 59.15 mL |
| 1 tbsp | 7.5 g | 0.265 oz | 14.79 mL |
| 1 tsp | 2.5 g | 0.0882 oz | 4.929 mL |
US customary measures: 1 cup = 236.59 mL, 1 tbsp = 14.79 mL, 1 tsp = 4.93 mL.
| Ingredient | Grams per cup | Ounces per cup | Density (g/mL) |
|---|---|---|---|
| Cake flour | 114 g | 4.021 oz | 0.4818 |
| Whole wheat flour | 120 g | 4.233 oz | 0.5072 |
| Tapioca starch | 120 g | 4.233 oz | 0.5072 |
| Powdered sugar (this page) | 120 g | 4.233 oz | 0.5072 |
| All-purpose flour | 125 g | 4.409 oz | 0.5283 |
| Self-rising flour | 125 g | 4.409 oz | 0.5283 |
| Bread flour | 127 g | 4.48 oz | 0.5368 |
Ordered by weight. The spread across this group is why a single generic cups-to-grams factor cannot work.