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Powdered Sugar — Ounces in Cups
1 ounce of powdered sugar equals 0.25 ( ~ 1/4) cups*
About powdered sugar measurements
Powdered (icing) sugar is extremely light, about 0.47 g/ml or just 112 g per US cup, because the milled crystals and cornstarch trap air. It clumps readily, so an unsifted, packed cup weighs well over a sifted one — recipes that call for 'sifted' are expecting the lighter measure.

Ounces of powdered sugar equivalent in cups?
FAQs on powdered sugar weight to volume conversion
1 ounce of powdered sugar equals how many cups?
1 ounce of powdered sugar is equivalent 0.25 ( ~ 1/4) cups.
How much is 0.25 cups of powdered sugar in ounces?
0.25 cups of powdered sugar equals 1 ounce.
Ounces to Cups of Powdered sugar Conversion Chart
Note: Fractions are rounded to common recipe fractions (1/8, 1/4, 1/3, 1/2, 2/3, 3/4…). Values are rounded to 3 significant figures.
| Ounces to cups of Powdered sugar | |
|---|---|
| 0.0158 cups | |
| 0.0317 cups | |
| 0.0633 ( ~ 1/8 ) cups | |
| 0.0844 ( ~ 1/8 ) cups | |
| 0.127 ( ~ 1/8 ) cups | |
| 0.169 ( ~ 1/8 ) cups | |
| 0.19 ( ~ 1/4 ) cups | |
| 1 ounce | 0.253 ( ~ 1/4 ) cups |
| 1 | 0.269 ( ~ 1/4 ) cups |
| 1 | 0.285 ( ~ 1/4 ) cups |
| 1 | 0.317 ( ~ 1/3 ) cups |
| 1 | 0.338 ( ~ 1/3 ) cups |
| 1 | 0.38 ( ~ 1/3 ) cups |
| 1 | 0.422 ( ~ 1/2 ) cups |
| 1 | 0.443 ( ~ 1/2 ) cups |
| 2 ounces | 0.507 ( ~ 1/2 ) cups |
| 2 | 0.522 ( ~ 1/2 ) cups |
| 2 | 0.538 ( ~ 1/2 ) cups |
| 2 | 0.57 ( ~ 1/2 ) cups |
| 2 | 0.591 ( ~ 2/3 ) cups |
| 2 | 0.633 ( ~ 2/3 ) cups |
| 3 ounces | 0.76 ( ~ 3/4 ) cups |
| 4 ounces | 1.01 ( ~ 1 ) cups |
| 5 ounces | 1.27 ( ~ 1 1/4 ) cups |
| 6 ounces | 1.52 ( ~ 1 1/2 ) cups |
| 8 ounces | 2.03 ( ~ 2 ) cups |
| 10 ounces | 2.53 ( ~ 2 1/2 ) cups |
References:
Weight to Volume Conversions - Recipes
A note on cooking ingredients measurements
Notes: results are rounded (by default) to 3 significant figures. Cooking conversions use standard ingredient densities — the exact weight varies slightly with the brand and how tightly the ingredient is packed ☺.