How Many Grams in a Cup of Powdered Sugar?
Updated September 25, 2026
1 US cup of powdered sugar
113g
4 oz, spooned into the cup unsifted and leveled
- 1/2 cup
- 57 g
- 1/4 cup
- 28 g
- 1 tablespoon
- 7.1 g
- 1 teaspoon
- 2.4 g
One cup of powdered sugar (confectioners' sugar) weighs about 113 grams (4 ounces) when spooned into the cup unsifted. That's only a little more than half the weight of a cup of granulated sugar, so the two can't be swapped cup-for-cup.
Powdered Sugar converter
Fractions work too, for example 1/3 or 1 1/2.
Cups to grams
| US cups | Grams | Ounces |
|---|---|---|
| 1/8 cup | 14 g | 0.5 oz |
| 1/4 cup | 28 g | 1 oz |
| 1/3 cup | 38 g | 1.3 oz |
| 1/2 cup | 57 g | 2 oz |
| 2/3 cup | 75 g | 2.7 oz |
| 3/4 cup | 85 g | 3 oz |
| 1 cup | 113 g | 4 oz |
| 1 1/2 cups | 170 g | 6 oz |
| 2 cups | 226 g | 8 oz |
| 3 cups | 339 g | 12 oz |
| 4 cups | 452 g | 15.9 oz |
Grams to cups
| Grams | Cups (decimal) | With measuring cups and spoons |
|---|---|---|
| 25 g | 0.22 | 3 tbsp + 1 1/2 tsp |
| 50 g | 0.44 | 1/3 cup + 1 tbsp + 2 tsp |
| 100 g | 0.88 | 3/4 cup + 2 tbsp + 1/2 tsp |
| 150 g | 1.33 | 1 1/4 cups + 1 tbsp + 1/2 tsp |
| 200 g | 1.77 | 1 3/4 cups + 1 tsp |
| 250 g | 2.21 | 2 cups + 3 tbsp + 1 tsp |
| 300 g | 2.65 | 2 1/2 cups + 2 tbsp + 1 1/2 tsp |
| 400 g | 3.54 | 3 1/2 cups + 2 tsp |
| 500 g | 4.42 | 4 1/3 cups + 1 tbsp + 1 1/2 tsp |
| 1,000 g | 8.85 | 8 3/4 cups + 1 tbsp + 2 tsp |
Sifted or unsifted?
Sifting fluffs powdered sugar with air, so a cup of sifted powdered sugar holds noticeably less sugar than an unsifted cup.
Pay attention to word order. "1 cup powdered sugar, sifted" means measure first, then sift. "1 cup sifted powdered sugar" means sift first, then measure, which gives you less sugar.
Tips for measuring powdered sugar
- In the US, powdered sugar usually contains a small amount of cornstarch to keep it from caking. That's normal and doesn't change how you measure it.
- For frostings and glazes, weighing is especially helpful: a few extra grams of sugar can turn a pourable glaze into a thick paste.
- Powdered sugar absorbs moisture from the air and forms lumps. Sift or whisk it before using it in smooth frostings.
Frequently asked questions
How many cups are in a 1-pound box of powdered sugar?
A 1-lb (454 g) box holds about 4 cups of unsifted powdered sugar.
Is 10X sugar the same as powdered sugar?
Yes. "10X" is a label some US brands use for their finest powdered sugar, and it measures the same way.
How many grams are in 1/2 cup of powdered sugar?
Half a cup of powdered sugar weighs about 57 grams (2 ounces).
How many cups is 100 grams of powdered sugar?
100 g of powdered sugar is about 0.88 US cups, which you can measure as 3/4 cup + 2 tbsp + 1/2 tsp.
How many grams are in a tablespoon of powdered sugar?
One tablespoon weighs about 7.1 g, and one teaspoon about 2.4 g.
More cups-to-grams conversions
See every ingredient side by side in the baking ingredient weight chart, or convert cups, spoons and milliliters with the kitchen unit converter.
Sources and method
The cup weight on this page comes from King Arthur Baking's Ingredient Weight Chart, which lists powdered sugar as 1 cup, unsifted = 4 oz = 113 g. All other figures are calculated from that weight using a US customary cup (236.6 mL), 16 tablespoons per cup and 3 teaspoons per tablespoon. Using a 250 mL metric cup? Multiply the grams by about 1.06. Brand, humidity and measuring technique can shift real-world weights by a few percent, so weigh when precision matters.