390g Powdered Sugar in Cups
390 grams of powdered sugar is 3¼ cups — 120g per US cup. Large powdered-sugar weights are for layer-cake frostings and royal icing, where the sugar-to-fat ratio decides whether the icing sets or slumps.
How many cups is 390g of powdered sugar?
390 grams of powdered sugar equals:
Measuring by hand? That is 3 cups + 4 tablespoons. It is about 78% of a 500 g bag of powdered sugar.
Powdered sugar clumps and compacts in the bag. Sift or whisk it first, then spoon it into the cup — do not tap the cup down.
Grams to Cups Converter
Quick select
390 grams of Powdered Sugar is about 3¼ cups, using a 236.588 millilitre cup at 120 grams per cup.
Reading
- cups
- 3.25
- tbsp
- 52.0
- tsp
- 156.0
See the full 390g to cups guide →
See 390g powdered sugar to cups →
US customary cup (236.588ml) · 120g per cup
Dedicated conversion guides use the default US customary cup.
Applies to this page only — the database value (120g per US cup) is unchanged.
390g of powdered sugar vs other ingredients
Grams measure weight and cups measure volume, so the same 390 grams fills a different amount of cup for every ingredient:
| Ingredient | 390g in cups | g per cup |
|---|---|---|
| Powdered Sugar | 3¼ cups | 120 |
| All-Purpose Flour | 3⅛ cups | 125 |
| Granulated Sugar | 2 cups | 200 |
| Butter | 1¾ cups | 227 |
See all 390g conversions on the 390 grams to cups chart.
Nearby powdered sugar amounts
| Grams of powdered sugar | Cups | Tablespoons |
|---|---|---|
| 340g | 2⅞ cups | 45 tbsp |
| 350g | 2⅞ cups | 47 tbsp |
| 360g | 3 cups | 48 tbsp |
| 375g | 3⅛ cups | 50 tbsp |
| 400g | 3⅓ cups | 53 tbsp |
| 410g | 3⅜ cups | 55 tbsp |
| 420g | 3½ cups | 56 tbsp |
| 450g | 3¾ cups | 60 tbsp |
Full ladder on the powdered sugar grams to cups chart.
Frequently Asked Questions
How many cups is 390g of powdered sugar?
390 grams of powdered sugar is 3¼ cups. In kitchen measures that is 3 cups + 4 tablespoons, worked out from 120 grams per US cup.
How many grams are in 1 cup of powdered sugar?
One US cup of powdered sugar weighs about 120 grams, one tablespoon about 7.5 grams, and one teaspoon about 2.5 grams. This page divides 390 grams by that cup weight.
Is 390g of powdered sugar the same as 390g of all-purpose flour?
No. 390g of powdered sugar is 3¼ cups, while 390g of all-purpose flour is 3⅛ cups. Same weight on the scale, different volume in the cup, because the two have different densities.
How do I measure 390g of powdered sugar without a scale?
Use 3 cups + 4 tablespoons. Powdered sugar clumps and compacts in the bag. Sift or whisk it first, then spoon it into the cup — do not tap the cup down.
Is it better to weigh powdered sugar or measure it in cups?
Weighing is more accurate, especially in baking, because it removes the variation in how the powdered sugar is packed into the cup. If you have no scale, use the cup figure above and keep your measuring method consistent across the whole recipe.