Finely milled sugar with a touch of cornstarch, used for icings and dusting. One US cup weighs about 120g — almost exactly the same weight than a cup of all-purpose flour.
Powdered sugar is preselected below — just enter an amount.
The most commonly searched gram amounts, converted to cups automatically.
| Grams | Cups |
|---|---|
| 25g | 0.21 cups≈ ¼ cup |
| 50g | 0.42 cups |
| 75g | 0.63 cups≈ ⅔ cup |
| 100g | 0.83 cups |
| 125g | 1.04 cups≈ 1 cup |
| 150g | 1.25 cups≈ 1 ¼ cups |
| 200g | 1.67 cups≈ 1 ⅔ cups |
| 250g | 2.08 cups |
| 300g | 2.50 cups≈ 2 ½ cups |
| 500g | 4.17 cups |
| 1000g | 8.33 cups≈ 8 ⅓ cups |
Finely milled sugar with a touch of cornstarch, used for icings and dusting. It's also commonly labeled "confectioners sugar", "icing sugar".
Powdered sugar belongs to the Sugars group on GramToCup, alongside other ingredients measured the same way in most kitchens. It shows up most often in icing & frosting, dusting desserts, glazes. Its density of 120g per US cup is what this calculator uses to convert between grams and cups automatically — no manual lookup required.
Powdered sugar is a dry, milled or ground ingredient full of countless tiny air pockets between the particles. That trapped air is why it weighs relatively little for its volume — the exact weight shifts with how finely it's milled and how much it has settled in the container.
A cup of powdered sugar is almost exactly the same weight than a cup of all-purpose flour (125g/cup), even though both fill the same 1-cup measuring cup.
Common mistake: Measuring straight from the container without sifting first, which leaves clumps and traps extra weight in the cup.
Sift powdered sugar first to break up clumps, then spoon it into the measuring cup and level the top. Skipping the sift is the most common reason a cup ends up heavier than expected.
When a recipe needs to be exact, weigh it on a kitchen scale instead of using a measuring cup at all — it removes packing and settling from the equation entirely.
Store powdered sugar in a sealed container — humidity is the main reason the same cup can weigh differently from one day to the next.
100g of powdered sugar is approximately 0.83 cups, based on a density of 120g per US cup.
1 US cup of powdered sugar weighs about 120g. Use the calculator above to convert any other amount instantly.
Yes — "confectioners sugar" is another common name for powdered sugar. The density and conversion values on this page apply either way.
Because cups measure volume and grams measure weight. A cup of powdered sugar is almost exactly the same weight than a cup of all-purpose flour (125g/cup) because the two ingredients have different densities — see the density explanation above for why.
Sift powdered sugar first to break up clumps, then spoon it into the measuring cup and level the top. Skipping the sift is the most common reason a cup ends up heavier than expected.
They're in the same category, but check the density first: Granulated sugar weighs 200g per cup versus 120g for powdered sugar. Substituting by weight (grams) keeps a recipe accurate; substituting cup-for-cup can change the result if the densities differ much.