1/3 Cup of Powdered Sugar in Grams
1/3 cup of powdered sugar weighs 40 grams (about 1.4 oz), based on 120 g per US cup (spoon-and-level method). That's the same as 5.3 tablespoons of powdered sugar. When a recipe's outcome depends on accuracy — especially baking — weigh it instead of measuring by cup.
1/3 cup is the awkward fraction: it does not divide into whole tablespoons, and halving it lands on 2 tablespoons + 2 teaspoons. Two scoops make 2/3 cup (80 g), three make a full cup (120 g).
How much is 1/3 cup of powdered sugar?
| Grams | 40 g |
|---|---|
| Ounces (weight) | 1.4 oz |
| Tablespoons | 5.3 tbsp |
| Teaspoons | 16 tsp |
| Density used | 120 g per US cup |
No 1/3 cup measure? Use spoons
1/3 cup is exactly 5 tablespoons + 1 teaspoon, which is 40 g of powdered sugar. Measuring spoons are stamped to a tighter tolerance than cups, so for small amounts the spoon route is usually the more accurate one even when you do own the cup.
Halving and doubling 1/3 cup
Scaling a recipe is the usual reason this conversion comes up, and grams scale cleanly where cup fractions do not:
| Recipe | Cups | Grams | Spoons |
|---|---|---|---|
| Half | ⅛ cup | 20 g | 2 tablespoons + 2 teaspoons |
| As written | ⅓ cup | 40 g | 5 tablespoons + 1 teaspoon |
| Double | ⅔ cup | 80 g | 10 tablespoons + 2 teaspoons |
Nearby amounts
| Cups | Grams | Ounces |
|---|---|---|
| ¼ cups | 30 g | 1.1 oz |
| ⅓ cups | 40 g | 1.4 oz |
| ½ cups | 60 g | 2.1 oz |
| ⅔ cups | 80 g | 2.8 oz |
Every cup fraction of powdered sugar in grams — the full chart.
How to measure 1/3 cup of powdered sugar
These values are for unsifted powdered sugar, spooned into the cup and leveled (120 g). If your recipe says "sifted powdered sugar," sift first and expect closer to 100 g per cup — sifting adds a lot of air.
1/3 cup of other ingredients
- 1/3 cup all-purpose flour in grams — 40 g
- 1/3 cup granulated sugar in grams — 67 g
- 1/3 cup brown sugar (packed) in grams — 71 g
- 1/3 cup honey in grams — 113 g
- 1/3 cup butter in grams — 76 g
Convert another amount
250 cups Powdered (icing/confectioners') sugar = 30000 g
Based on 120 g per US cup.
Reverse conversion: grams of powdered sugar to cups.
Density 120 g/cup — sources: USDA FoodData Central, King Arthur Baking ingredient weight chart. Data verified 2026-08-20. Methodology.