A level tablespoon of unsifted powdered sugar weighs about 7 to 7.5 grams. King Arthur Baking lists confectioners' sugar at 113 g per cup, or about 7.1 g per tablespoon, while Domino's label puts the grams in a tablespoon of powdered sugar at 7.5 g.
| Amount | Powdered sugar, unsifted |
|---|---|
| 1/4 tsp | 0.6 g |
| 1/2 tsp | 1.2 g |
| 1 tsp | 2.4 g |
| 1 tbsp | 7.1 g |
| 1/4 cup | 28.3 g |
| 1/2 cup | 56.5 g |
| 1 cup | 113 g |
Why the grams in a tablespoon of powdered sugar vary
Powdered sugar is granulated sugar ground into a fine powder, usually with a little cornstarch mixed in to stop caking. That fine texture is great for frosting, but it makes spoon measuring less reliable.
- Sifting. Sifted powdered sugar is full of air, so a spoonful weighs less than unsifted. The numbers above are for unsifted sugar.
- Packing. It settles hard in the bag and compresses when you scoop.
- Lumps. Humidity creates small clumps that add weight to a spoon.
- Brand. Domino lists 1/4 cup at 30 g, a bit heavier than King Arthur's 28.3 g for the same amount.
When a recipe says "1 cup powdered sugar, sifted," read it carefully. Sifting before measuring gives you less sugar than sifting after.
How to measure powdered sugar by the spoon
- Stir the sugar in the bag to loosen it.
- Spoon it lightly into your measuring spoon.
- Level it off with a knife.
- Sift it afterward if the recipe calls for that.
Weighing skips all of this. Once you know a tablespoon is roughly 7 g, you can weigh straight into the bowl, then sift.
If you're only dusting a cake, you don't need to measure at all. Tap the sugar through a small sieve until it looks right.
Using powdered sugar in small amounts
Plenty of recipes only need a spoonful or two:
- Simple glaze. A few tablespoons of powdered sugar stirred with a splash of milk or lemon juice.
- Whipped cream. A tablespoon or two sweetens it and helps it hold its shape.
- Dusting. Brownies, French toast and lemon bars just need a light shower.
- Small batch frosting. Scaled down recipes leave less room for error.
Glazes are where spoon by spoon control pays off most. Powdered sugar thickens liquid quickly, so the difference between a drizzly glaze and a thick icing can be just a tablespoon or two. Start with less sugar than you think, stir until smooth, and add more a little at a time until it coats the back of a spoon the way you like. Write down the amount that worked so you can repeat it next time.
Storage helps too. Keep powdered sugar sealed tight, because it pulls moisture from the air and forms hard lumps that make every spoonful heavier.
Common mistakes
- Swapping it for granulated sugar by volume. A tablespoon of granulated sugar weighs about 12 g, far more than powdered.
- Scooping from a packed bag. You'll get more than the recipe expects.
- Adding it all at once to a glaze. Add a spoonful at a time so you can adjust the thickness.
A practical tip for glazes: a MeasureMate digital measuring spoon scoops and weighs in one step, so you can add powdered sugar a few grams at a time. Tare it to zero, scoop, and read the display in 0.1 g steps. The removable spoon head makes cleanup quick when the fine powder gets everywhere.
Quick questions
How many grams is 1/4 cup of powdered sugar?
About 28.3 g by King Arthur Baking's chart, or 30 g according to Domino's label.
Does sifted powdered sugar weigh less?
Per spoon, yes. Sifting adds air, so the same spoon holds less sugar.
How many tablespoons of powdered sugar are in 100 grams?
About 13 to 14 tablespoons, depending on whether a spoonful is 7.5 g or 7.1 g.
Weights based on the King Arthur Baking ingredient weight chart and the Domino powdered sugar label.