Why can't I substitute powdered sugar for granulated sugar in most cakes?

The 3% cornstarch content absorbs moisture differently and can make the cake denser. Also, the fine texture doesn't create the same air pockets during creaming with butter, resulting in a less airy crumb.

Can I use powdered sugar to make caramel?

It is not recommended. The included cornstarch will burn at caramelization temperatures and prevent the sugar from melting into a clear liquid, resulting in a cloudy, scorched mixture.

Ingredient hub

Powdered sugar

By Fidamen-Chefsolver Team | Reviewed by Chefsolver Staff

Powdered sugar is finely ground granulated sugar, often with a small amount of cornstarch to prevent caking. It dissolves instantly, making it perfect for icings, frostings, and dusting.

Essential for smooth, non-gritty glazes, buttercream, and for stabilizing whipped cream. The included cornstarch helps prevent weeping and adds stability.

Quick convert

Ingredient

US cup = 236.588 mL
1 tbsp = 14.787 mL
1 tsp = 4.929 mL

Density source:USDA FoodData Central

Baking Conversion Chart

Exact cup-to-gram weights for flour, sugar, cocoa, and every baking ingredient. Print it, stick it up, bake with precision.

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Use Powdered sugar as a substitute for

Have this ingredient on hand? These are the situations where it can stand in for others.

Granulated sugar
To make 1 cup of powdered sugar, blend 1 cup of granulated sugar with 1 tablespoon of cornstarch until very fine. Note: Home blenders may not achieve the same fineness as commercial 10X sugar.

Sugars: packed vs loose

Sugars are hygroscopic and crystal size varies by brand. A packed cup can overshoot by 20%, collapsing cakes or making cookies spread. Weight guarantees the chemistry (Maillard, creaming) behaves as intended.

Brown sugar is typically packed; white/granulated should be loose unless stated.
Switch to weight for consistent sweetness across batches.

Why weigh sugar?Crystal size and packing change the true amount. Too much weakens gluten and can cause collapse; too little yields tough bakes.

Does powdered sugar behave differently?Yes. It contains starch and compacts drastically. Always weigh for frostings and shortcrusts.

How sugar impacts volume and color

Powdered sugar (GI ) caramelizes, holds moisture, and impacts browning. Type: .

Storage & tools

Store in a cool, dry pantry (under 21 °C / 70 °F) away from direct sunlight.
Use airtight containers to keep humidity out — dry ingredients gain 1–2 % mass in humid air.
Rotate stock: first in, first out, even when the product looks unchanged.
Check best-by dates; potency can fade before the product looks old.

Keep in an airtight container in a cool, dry place. If it clumps, sift it before use.

Sources: CDC · FDA

FAQ

Why can't I substitute powdered sugar for granulated sugar in most cakes?: The 3% cornstarch content absorbs moisture differently and can make the cake denser. Also, the fine texture doesn't create the same air pockets during creaming with butter, resulting in a less airy crumb.
Can I use powdered sugar to make caramel?: It is not recommended. The included cornstarch will burn at caramelization temperatures and prevent the sugar from melting into a clear liquid, resulting in a cloudy, scorched mixture.