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

Powdered sugar contains 3% cornstarch, which absorbs liquid differently, making batters drier. Also, because it's so fine, it doesn't create the necessary air pockets when creamed with butter, resulting in a dense, heavy cake.

Can I make caramel with powdered sugar?

No. The cornstarch (anti-caking agent) burns at the high temperatures required for caramelization before the sugar melts properly, leaving you with a burnt, cloudy mess instead of clear amber caramel.

Ingredient hub

Powdered sugar

By Fidamen-Chefsolver Team | Reviewed by Chefsolver Staff

Powdered sugar is the most deceptive ingredient to measure by volume: a sifted cup can weigh half as much as a packed cup! Composed of pulverized sugar and a touch of cornstarch to prevent caking, precise measurement is non-negotiable. Our tool ensures you get the exact amount needed for silky frostings and tender shortcrusts, eliminating the guesswork.

Essential for grit-free glazes, silky buttercream, and tender shortbread. The added starch absorbs moisture and helps stabilize whipped cream.

What is Powdered sugar?

Powders and ground ingredients shift with grind size and packing pressure. A fluffed spoon can weigh far less than a scooped or pressed spoon, which is why gram values may seem high or low versus expectation. Keep your fill method consistent, then calibrate with weight.

Chef note:Professional bakers standardize one scoop style per recipe and trust grams for repeatability.

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.

See the Baking Chart

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
Emergency DIY: Blend 1 cup granulated sugar + 1 tbsp cornstarch on high until powdery. Note: It won't be as fine as commercial 10X sugar and may be gritty in frostings.

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.

Extremely sensitive to humidity. Store in an airtight container. If it hardens, blend it back to a powder, but always sift before using in frostings.

Sources: CDC · FDA

FAQ

Why can't I substitute powdered sugar for granulated sugar in cakes?: Powdered sugar contains 3% cornstarch, which absorbs liquid differently, making batters drier. Also, because it's so fine, it doesn't create the necessary air pockets when creamed with butter, resulting in a dense, heavy cake.
Can I make caramel with powdered sugar?: No. The cornstarch (anti-caking agent) burns at the high temperatures required for caramelization before the sugar melts properly, leaving you with a burnt, cloudy mess instead of clear amber caramel.