Substitute for Powdered Sugar (Confectioners' Sugar)
Very finely ground sugar used in frostings, glazes, and dusting.
The Best Substitute
The Professor's top pick for replacing powdered sugar (confectioners' sugar) is Granulated Sugar (blended) at a ratio of 1 cup granulated sugar + 1 tablespoon cornstarch, blended until powdery = 1 cup powdered sugar. This works well for frostings, glazes, dusting, all applications. Scroll down for complete details on every option, including what to use each one for and what to avoid.
Best Substitutes
Granulated Sugar (blended)
Flavor impact: Identical. This is literally how powdered sugar is made. The cornstarch prevents clumping.
Dairy-free
You can make powdered sugar in 30 seconds with a blender. Granulated sugar + a tablespoon of cornstarch, blend on high until powdery. Shake through a fine mesh sieve if any granules remain.
Frequently Asked Questions
Not in equal amounts. Powdered sugar is much lighter by volume. 1 3/4 cups powdered sugar roughly equals 1 cup granulated sugar by sweetness, but the texture of baked goods will differ.
The Bottom Line
If you are out of powdered sugar (confectioners' sugar), the best all-around substitute is granulated sugar (blended). Pay attention to the ratio, since substitutes rarely work at exactly 1:1. Consider what role powdered sugar (confectioners' sugar) plays in your recipe; whether it provides flavor, texture, acidity, or structure; and choose the substitute that best fills that specific role. When in doubt, start with less and adjust to taste.
Source: Culinary reference | Last verified: March 19, 2026 | Our methodology