Quarter Sheet Cake: How Many People Does It Serve?

A quarter sheet cake is a rectangular cake baked in a shallow pan, usually about 9 by 13 inches at home or 13 by 9 inches, depending on how the pan is measured. A standard cake this size serves about 12 to 20 people: cut larger pieces for a small gathering or smaller squares when serving a crowd.

The guide below includes a simple vanilla cake and buttercream sized for a 9-by-13-inch pan. It makes 15 moderate servings, with practical cutting advice for adjusting the count without changing the recipe.

Ingredients

2 cups (250 g) all-purpose flour, spooned into the cup and leveled
1½ cups (300 g) granulated sugar
2 teaspoons (8 g) baking powder
½ teaspoon (3 g) baking soda
½ teaspoon (3 g) fine salt
½ cup (113 g) unsalted butter, softened
2 large eggs (about 100 g without shells), at room temperature
2 teaspoons (10 ml) vanilla extract
1 cup (240 ml) buttermilk, at room temperature
For the frosting: 1 cup (227 g) unsalted butter, softened
4 cups (480 g) powdered sugar, sifted if lumpy
2 teaspoons (10 ml) vanilla extract
2–3 tablespoons (30–45 ml) milk or cream
⅛ teaspoon (about 1 g) fine salt, or to taste
Optional: 2 tablespoons (15 g) sprinkles

Instructions

Prepare the pan and oven. Heat the oven to 350°F (175°C). Grease a 9-by-13-inch metal baking pan, line the bottom with parchment if convenient, and lightly grease the parchment. Let the eggs and buttermilk lose their chill while you measure the other ingredients.
Combine the dry ingredients. Whisk the flour, sugar, baking powder, baking soda, and salt in a large bowl until evenly mixed. Add the softened butter and beat on low until the mixture looks sandy and no large butter pieces remain, about 1 minute.
Make the batter. In a small bowl, whisk together the eggs, vanilla, and buttermilk. Pour about half into the flour mixture and beat on medium for 30 seconds, scraping the bowl. Add the remaining liquid in two additions, mixing briefly after each, just until the batter is smooth. Avoid beating longer than needed.
Bake the cake. Spread the batter evenly in the prepared pan. Bake for 28–32 minutes, rotating the pan once if your oven has hot spots. The cake is ready when its center springs back lightly and a toothpick inserted in the middle comes out clean or with a few moist crumbs. If checking with a thermometer, the center should reach at least 200°F (93°C); this is a quality check for cake, not a meat-safety temperature. Cool in the pan for 15 minutes, then cool completely before frosting, about 45 minutes more.
Mix the frosting. Beat the softened butter on medium until creamy, about 2 minutes. Add the powdered sugar in several additions on low speed. Beat in the vanilla, salt, and 2 tablespoons (30 ml) milk or cream. Increase the speed and beat for 1–2 minutes; add the final tablespoon of liquid a little at a time if you want a softer, spreadable frosting.
Frost and cut. Spread frosting over the completely cooled cake and add sprinkles if desired. For 15 servings, cut the short side into 3 strips and the long side into 5 strips. For clean edges, use a long knife and wipe it between cuts.

Tips

Check your pan size. A home-style 9-by-13-inch pan is often called a quarter sheet cake pan, but commercial quarter-sheet pans are commonly around 13 by 9 inches. Pan depth and exact dimensions vary; this batter is intended for a pan at least 2 inches deep. Do not fill a shallow pan to the brim.
Measure flour lightly. Scooping directly with a measuring cup can pack in too much flour and make the crumb dry. Spoon flour into the cup and level it, or weigh 250 g.
Use room-temperature ingredients. Cold buttermilk or eggs can make the butter mixture look curdled and the batter less even. If needed, warm the buttermilk briefly by setting its container in lukewarm water; do not heat it until hot.
Choose a buttermilk substitute if needed. Stir 1 tablespoon (15 ml) lemon juice or white vinegar into a measuring cup, add milk to reach 1 cup (240 ml), and let stand for 5 minutes. The cake may be slightly less tender and tangy than with cultured buttermilk.

Serving Suggestions

For a birthday or dessert table, 15 pieces are a useful middle ground: each is about 3 by 2.6 inches before trimming. For generous dessert portions, cut 12 pieces by making 3 strips across the 9-inch side and 4 along the 13-inch side. For a buffet with other sweets, make 20 pieces by cutting 4 strips one way and 5 the other. If you need 24 small party portions, cut a 4-by-6 grid; these are bite-size servings rather than full slices.

Serve the cake at room temperature so the crumb and frosting are soft. Fresh berries, sliced strawberries, or a bowl of fruit make easy accompaniments. For a richer dessert, serve smaller pieces with coffee, tea, or a scoop of ice cream.

Variations

Chocolate cake: Replace ¼ cup (30 g) flour with ¼ cup (20 g) unsweetened cocoa powder. Sift the cocoa with the dry ingredients; the cake will have a mild chocolate flavor. For a stronger chocolate version, use a chocolate cake recipe scaled for a 9-by-13-inch pan rather than adding extra cocoa to this batter.

Lemon: Add 1 tablespoon (6 g) finely grated lemon zest to the sugar and rub it in with your fingertips before mixing. Replace 1 teaspoon of vanilla with 1 tablespoon (15 ml) lemon juice, then add only enough buttermilk to keep the total liquid close to 1 cup (240 ml).

Different frosting: Use cream cheese frosting or a simple glaze instead of buttercream. Cream cheese frosting is softer, so keep the cake refrigerated after decorating. A glaze gives a thinner, sweeter finish and uses less topping.

Storage and Reheating

Because the buttercream contains butter and dairy, refrigerate the frosted cake within 2 hours of serving. Cover the pan or transfer pieces to an airtight container; it keeps for 3–4 days refrigerated. For best texture, let a portion sit at room temperature for about 20–30 minutes before eating. Do not leave the cake out for more than 2 hours, or 1 hour if the room is above 90°F (32°C).

To freeze, wrap individual unfrosted or frosted pieces tightly and place them in a freezer-safe container for up to 2 months for best quality. Thaw overnight in the refrigerator, then allow to soften at room temperature before serving. Cake is generally served at room temperature rather than reheated; if you prefer it slightly warm, microwave an individual piece without foil for 5–8 seconds, checking carefully so the frosting does not melt.

Frequently Asked Questions

How many people does a quarter sheet cake serve?
A typical 9-by-13-inch cake serves about 12–20 people, depending on the size of each slice and whether it is the only dessert. This recipe is cut into 15 moderate portions. Small party squares can stretch it to 24 servings, while generous pieces yield about 12.

Is a 9-by-13-inch cake the same as a quarter sheet cake?
It is a common home version, but terminology varies. Commercial quarter-sheet pans are often close to 13 by 9 inches, while some home recipes call a 9-by-13-inch cake a quarter sheet. Check the actual pan dimensions and depth rather than relying on the name.

How many slices should I cut for a party?
Plan on 12–15 pieces for a sit-down dessert, 16–20 for a party with other food, or up to 24 small squares for a buffet. The right count depends on appetite, the other desserts available, and whether guests will take seconds.

Can I bake this in a different pan?
A similarly sized pan with at least 2-inch sides should work, but a smaller pan makes the cake deeper and increases baking time, while a larger pan makes it thinner and bakes faster. Do not fill a pan more than about two-thirds full; bake any extra batter separately in lined muffin cups.

Can I make the cake ahead?
Yes. Bake it a day ahead, cool completely, cover, and refrigerate; frost it once cool or the next day. You can also freeze the unfrosted cake for up to 2 months. Thaw it in the refrigerator before frosting to reduce condensation and keep the crumb intact.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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