If you’ve ever walked past the bakery aisle at Costco, you’ve probably wondered just how big that sheet cake really is. Is it worth the price? How many people can it feed? This guide answers those questions and gives you quick tips for picking, storing, and even decorating a Costco cake for any occasion.
A standard Costco 1/2 sheet cake measures about 12" × 18" and stands roughly 3‑4 inches tall. That translates to roughly 60‑70 square inches per serving if you cut 2‑inch squares. In practice, most bakers say you can serve 30‑40 people comfortably. If you need more plates, the full‑size sheet (about 24" × 18") can handle 60‑80 guests.
Remember, the exact number depends on how generous you want each slice. For a birthday party with kids, you can stretch it a bit more than for a formal adult gathering.
Costco keeps the price simple – a 1/2 sheet cake usually runs between £30‑£35, while the full sheet tops out at around £50‑£55. Compare that to a custom bakery cake of similar size and you’ll often see a 30‑40% cost saving. The trade‑off? You get fewer design options out of the box.
To get the most bang for your buck, ask the staff to add a simple frosting color or a basic “Happy Birthday” piped message. That small extra usually costs less than £5 and makes the cake look created just for you.
If you’re on a tight budget, pick the plain vanilla or chocolate options – they’re the most affordable and pair well with any frosting or topping you bring from home.
Here are three quick tips to make your Costco cake work for you:
Got a theme? You can use simple edible decorations like cake toppers, themed candles, or even a sheet of fondant cut to size. Because Costco cakes have a flat top, they’re perfect canvases for DIY designs.
In short, a Costco cake gives you a large, affordable base that you can shape to fit any party. Whether you’re feeding a crowd of friends, celebrating a milestone, or just craving a budget‑friendly treat, the sheet cake from Costco is a reliable go‑to.
Need more specifics? Check out our post “How Many People Can a Costco 1/2 Sheet Cake Feed?” for detailed serving charts and cutting guides.
Wondering if Costco will write a name on your birthday cake? This article breaks down how Costco handles cake customization, what you can expect when ordering, and some tips for getting the cake you want. You'll find straight answers about the process, pricing, and options. You'll also learn about common mistakes and fun facts that might surprise you. Perfect if you need a quick rundown before your next party.
