Cake boxes look like the simplest thing you buy. Then a big order comes in, you reach for a box, and the 8-inch cake either rattles around in something far too big or won't fit past the icing without smudging it. Getting the size right the first time saves product, saves remakes, and saves the awkward moment at pickup.
Here is the plain-English guide to matching boxes and boards to your cakes.
What size cake box do I need for an 8-inch cake?
For a standard round 8-inch cake, use a 10 x 10 x 5 inch box. The rule behind it is simple: your box should be about two inches wider than the cake and tall enough to clear the decorations. That extra inch on each side lets the cake slide in without dragging the icing down the wall of the box, and leaves room for a board underneath.
Here is a quick reference for the most common round cakes:
- 6-inch cake needs an 8 x 8 x 5 inch box
- 8-inch cake needs a 10 x 10 x 5 inch box
- 10-inch cake needs a 12 x 12 x 6 inch box
- 12-inch cake needs a 14 x 14 x 6 inch box
When a cake falls between two box sizes, always size up. A little empty space is harmless; a squished buttercream flower is a remake.
Why "cake box sizes" are so confusing
Half the confusion comes from naming. Some suppliers name a box by the cake it holds, so an "8-inch cake box" is built to fit an 8-inch cake and its outside is closer to 10 inches. Others name the box by its actual outside measurement. When you are comparing two price lists, always check whether the number refers to the cake or the box itself before you order a full case.
Box height matters just as much as width. A standard two-layer cake sits comfortably in a 5-inch box. Once you are stacking a tall layer cake, adding a dome, or boxing a small tiered cake, jump to a 6-inch box so the lid closes without touching the top.
What size cake board goes under the cake?
Same rule, smaller margin: pick a board about two inches larger than the cake. A 6-inch cake goes on an 8-inch board, an 8-inch cake on a 10-inch board, a 10-inch cake on a 12-inch board. A cake sitting on a board its own size is far more likely to tip when it is carried; the extra edge gives your team something to grip and keeps the cake centered in the box.
Match the board thickness to the cake. Light sponges and chiffon cakes are fine on a thin single board. Dense mud cakes, fruit cakes, and anything tiered need a thick "drum" board so the base doesn't bow under the weight. If a cake is heavily decorated with fondant ruffles or fresh flowers, go three to four inches larger on the board to give the decorations room.
Don't forget sheet cakes and slices
Sheet cakes follow their own line. Quarter-sheet, half-sheet, and full-sheet cakes each have a matching box, so order those by the sheet size rather than trying to force them into a square box. For cafes selling cake by the slice, a run of single-slice and two-piece boxes at the counter moves far more product than a stack of full-cake boxes ever will.
A last practical note: window boxes sell dessert. If you are doing retail display or grab-and-go, a clear-window kraft box lets the cake do the selling. Plain white boxes are the workhorse for custom orders where the decoration is the surprise.
Related reading and where to buy
Fulji Trading stocks cake boxes, boards, and window boxes by the case, with pickup at our 61 Halifax Street cash-and-carry in Moncton and delivery across New Brunswick, Nova Scotia, PEI and Newfoundland.
- Bakeries and cafes: https://www.fuljitrading.com/industries/restaurants
- Caterers and event pros: https://www.fuljitrading.com/industries/catering
- Moncton pickup and local delivery: https://www.fuljitrading.com/moncton
- Browse the full range: https://www.fuljitrading.com/shop
- Sizing up another package? See our pizza box guide: https://www.fuljitrading.com/blog/resources-guides-1/pizza-box-sizes-explained-a-guide-for-atlantic-canada-pizzerias-8