How to Choose Cake Board Sizes (And Not Get It Wrong)
The right cake board size, thickness and material — explained for bakeries. Includes a size chart in inches and cm, drum vs. thin board, and wholesale buying tips.
A cake board is a small cost with big consequences. Too small and your border gets squeezed; too thin and a 3-tier order ends up on the floor. Here is the short version bakers actually need — plus a size chart you can keep.
The 2-inch rule
For a single cake, choose a board 2 inches (5 cm) larger than the cake — one inch of space on each side for frosting, piping, and a clean border. An 8-inch cake goes on a 10-inch board. Simple.
For tiered cakes, the logic splits in two:
- Each tier sits on a board the same size as the tier (a 6-inch tier on a 6-inch board) — this is what keeps the structure stable inside.
- The bottom tier sits on a cake drum 2 inches larger than itself — the drum is the foundation of the whole cake, and the extra 2 inches gives your bottom border room to breathe.
Quick size chart
Single cakes follow the 2-inch rule; the tiered base uses a drum 2 inches larger than the bottom tier:
- 6-inch cake — 8-inch board · 8-inch drum · 20 cm
- 8-inch cake — 10-inch board · 10-inch drum · 25 cm
- 10-inch cake — 12-inch board · 12-inch drum · 30 cm
- 12-inch cake — 14-inch board · 14-inch drum · 35 cm
- 14-inch cake — 16-inch board · 16-inch drum · 40 cm
Thickness: thin board vs. cake drum
This is where most ordering mistakes happen.
- Thin boards (approx. 2 mm) — for light single-layer cakes, cookies, pastries, and use inside a tiered cake under each tier. Cheap, fine for light duty.
- Cake drums (4 mm and up) — for anything heavy: fruit cakes, multi-tier wedding cakes, dense chocolate cakes, anything traveling. The doubled thickness means it will not flex or bow on the drive.
Rule of thumb: if the cake is going in a box and into a car, use a drum.
Material: why greaseproof matters
A pretty board that shows grease spots by afternoon is not a bargain. Look for greaseproof boards — typically laminated or foil-finished (gold, silver, or printed) — so buttercream and chocolate marks stay on the cake, not the board. Plain unlaminated cardboard absorbs oil within hours; fine for display-only, risky for boxed orders.
Buying boards for a bakery: 4 tips
- Standard sizes cost less. 6/8/10/12/14-inch are made in volume; custom diameters mean custom tooling. Unless branding demands it, standard wins.
- Buy by the case, mixed sizes. Board weight is low, so freight per piece is small — consolidating sizes into one order beats drip-ordering.
- Match the board to your boxes. Your 10-inch board must fit your 10-inch box with the cake on it. Check internal box dimensions, not the label size.
- Custom printing starts small these days. If you want your logo on every board, digital printing keeps MOQs low — you do not need 10,000 pieces to get branded boards anymore.
FAQ
What size board for a half-sheet cake?
A half-sheet (approx. 12 x 16 inches) needs a board at least 14 x 18 inches — cut-to-size boards are available, or round up to a full-sheet board.
Can I put a cake straight on a glitter or mirror board?
Decorative finishes are for display. Keep a greaseproof drum or foil between cake and decorative surface — standard practice for food safety and cleaning.
Board too big for the box — can I trim it?
You can, but a cut edge loses the foil wrap and exposes cardboard. Better to sell it as a cake and board set with the right box from the start.
Need boards, drums, and boxes that actually match?
Sweetpack is a bakery packaging manufacturer — standard sizes in stock, custom print from low MOQs. Email linda168@sweetpack.top for the catalog and a quote within 24 hours.
