What Size Cake Box Do I Need? A UK Cake Box Size Guide
By the Samz Packaging team, Bradford, UK · Updated November 2026
Pick the board first. Choose a cake board 1 to 2 inches wider than your cake, then a cake box with the same width as the board and at least 1 inch of space above the cake. For example, an 8 inch cake sits on a 10 inch board inside a 10 x 10 inch box.
How to choose a cake box size in 4 steps
Most bakers in the UK size their boxes in inches, and the simplest way to get it right is to work from the cake outwards. These four steps answer the question what size cake box do I need for almost any bake.
- Measure the cake. Note the width of the finished cake, including any buttercream or fondant, and its height from the base to the highest decoration.
- Pick the board. Choose a cake board 1 to 2 inches wider than the cake. An 8 inch cake goes on a 10 inch board, which leaves a neat border for lifting and handling.
- Match the box to the board. The box should be the same size as the board, so the board sits snugly and cannot slide about. A 10 inch board belongs in a 10 x 10 inch box.
- Check the height. Add the cake height and about 1 inch of headroom. If that is taller than the box, move up to a tall cake box.
If you are between two sizes, choose the larger one and put a non-slip mat under the board. A small gap is easy to manage, but a cake squeezed against the walls of a box is not.
UK cake box size chart
Use this chart as a starting point. It shows common cake sizes, the board that suits them and the standard white cake boxes with lids we stock.
| Cake size | Board | Box size |
|---|---|---|
| 6 inch cake | 8 inch board | 8 x 8 x 5 inch box |
| 8 inch cake | 10 inch board | 10 x 10 x 6 inch box |
| 10 inch cake | 12 inch board | 12 x 12 x 6 inch box |
| 12 inch cake | 14 inch board | 14 x 14 x 6 inch box |
All four standard boxes are listed in the plain cake boxes range. For heights beyond 6 inches, see the tall boxes below.
How tall should a cake box be?
Height is where most boxing mistakes happen. A box that is wide enough but too shallow will crush piping, flowers or a topper against the lid. A good rule is to take the height of the cake, add about 1 inch of headroom, and add the thickness of the board.
A single layer sponge or a modest two layer cake usually sits comfortably in a 5 or 6 inch box. Layered, stacked, drip or heavily decorated cakes need more room, which is why tall boxes exist.
| Box | Good for |
|---|---|
| 8 x 8 x 8 inch tall box | Small tall cakes, mini tiers, cakes with a topper |
| 10 x 10 x 10 inch tall box | Tall celebration cakes and two tier bakes |
| 12 x 12 x 12 inch tall box | Big tiered cakes and cakes with height decorations |
Heavy, tiered and wedding cakes
Heavy cakes need more than a thin board. For fruit cakes, stacked tiers and wedding cakes, use a cake drum, which is a thick, rigid base that will not bend when you lift it. Our drums are 12 mm thick and come in round and square shapes. If you are not sure whether you need a drum or a board, read our guide to cake drum vs cake board.
Remember that a drum is thicker than a normal board, so allow for that in your headroom. A drum also needs a box wide enough for its full diameter.
Cupcakes, slices and small bakes
Not every order is a whole cake. For individual portions, choose a box made for the job rather than a cake box with the lid cut down.
- Cupcakes and muffins: our cupcake boxes with clear windows come in single, 2, 4, 6 and 12 hole sizes, so every cupcake is held upright and customers can see what they are buying.
- Single slices: individual cake slice boxes hold one wedge of cake, cheesecake or tart for takeaway and gifting. Browse the full cake slice boxes range.
Common cake box mistakes to avoid
- Choosing the box by cake size only. Always size the box to the board, not the cake.
- Using a board bigger than the box. The board must fit inside without bending the edges.
- No headroom. Leave at least 1 inch above the highest decoration.
- Skipping the non-slip mat. Even a snug board can creep on a bumpy journey.
- Stacking boxes on a soft cake. Keep the box flat and never pile anything on top.
Tips for carrying cakes safely
Chill the cake first so buttercream is firm, then place it in the box on a non-slip mat. Carry the box with both hands underneath, keep it level, and put it on a flat surface in the car footwell or boot, never on a seat. Close the lid fully before you set off, and drive smoothly. If you deliver regularly, keep a few spare boxes in different sizes so there is always one that fits.
Cake box size FAQs
What size cake box do I need for an 8 inch cake?
An 8 inch cake normally sits on a 10 inch board, so you need a 10 x 10 inch cake box. Check the height too: a 10 x 10 x 6 inch box suits most single and double layer cakes, and a taller box suits cakes with toppers.
Should the cake box be bigger than the cake board?
No. The box should be the same size as the board so the board fits snugly. If the box is much bigger, the board can slide and the cake can tip.
How much space should be above the cake in the box?
Leave at least 1 inch between the top of the cake, including decorations, and the lid. Add a little more for piped flowers, toppers or drip decorations.
What box do I need for a tiered or very tall cake?
Use a tall cake box, which is 8, 10 or 12 inches high in our range, and stack tiers on a cake board or cake drum. Very large wedding cakes are often boxed tier by tier and assembled at the venue.
Do I need a cake board as well as a cake box?
Yes. A board lets you lift the cake, keeps the base flat and stops icing touching the box. Choose a board 1 to 2 inches wider than the cake.
More UK packaging guides
Ready to box your cakes?
Shop standard and tall cake boxes, cake boards and drums from Bradford. Order before 2 PM for same-day dispatch, with free UK delivery over £50.
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