How to Choose Cake Boxes: 6-Inch and 8-Inch Cakes in Centimeters, Sizing Cake Boxes, and Paper, Greaseproof and Bread Bags

Quick Answer

Cakes are usually sized in inches; 1 inch ≈ 2.54 cm, so a 6-inch cake is about 15 cm and an 8-inch about 20 cm. A cake box should be slightly wider than the cake with height left for decoration; use the supplier’s spec sheet. Bakeries pair boxes with kraft paper bags for takeaway, greaseproof bags for oily pastries, and dedicated bread and toast bags to keep texture.

Cake inches to centimeters

Cake size	Diameter (about, cm)
4 inch	10.2
6 inch	15.2
8 inch	20.3
10 inch	25.4

Converted at 1 inch = 2.54 cm. Servings vary widely by cutting style; Taiwanese brands often label a 6-inch cake as serving 4–6.

Sizing a cake box

Width: slightly larger than the cake for handling and decoration.
Height: depends on layers and top decoration; piped cream needs more room.
Base board: a matching cake board makes lifting easier.
Window and printing: clear windows show the cake; printing builds your brand.

Choosing bakery bags

Type	Use
Kraft paper bag with handles	Takeaway, gift boxes, brand image
Greaseproof paper bag	Puff pastry, fried and oily snacks
Bread bag	Single buns, optional window
Toast bag	Whole loaves, often OPP or PP
Cookie bag	Small cookie packs and gift portions