Whether it is for a wedding, birthday or other celebration the last thing you want is to present the cake, cut it up and then find you don’t have enough cake to go round all of your guests! Use our guide below to calculate how big your basic cake needs to be depending on how many slices you are going to need.

Please bear in mind that portion sizes can be different person to person and the details shown below should be taken as a rough guide only and are based on what we consider to be average cake portions. If you want a novelty shaped cake then we can discuss with you the number of portions we would expect to get from the cake at the time we discuss the design with you.

Portion guide for fruit cakes

Size	Round cake portions	Square cake portions
13 cm (5in)	16	25
15cm (6in)	25	36
18cm (7in)	36	49
20cm (8in)	49	64
23cm (9in)	64	84
25cm (10in)	84	100
28cm (11in)	100	121
30cm (12in)	120	144
36cm (14in)	144	196
41cm (16in)	196	256

Portion guide for sponge cakes

Size	Round cake portions	Square cake portions
13 cm (5in)	8	12
15cm (6in)	12	18
18cm (7in)	18	24
20cm (8in)	24	32
23cm (9in)	32	42
25cm (10in)	42	50
28cm (11in)	50	61
30cm (12in)	61	72
36cm (14in)	72	98
41cm (16in)	98	128