The following is an approximate size guide for a whole turkey:

4 – 6 people 4.0 kg
6– 8 people 5.0 kg
8-10 people 6.0 kg
10-12 people 7.0 kg
12-14 people 8.0 kg
14-16 people 9.0 kg
16-18 people 10.0 kg
18-20 people 11.0 kg
20-22 people 12.0 kg