In case anyone is interested I worked it out! LOL
Assumption based on 80g per cat per day (2 meals).......
560g per cat per week
2427g per cat per month
29120g per cat per year
So for 7 months worth of food (from age 4-12 months) = 16989g
As I am getting 3 kittens I will need = 50967g or 5.09 bags of 10kg food
