Ball food weights

I have never weighed my snakes food before feeding them but am thinking about doing it to keep track of what I need.

Can anyone give me a good guide for what weight food for what size Ball(Rats and Mice)?

I don't pay too much attention to the weight of the feeder. I usually try feeding 10% of the snake's weight while the snake is growing. I feed small rats (40-80g) to just about all my ball pythons, even my 2000g girl. I might bump her up to mediums soon, but so far she's growing well on smalls.

weighing prey items is overkill feed them appropriatish to the widest part of their body