I don't have a set system on when I weigh my snakes. With my babies, I try to weigh them about once a month, and sometimes I go through and weigh all of them.
You will want to wait a few days after feeding, to allow them to digest the food before weighing them.
I use iHerp for tracking. Here's a thread I started on it:
http://www.cornsnakes.com/forums/sho...d.php?t=116975
You can track pretty much everything with it, including breeding projects.
You can use the
Munson Plan as a guide on what size prey to feed, based on the weight of the snake.
Weight Freq prey size prey wght
4-15gr 5-6 days pinks 2-3gr
16-23gr 5-6 days dbl pinks 3gr X2
24-30gr 6-7 days sm fuzzy 5-7gr
30-50gr 6-7 days fuzzy 7-9gr
51-90gr 6-7 days hopper 9-12gr
91-170gr 6-7 days weanling 14-20gr
170-400gr *7 days adult 20-30gr
401+gr *7 days xl adult 30-50gr