How much should my ball pythons weigh?

I have two young ball pythons : a male Spider and a female Pastel. The female is 9 months old and the male is 8 months old. The male is 21 inches long, the female is 23 inches long. I've had them for 6 months and have been feeding them each one frozen/thawed mouse hopper per week. The female is much thicker than the male, and I'm concerned about how much they should weigh, but I cannot find the weight for 21 - 23 inch ball pythons. I am going to purchase a scale shortly, but in the mean time please help me so I'll know how on/off target they are. I hope to breed them in the winter of 2013 at the earliest, when the female is of the proper age and size. Also note - the male is very active and spends several hours a day patrolling and trying to escape the tank recently. I would prefer the answer to be measured in grams. Thank you!