breeding weights and size?

people seem to have a diference of oppinion so lets clear some things what is the good weight for a male ver female for breeding and put weight to size equasions seems some new breeders like my self are having problems with this i mean if its 4 ft long it may be sutabale is what most think but i have found this is not correct so maybe someone could shed some light to this day old question to help some of the newer breeders like my self out is there some kind of equasion i mean my females are big and beautifull but is there some kind of equasion to this other than health? i know this would seem stupid to most of you but to the ones who are questing to do it right it means everything thank you oh ball breeding gods to share this info to us meer pesants lmao :bow::please: