Bowling ball weights range from 6 lbs. To 16 lbs. in most cases males will use weights ranging between 12 lbs. and 16 lbs. While females would use ranges from 10 lbs. to 14 lbs. For children a good rule of thumb is 1 lbs. per their age. So for an eight year old, 8 lbs. would work.
Bowling ball weight is probably the most common concern when choosing a bowling ball. One thing to think carefully about before choosing the weight is that if you’ve never thrown a ball drilled specifically for your hand you might assume you need a lighter ball than you do because most house balls have large finger holes and very short spans. A ball drilled to your specifications will feel about two pounds lighter than your average house ball.