Formula to Approximate Striper Weight The easiest way to approximate weight for the striped bass is length x length x length x 1,950 Another Weight Formula is: (length in inches)x(girth in inches)x(girth in inches)) divided by 800 = Weight in lbs Male stripers are shown in black. Beginning at three years of age, the female is larger than the male at the same age. Males do not live as long as females. In this study, very few males over 8 years old were captured; none were found among large fish over 11 years old. Therefore, virtually all "jumbo" striped bass appear to be females. These results are based on calculated data derived from the examination of annular rings of scales from striped bass caught in various regions of Chesapeake Bay during 1957 and 1958. However, weights from fish caught in recent years are generally lower.