Northern Pike Weight Formula
The formula to calculate the weight for a Northern Pike that is 40 inches long and has a girth of 22 inches is as follows. Pike have a shape factor of 900.
WEIGHT = LENGTH x GIRTH2 / SHAPE FACTOR
WEIGHT= 40 x (222) / 900
WEIGHT= 40 x 484 / 900
WEIGHT= 19360 / 900
WEIGHT = 21.51 pounds