Steelhead / Rainbow Trout Weight Calculation Equation
The formula to calculate the weight for a trout that is 20 inches long and has a girth of 12 inches is as follows. Trout have a shape factor of 740.
WEIGHT = LENGTH x GIRTH2 / SHAPE FACTOR
WEIGHT= 20 x (122) / 740
WEIGHT= 20 x 144 / 740
WEIGHT= 2880 / 740
WEIGHT = 3.89 pounds
