How to Caculate weight for Pike and Trout

Length
Girth
Fish Type
Calculated
Weight

.

Trout
Pike

(1-120 inches)
(1-100 inches)
.
(pounds)

 

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


Lake Trout Weight Formula

The formula to calculate the weight for a Lake Trout that is 24 inches long and has a girth of 16 inches is as follows. Trout have a shape factor of 800.

WEIGHT = LENGTH x GIRTH2 / SHAPE FACTOR

WEIGHT= 24 x (162) / 800
WEIGHT= 24 x 256 / 800
WEIGHT= 6144 / 800
WEIGHT = 7.68 pounds