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Length
Girth
Fish Type
Calculated
Weight

.

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

Trout Weight

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 800 and a girth ratio of (.6).

WEIGHT = LENGTH x GIRTH2 / SHAPE FACTOR

  • WEIGHT= 20 x (122) / 800
  • WEIGHT= 20 x 144 / 800
  • WEIGHT= 2880 / 800
  • WEIGHT = 3.6 pounds