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Fish Weight Calculation

This method of weight calculation is not accurate enough for record applications, but is close enough for most purposes. It works best on cylindrical shaped fish.

W = (L x G2) / K 

W = weight in pounds
L = length in inches
G = girth in inches (squared)
K = 800 for fish with “normal shapes (bass, trout, etc.); 900 for long, cylindrical fish (pike, gar, barracuda, etc.)

Example: If you catch a rainbow trout that is 14 inches long and has a girth of 16 inches, you would estimate its weight by multiplying its length times the square of its girth, then dividing by 800: 


Congratulations! You’ve just caught a fat 4 1/2 pound trout. 1. 14 x 16 x 16 = 3584 2. 3584 / 800 = 4.48


 Information borrowed from Soucie’s Field Guide of Fishing Facts