Fish Weight Calculation Formulas

Use these simple formulas to calculate the weight of your fish. All of
these will result in reasonable approximations of a fishes weight.
Practice Catch & Release when possible to preserve our fisheries.
 

The rule of thumb for fish weights of various body types are:

Generalized formula for calculating the weight of fish is as follows
(girth X girth X length) divided by 800

BASS - Weight Calculation Formulas
Length² x Girth ÷ 1,200 = weight
(length x length x girth ÷ 1,200) = weight

You can also use
(length X length X length) divided by 1600

BLUEGILL Weight Calculation Formula
(length X length X length) divided by 1200

PIKERAL  Weight Calculation Formula
Length³ ÷ 3,500 = weight
(length x length x length ÷ 3,500) = weight

TROUT & SALMON Weight Calculation Formula
Length x Girth² ÷ 800 = weight
(length x girth x girth ÷ 800) = weight

WALLEYE Weight Calculation Formula
Length³ ÷ 2,700 = weight
(length x length x length ÷ 2,700) = weight
 

CATCH & RELEASE TIPS

1. Play fish quickly. Avoid netting if possible.
2. Handle carefully, avoid stress to eyes, fins, gills, and protective body slime.
3. Remove hooks with pliers. Cut line if gill-hooked or swallowed.
4. Measure fish, photograph and release as quickly as possible.

 

 

Total Length
To determine the accurate length of a fish,
measure a straight line from the tip of the jaw (mouth closed)
to the tip of the compressed tail fin.