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Here is a tool to calculate it's weight.
Calculates weights for fish with a standard body shape like bass, trout,
Sturgeon.
Standard Fish Weight Calculator
Here are some other formulas that I found on the
web. Your guess is as good as mine as to which is the best formula for
your purpose. I think that in most cases it would be prudent to use the
formula that returns the highest number. Don't you?
Please note when using the formulas:
length & girth are measured in inches,
Girth is the distance around the body of the fish at its largest point, and
all answers are in pounds.
The Formula:
Bass weight = (length x length x girth) / 1,200 (This
is the formula used in the calculator)
Pike weight = (length x length x length) / 3,500
Sunfish weight = (length x length x length) / 1,200
Trout/Salmon weight = (length x girth x girth) / 800
Walleye weight = (length x length x length) / 2,7000
For example, you catch a 16 inch walleye. Two variables are known. 1] You are
not fishing in the S.F.Bay Area and 2] you have a Walleye. Using the formula for
Walleye above: (16 x 16 x 16) / 2,7000 = 1.5 pounds. Your walleye weighs approximately 1.5 pounds.
-OR-
The Formula:
Weight (lbs) = (Length x (Girth x Girth)) / 750 Length and girth in inches
-OR-
The Formula:
((Girth x Girth) x Length) / 800 = weight in pounds
(girth and length are inches)
Example:
If the fish’s girth is 15 inches and its length is 29 inches, the formula would be used as follows:
15 x 15 x 29, divided by 800 = 8.16 pounds
Then the ".16" or "16/100" is converted to ounces (multiply by 16)
.16 x 16 = 2.56 or 3 ounces
so this fish is 8 pounds 3 ounces
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