How to Weigh a Fish by Length & Girth
Many anglers do not carry a fish scale in their boats. Some do not even own one. But that does not mean they cannot determine how much their fish weighs. By measuring the length and girth of the fish, and plugging those numbers into a simple formula, a fisherman can estimate the weight of his catch.
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Instructions
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Measure, in inches, the length of the fish from the front of its mouth to the end of its tail. Write that number down.
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2
Measure, in inches, the girth of the fish at the largest part of the body. Write that number down.
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3
Determine the weight for any fish by first squaring the girth figure. For example, if the girth is 12 inches, multiply 12 by 12. Multiply the new figure by the length of the fish. Divide the new figure by 800 to determine the weight of the fish, in pounds.
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4
Determine bass weight by multiplying the length by the length by the girth. Divide that figure by 1,200.
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5
Determine northern pike weight by multiplying the length times the length times the length. Divide that figure by 3,500.
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6
Determine sunfish weight by multiplying the length times the length times the length. Divide that figure by 1,200.
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7
Determine trout weight by multiplying the length times the girth times the girth. Divide that figure by 800.
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8
Determine walleye weight by multiplying the length times the length times the length. Divide that figure by 2,700.
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References
- Photo Credit Tom Brakefield/Stockbyte/Getty Images
