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Know the regulations to make your fishing more enjoyable.
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Fisheries Management

Fishing WisconsinEstimating fish weight

Fish are sometimes damaged when weighed. Using the appropriate formula for your species below, you can quickly calculate the "approximate" weight of your fish by using a ruler. You may also wish to download our trophy converter [PDF 68KB] in which we've done the math for you.

Diagram showing how to measure length and girth of a fish to calculate approximate weight.

Please note when using the formulas:

  • length and 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

To measure your fish:

A = length and B = girth

Formulas

bass weight = (length x length x girth) / 1,200

pike weight = (length x length x length) / 3,500

sunfish weight = (length x length x length) / 1,200

trout weight = (length x girth x girth) / 800

walleye weight = (length x length x length) / 2,700

For example, you catch a 16 inch walleye. Using the formula for walleye above: (16 x 16 x 16) / 2,700 = 1.5 pounds. Your walleye would weigh approximately 1.5 pounds.

Last revised: Tuesday April 07 2015