Estimating 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 in which we've done the math for you.
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
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.