Check out this fish weight calculator! Just pick your fish species and enter the length and girth in inches.
Fish Weight Calculator
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Published 10/20/2023
Want to know how much your fish weighs but don’t have a scale? No problem. As long as you have a measuring tape or ruler, there are a few great ways to estimate fish weight. Use our fish weight calculator and fish length to weight graphs to get an accurate estimate of your catch’s weight.
*Disclosure: I only recommend products I would use myself and all opinions expressed here are my own. This post may contain affiliate links that at no additional cost to you, I may earn a small commission.
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Fish Weight Calculator
The most accurate fish weight estimate combines a length and a girth measurement of the fish. Adding girth to the equation helps account for fish health and captures whether the fish is fat or skinny for its length.
Length should be measured from the front of the mouth to the tail. Ensure the mouth is closed and pinch the tail. For girth, measure around the fish at the fattest point.
Ok but what if you don’t have a girth measurement? No problem! Then we recommend correlating fish length to statistical data from a state’s department of natural resources
Fish Length to Weight Charts
This next section is length to weight graphs of popular freshwater fish species that you can use to correlate your fish length to an estimated weight.
This data set is provided by the New York State Department of Environmental Conservation from fish caught and measured in New York State. Length to weight conversations are decent estimates but are not entirely accurate because they don’t account for health of the fish and other factors. Just like humans, fish can be on the skinny side or heavier side based on environmental factors. Also, fish tend to grow bigger in larger bodies of water while the same age fish in a smaller body of water will likely be smaller.
We’ve grouped similar sized fish together to make the graphs easier to read.
I chose to use the data source: New York State Department of Environmental Conservation because they had the most complete data set. I also correlated the data to the Wisconsin DNR’s fish weight estimate data and there was a reasonable match.
Panfish Length to Weight Graph
This graph shows length to weight correlations for bluegill, rock bass, black crappie, and yellow perch.
Check out our gear reviews for equipment to help catch huge panfish so you need to use this graph!
Largemouth and Smallmouth Bass Length to Weight Graph
This graph shows length to weight correlations for largemouth bass and smallmouth bass.
Check out our gear reviews for equipment to help catch lunker bass so you need to use this graph!
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Trout Length to Weight Graph
This graph shows length to weight correlations for brook trout, brown trout, and lake trout.
Check out our gear reviews for equipment to help catch trout so you have a need to use this graph!
Walleye Length to Weight Graph
This graph shows length to weight correlations for walleye.
Want to catch huge walleye or large quantities of walleye? Check out our article on the best places in Wisconsin to fish for walleye.
Check out our gear reviews for equipment to help catch trophy walleye so you need to use this graph!
Northern Pike and Musky Length vs Weight Graph
This graph shows length to weight correlations for muskellunge (musky), tiger muskellunge, northern pike, and chain pickerel.
Check out our gear reviews for equipment to help catch trophy pike and musky so you need to use this graph!
Conclusion
Hopefully you found these fish weight estimate methods helpful! Remember, if you don’t have a tape measure on hand, you can mark the length of a fish on a fishing rod, a net handle, or something similar. This lets you minimize handling time on the fish and encourages a safe release while still getting a measurement to memorialize your trophy catch.
Written By: Andrew Juran
Andrew is a seasoned angler with over 25 years of experience fishing across the United States. He has caught hundreds of walleye, pike, bass, trout, and panfish using various techniques and mentored many in the art of fishing. An advocate for sustainable fishing, Andrew is an active member of the Coastal Conservation Association, an organization committed to marine conservation.
For frequent fishing tips, behind-the-scenes looks, and real-time catches, connect with Andrew on Instagram
