Largemouth Bass Length To Weight Conversion Chart

Largemouth Bass Length To Weight Conversion Chart

Several methods are available to estimate the weight of a fish. Some use length as well as girth measurements. Weight also can be estimated using only length measurements based on relationship between length and weight. Length-weight equations can be developed for specific waters, regions (e.g., states), or for a particular species.

Formulas containing length as well as girth are often most accurate for estimating weight, because the fatness or plumpness of the fish is accounted for. If only length is available, the most accurate weights often are estimated from length-weight relationships for specific waters or regions. For instance, in some waters fish might be relatively "skinny," and the weight estimate might be overinflated if based on a formula created from data on a water body where fish are "fat" or even "normal." That's why adding girth to the formula can help with accuracy. Formula's containing girth, however, also may not be as accurate as we'd like, because of inherent differences in the shape of fish and finding the right adjustment factor (or "shape" factor) to use in the formula. And it's important to measure girth carefully, and at the fish's fattest point, as girth estimates affect weight estimates powerfully.

One easy way to estimate fish weight is through the use of standard length-weight formulas. Species-specific formulas, called standard-weight equations, have been developed for dozens of fish species by fishery biologists to describe the standard growth form of a species as a whole. These relationships often are used to assess body condition (the relative weight or plumpness of a fish), which provides an index of a fish's well-being, such as whether there are forage shortages or surpluses, and can sometimes reflect fish growth rate.

These standard length-weight formulas are often developed using thousands of fish from hundreds of populations across the range of a species, so they describe the "general" growth form of that species. For instance, the equation for black crappie was developed using over 20,000 fish across a range of sizes from 175 populations across the geographic range of black crappie.


*An important thing to keep in mind is that these standard length-weight formulas describe fish in "above-average" condition. In fact, the weights in the tables represent the 75th-percentile in the samples for that particular length, and are not average weights. In other words, if you lined up 100 random bass of the same length in order of weight, and those bass were a good representation of the range of weights for that length, the weight provided in the table would be for the 75th heaviest fish. While it might have made more sense to use the median weight for these formulas, fishery biologists decided to go with the 75th percentile so that the standard weight at a given length was an above-average or "ideal" target to shoot for in terms of body condition. So, if your fish appears plump and healthy, the weights from the table should be relatively close. If your fish is skinny to average, it will weigh less, and if very plump and remarkably "fat" it will weigh more. Just make an adjustment. No formula is 100-percent accurate, but if you have only length and not girth, this should help get you in the ballpark. Your state fishery agency may have standard Largemouth Bass Length To Weight Conversion Chart based on regional data posted on their website. These formulas use total length of the fish, measured from the tip of the snout to the tip of the tail fin when compressed.


Largemouth Bass

12 in 0.90 lb
13 in 1.16 lb
14 in 1.47 lb
15 in 1.83 lb
16 in 2.25 lb
17 in 2.73 lb
18 in 3.28 lb
19 in 3.89 lb
20 in 4.59 lb
21 in 5.36 lb
22 in 6.22 lb
23 in 7.17 lb
24 in 8.21 lb
25 in 9.35 lb
26 in 10.60 lb
27 in 11.95 lb
28 in 13.42 lb
29 in 15.01 lb
30 in 16.73 lb
31 in 18.58 lb
32 in 20.56 lb

Get Your Fish On.

Plan your next fishing and boating adventure here.

GET THE NEWSLETTER Join the List and Never Miss a Thing.

Recommended Articles

See More Recommendations

Popular Videos

Spawntime World Class Crappies

Spawntime World Class Crappies

Doug Stange and Brandon Fulgham illustrate spawntime crappie patterns on one of North America's most famous fisheries.

Select Lure Options for Giant Pike

Select Lure Options for Giant Pike

And handful of lure options produce big pike early in the season.

Giant Walleyes According To Calendar Periods

Giant Walleyes According To Calendar Periods

The search for big walleyes begins with an understanding of their nature, keying on prime locations during specific times of the year.

As KVD tells OSG's Lynn Burkhead, innovative Humminbird products and cutting-edge technology like that found in the new Mega 360 Imaging sonar are major reasons contributing to his unparalleled success.

See More Popular Videos

Trending Articles

Pole lines illustrate the paradox of catfishing. At a time when excellent rods, reels, and other Catfish

Catfish Pole Rigs

Richard Peterson with In-Fisherman - April 28, 2016

Pole lines illustrate the paradox of catfishing. At a time when excellent rods, reels, and...

Now more than ever, understanding each category's strong suits is critical to choosing a powerplant that best fits your personal needs and preferences. Boats & Motors

2- Vs. 4-Cycle Outboard Motors

Dan Johnson - April 16, 2018

Now more than ever, understanding each category's strong suits is critical to choosing a...

Everything you need to know about popular catfish species and how to catch them on proven riggings. Catfish

All About Catfish

Rob Neumann

Everything you need to know about popular catfish species and how to catch them on proven...

Several methods are available to estimate the weight of a fish. Some use length as well as girth measurements. Biology

Walleye Length To Weight Conversion Chart

Dr. Rob Neumann - January 03, 2017

Several methods are available to estimate the weight of a fish. Some use length as well as...

See More Trending Articles

More Bass

While Florida is without a doubt “shiner central” for bass, similar tactics can work on other waterways as well. Bass

Fishing Shiners for Big Bass

Steve Quinn - March 17, 2020

While Florida is without a doubt “shiner central” for bass, similar tactics can work on other...

Dr. Todd A. Kuhn discusses why compact soft plastics are great options for bass in this episode of Beyond the Bait Powered by Streamlight.

Why Tube & Creature Baits Are Bass Magnets

Game & Fish Digital Staff - February 18, 2020

Dr. Todd A. Kuhn discusses why compact soft plastics are great options for bass in this...

Dr. Todd A. Kuhn discusses spinnerbaits from top to bottom in this episode of Beyond the Bait Powered by Streamlight.

Master the Spinnerbait to Catch More Bass

Game & Fish Digital Staff

Dr. Todd A. Kuhn discusses spinnerbaits from top to bottom in this episode of Beyond the Bait...

A recent study examined how being either lefty or righty affects feeding mechanics of largemouth bass. Bass

Lefty, Righty Bass

Rob Nuemann

A recent study examined how being either lefty or righty affects feeding mechanics of...

See More Bass

GET THE MAGAZINE Subscribe & Save

Digital Now Included!

SUBSCRIBE NOW

Give a Gift   |   Subscriber Services

PREVIEW THIS MONTH'S ISSUE

GET THE NEWSLETTER Join the List and Never Miss a Thing.