Smallmouth Bass Weight Conversion Chart

Smallmouth Bass 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 weight tables 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.


Smallmouth Bass


Length To Weight Conversion Chart

Smallmouth Bass Weight Conversion Chart

 
12 in0.92 pounds
13 in1.18 pounds
14 in1.50 pounds
15 in1.87 pounds
16 in2.30 pounds
17 in2.80 pounds
18 in3.36 pounds
19 in3.99 pounds
20 in4.70 pounds
21 in5.50 pounds
22 in6.38 pounds
23 in7.35 pounds
24 in8.43 pounds
25 in9.60 pounds
26 in10.89 pounds
27 in12.28 pounds

Get Your Fish On.

Plan your next fishing and boating adventure here.

Recommended for You

Across the Walleye Belt, early spring is prime time to tap some of the year's best bites. Walleye

Spring is Prime Time for River Walleyes

Dan Johnson - February 22, 2018

Across the Walleye Belt, early spring is prime time to tap some of the year's best bites.

Spring walleye fishing often means large numbers of fish concentrated in small areas. Walleye

Spring Walleye Fishing Tackle Choices

Steve Ryan - October 19, 2017

Spring walleye fishing often means large numbers of fish concentrated in small areas.

Steve Quinn talks new softbaits for bass from Berkley. Bass

Sensational New Softbaits for Bass

Steve Quinn - April 22, 2019

Steve Quinn talks new softbaits for bass from Berkley.

See More Recommendations

Popular Videos

Electric Filet Knife from Bubba Blades

Electric Filet Knife from Bubba Blades

As OSG's Lynn Burkhead looks on, Josh Neville shows off the cordless and corded versions of a new electric filet knife from Bubba Blades.

Mustad

Mustad's Inkvader Octopus Live Jig

From big fish to small, just about any saltwater game fish out there will love the new Mustad Inkvader Octopus Live Jig that Mustad's Russ Whisler shows to OSG's Lynn Burkhead.

Lowrance Enters Trolling-Motor Market with Ghost

Lowrance Enters Trolling-Motor Market with Ghost

Lowrance's Lucas Steward shows OSG's Lynn Burkhead what all of the fuss is about in the brand new Ghost trolling motor being brought to market by the Tulsa, Okla.-based fishing equipment manufacturer.

See more Popular Videos

Trending Stories

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

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...

Catfish are simple creatures that can be caught using the best catfish rigs. Catching them is simply a matter of putting a good bait in the right in front of them. Catfish

The Best Catfish Rigs

In-Fisherman - January 11, 2018

Catfish are simple creatures that can be caught using the best catfish rigs. Catching them is...

See More Stories

More Bass

Never give up on surface action until winter rips the topwater rod from your cold, blue fingers. Bass

Fall Smallmouths: The Topwater Dossier

Matt Straw - November 11, 2019

Never give up on surface action until winter rips the topwater rod from your cold, blue...

Until the snow flies and beyond, smallmouths are vulnerable to both livebait and artificial lures. Bass

Smallmouths Before the Snow Flies

Steve Ryan - November 14, 2019

Until the snow flies and beyond, smallmouths are vulnerable to both livebait and artificial...

Bass fishermen need a bunch of jigs, and not just to match cover and conditions. Bass

Picking a Bass Jig

Matt Straw - September 25, 2019

Bass fishermen need a bunch of jigs, and not just to match cover and conditions.

See More Bass

GET THE MAGAZINE Subscribe & Save

Temporary Price Reduction

SUBSCRIBE NOW

Give a Gift   |   Subscriber Services

PREVIEW THIS MONTH'S ISSUE

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