Fish Weight Estimator: Largemouth Bass

Fish Weight Estimator: Largemouth Bass

Several methods are available for estimating the weight of a fish based on length and girth measurements. Without girth measurements, however, weight can be estimated using only length from length-weight relationships. These formulas can be developed for a fish species in a water body, state, or region, or for a species in general.

Species-specific length-weight formulas, called standard-weight equations, are used by fishery biologists to estimate body condition, or the relative weight or plumpness of a fish, compared to a standard weight for a fish of that length. These formulas are often created using thousands of fish from hundreds of populations across the range of the species, so they describe a general growth form of that species.

Following are standard weights based on the formula for largemouth bass. The weights given are for fish in "above average" body condition. Fish weights are often variable for a given length, so you can make a judgment about how fat your fish is and make an adjustment.

Length (inches)Weight (pounds)Length (inches)Weight (pounds)

12.0


0.88


21.5


5.94

12.5

1.01


22.0

6.41

13.0


1.15

22.5

6.90

13.5

1.30

23.0

7.41

14.0

1.46

23.5

7.95

14.5

1.64

24.0

8.52

15.0

1.83

24.5

9.11

15.5

2.04

25.0

Get Your Fish On.

Plan your next fishing and boating adventure here.

Recommended for You

Catfish is meaty, juicy and holds up well in this soul-satisfying fried fish recipe with homemade chips and tartar sauce. Fish Recipes

Catfish Dinner with Homemade Chips and Tartar Sauce Recipe

Jenny Nguyen-Wheatley

Catfish is meaty, juicy and holds up well in this soul-satisfying fried fish recipe with...

Balance is the goal when tipping jigs with trailers. Bass

Rigging Soft Bass Baits Correctly

Matt Straw - May 15, 2018

Balance is the goal when tipping jigs with trailers.

The range of walleye hardbaits encompasses multiple categories and a dizzying number of lures. Walleye

The Lowdown on Walleye Hardbaits

Steve Ryan - May 28, 2019

The range of walleye hardbaits encompasses multiple categories and a dizzying number of lures.

See More Recommendations

Popular Videos

Minn Kota's Brad Henry shows OSG's Lynn Burkhead that there's much to like in the new Minn Kota Riptide Terrova saltwater trolling motor that comes with I-Pilot and an 87-inch shaft.

Largemouth Bass: Tricks of Our Trade

Largemouth Bass: Tricks of Our Trade

The In-Fisherman staff reveals insider swimming jig tips and tricks for big bass.

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.

See more Popular Videos

Trending Stories

'Walleyes spawn in spring and understanding spring walleye migrations, whether you live north or south, will help you pinpoint their predictable locations year after year. 

Walleyes spawn in spring, but spring may arrive in February in Mississippi, March in Walleye

Understanding Spring Walleye Migrations

Gord Pyzer - June 02, 2018

'Walleyes spawn in spring and understanding spring walleye migrations, whether you live north...

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...

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...

See More Stories

More Bass

What makes intercepting a trophy smallmouth more likely? The answers might be surprising. Bass

Catching Trophy Smallmouth Bass

Matt Straw - July 01, 2019

What makes intercepting a trophy smallmouth more likely? The answers might be surprising.

The bass' large mouth is ideal for feeding on preyfish and other aquatic creatures that live throughout the water column. Bass

The Critter Connection to Largemouth Bass

Steve Quinn - August 28, 2019

The bass' large mouth is ideal for feeding on preyfish and other aquatic creatures that live...

Bass pros share some of their favorite techniques that led to financial gains. Bass

Tournament Money Makers for More Bass

Sean Ostruszka

Bass pros share some of their favorite techniques that led to financial gains.

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.