What is the formula for determining the weight of a fish based on its size? The
rule of thumb for fish weights of various body types are:
Generalized formula for calculating the weight of fish is as follows:
(girth X girth X length) divided by 800
BASS - Weight Calculation Formulas
Length² x Girth ÷ 1,200 = weight
(length x length x girth ÷ 1,200) = weight
You can also use:
(length X length X length) divided by 1600
BLUEGILL - Weight Calculation Formula
(length X length X length) divided by 1200
PIKE - Weight Calculation Formula
Length³ ÷ 3,500 = weight
(length x length x length ÷ 3,500) = weight
TROUT and SALMON- Weight Calculation Formula
Length x Girth² ÷ 800 = weight
(length x girth x girth ÷ 800) = weight
WALLEYE - Weight Calculation Formula
Length³ ÷ 2,700 = weight
(length x length x length ÷ 2,700) = weight
General Guide to Fish Weight and Length
Species Weight Length
Largemouth Bass 8 lbs. 22"
Smallmouth Bass 5 lbs. 20"
Crappie 2 lbs. 15"
Rock Bass 1 lb. 12"
Sunfish 1 lb. 11"
White Bass 2 lbs. 8 oz. 18"
Striped Bass 20 lbs. 37"
White Perch 1 lb. 4 oz. 13"
Channel Catfish 12 lbs. 30"
Blue Catfish 30 lbs. 38"
Flathead Catfish 25 lbs. 40"
Rainbow Trout 4 lbs. 22"
Brook Trout 2 lbs. 16"
Brown Trout 5 lbs. 25"
Chain Pickerel 4 lbs. 24"
Muskellunge 15 lbs. 40"
Northern Pike 6 lbs. 30"
Walleye 5 lbs. 25"
Yellow Perch 1 lb. 4 oz. 12"
Gar 10 lbs. 40"
Bowfin 10 lbs. 30"
Carp 20 lbs. 34"
Sauger 2 lbs. 18"
CATCH & RELEASE TIPS
1. Play fish quickly. Avoid netting if possible.
2. Handle carefully, avoid stress to eyes, fins, gills, and protective body slime.
3. Remove hooks with pliers. Cut line if gill-hooked or swallowed.
4. Measure fish, photograph and release as quickly as possible.
5. Use the fish measurements and formulas here to find out the fishes weight.
rule of thumb for fish weights of various body types are:
Generalized formula for calculating the weight of fish is as follows:
(girth X girth X length) divided by 800
BASS - Weight Calculation Formulas
Length² x Girth ÷ 1,200 = weight
(length x length x girth ÷ 1,200) = weight
You can also use:
(length X length X length) divided by 1600
BLUEGILL - Weight Calculation Formula
(length X length X length) divided by 1200
PIKE - Weight Calculation Formula
Length³ ÷ 3,500 = weight
(length x length x length ÷ 3,500) = weight
TROUT and SALMON- Weight Calculation Formula
Length x Girth² ÷ 800 = weight
(length x girth x girth ÷ 800) = weight
WALLEYE - Weight Calculation Formula
Length³ ÷ 2,700 = weight
(length x length x length ÷ 2,700) = weight
General Guide to Fish Weight and Length
Species Weight Length
Largemouth Bass 8 lbs. 22"
Smallmouth Bass 5 lbs. 20"
Crappie 2 lbs. 15"
Rock Bass 1 lb. 12"
Sunfish 1 lb. 11"
White Bass 2 lbs. 8 oz. 18"
Striped Bass 20 lbs. 37"
White Perch 1 lb. 4 oz. 13"
Channel Catfish 12 lbs. 30"
Blue Catfish 30 lbs. 38"
Flathead Catfish 25 lbs. 40"
Rainbow Trout 4 lbs. 22"
Brook Trout 2 lbs. 16"
Brown Trout 5 lbs. 25"
Chain Pickerel 4 lbs. 24"
Muskellunge 15 lbs. 40"
Northern Pike 6 lbs. 30"
Walleye 5 lbs. 25"
Yellow Perch 1 lb. 4 oz. 12"
Gar 10 lbs. 40"
Bowfin 10 lbs. 30"
Carp 20 lbs. 34"
Sauger 2 lbs. 18"
CATCH & RELEASE TIPS
1. Play fish quickly. Avoid netting if possible.
2. Handle carefully, avoid stress to eyes, fins, gills, and protective body slime.
3. Remove hooks with pliers. Cut line if gill-hooked or swallowed.
4. Measure fish, photograph and release as quickly as possible.
5. Use the fish measurements and formulas here to find out the fishes weight.
Fish Weight Calculators
| Use these simple formulas to calculate the weight of your fish. All of these will result in reasonable approximations of a fishes weight. Practice Catch & Release when possible to preserve our fisheries. |
| Fish Weight Calculation Formulas |
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