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Home >> Fishing >> Fish Weight Calculator << Back

Fish Weight Calculators

Have you ever wondered how much your "catch-n-release" trophy weighed? How many times have you wished you could find or had taken your scales to weigh a nice catch? Why not try this? Carry a measuring tape - a cloth one that can be bought in any sewing/craft department. Take the measurements as described below, and use the following Fish Weight Calculator for fish in general, trout, bass, pike and walleye.

If you really goof up and forget or misplace the measuring tape, just use a couple pieces of line to take your mesurements and get the actual numbers when you get home. Be sure to somehow mark one so you'll know which is length and which is girth.

Remember that no length/weight formula can ever replace an accurate scale. However, the following calculators should enable to you to get a fair estimate that's within about 10 percent of the actual weight.

Note: Be sure no matter what species of fish and measure from the lower jaw to the fork of the tail and measure the girth at the widest part around the body. Make sure that at no time should your tape measure or other measuring device go under the gill plate or into the gills!

General Fish Weight Calculator
Length x Girth² ÷ 800
(length x girth x girth ÷ 800)
1. Enter the length in INCHES:
2. Enter the girth in INCHES:
3. Press to calculate the weight:
4. The fish weight in POUNDS:
5. The fish weight in KILOGRAMMES: 

Trout Calculator
Length x Girth² ÷ 800
(length x girth x girth ÷ 800)
1. Enter the length in INCHES:
2. Enter the girth in INCHES:
3. Press to calculate the weight:
4. The fish weight in POUNDS:


Bass Calculator
Length² x Girth ÷ 1,200
(length x length x girth ÷ 1,200)
1. Enter the length in INCHES:
2. Enter the girth in INCHES:
3. Press to calculate the weight:
4. The fish weight in POUNDS:


Pike Calculator
Length³ ÷ 3,500
(length x length x length ÷ 3,500)
1. Enter the length in INCHES:
2. Press to calculate the weight:
3. The fish weight in POUNDS:


Walleye Calculator
Length³ ÷ 2,700
(length x length x length ÷ 2,700)
1. Enter the length in INCHES:
2. Press to calculate the weight:
3. The fish weight in POUNDS:

Email us a picture of your trophy fish! You never know it just might show up here!

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