Fish Weight Calculators

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: