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Bass Length converted to Weight?

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On my first cast last night I had a big blowup on my Spro popper frog. After the battle I hauled in a very nice bass. After a quick picture I went to grab my scale....and it was gone. I did have a tape measure however and the fish hit 22.5 inches.

About an hour later I hauled in yet another big bass. Again I put it to the tape and another 22.5 inches.

Tonight me and my friend loaded some kayaks into the pond and I heard him let out a yell and looked over and he had a stud of a bass out of the water. Again no scale so we taped it and it was 23 inches.

So about what is an approx. weight on these bass. I guessed them to be around 7 lbs. I wouldn't call them fat fish, but they were far from skinny. The last big bass I have the length of in that class was an 18 inch fish that weight 4.9 lbs.

  • Author

Yea I knew the girth is going to change the weight either up or down, but these fish seemed to be the same as any bass I have pulled out of the larger lakes in this area for this time of year.

And to think that yesterday I was getting worried that a big bass may not be pulled out of the pond this year.

  • Super User

Similar to people, fish can be underweight, normal weight or overweight.

Given largemouth bass of typical proportions, the following will normally be within a few ounces:

22.5" = 6.5 lbs

23.0" = 7.0 lbs

Roger

I caught one at KY Lake last weekend that was right at 24" and I would have guessed it at no more than 4 pounds! It was by far the most stretched out bass I think I have ever seen...I would have put it in the live well to get a weight and some pictures but it was caught on a jug so it had to be released immediately...weird fish though!

  • Super User

Need the length and girth to calculate the weight; L X L X G / 1200 = lbs. L = length from tip of closed mouth to center of fork in tail. Girth measured around the widest area, dorsal fin down.

Average LMB girth is 75% of length, however can be up to 100% for extremely heavy body bass.

  • Super User

BR 's weigth calculator is quite accurate, but you need to have the girth also, my last double digit was 23" long X 20.5" girth

BR weight calculator: 10.63 lbs

Scale weight: 10.54 lbs

That 's a 0.09 difference ---> quite accurate.

  • BassResource.com Administrator

Thanks Raul.  I custom designed the calculator to be more accurate than others out there, as it seems they all copied each other's formulas.

http://www.bassresource.com/bassfishing/fishcalculator.html

i caught one 24 inches but it was also 20 inches round it weighed in at 11.3 on the scales they have at the management area

  • Super User
i caught one 24 inches but it was also 20 inches round it weighed in at 11.3 on the scales they have at the management area

BR 's fish weight calculator with those measurements = 11.294 lbs

Take a bass of 'X' length...

Hang it on 'Y' scale....

And get 'Z' weight.

I think this is the most accurate formula :)

Peace,

Fish

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