Swamp Yankee wrote in message
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I caught a 24" largemouth With a 18" girth through the Ice two weeks ago.
What would it weigh? Where did you find the chart

The 8.64# is based on a formula:

LxLxG÷1200

There are a lot of calculators on the web, just do a search for bass weight
calculator or something like that and you'll find some.