l was fishing with my friends today in a pond and caught a 40 inch flathead catfish.Can anyone estimate how much it weighed?Thankyou.

l will gues 30 to 40 lbs

l can not find a formula for catfish, maybe because their girth can alter the numbers to much. But l hear that most formula is r pretty far off.

Here is a thread that discusses it
http://catfish1.com/forums/archive/index.php/t-43291.html

Here is another calculator, with a General Guide to Fish Weight & Length
http://bobberstop.com/weightcaculator.html

Flathead Catfish 25 lbs. 40''

Here is one that estimates the size based on several things, that says it was 17-19lbs
http://csgnetwork.com/fishfreshwtcalc.html