Recently had a co-worker ask me about estimating weight based on length and girth. I found the following on TPWD webpage. Just thought I would share.

"Estimating Weight of Fish Caught
How can you estimate the weight of a fish that was caught and released?

You will need to have the length and girth of the fish to calculate an estimate. This formula works for all fish, although the example is for largemouth bass. To get weight in pounds, square the girth in inches (girth multiplied by itself) then multiply this times the length in inches. Divide this product by 800.

For example, we can use one of the recent ShareLunker bass. The girth was 20.25 inches and the length was 26 inches. First, take 20.25 x 20.25 to get 410.06. Multiply this times 26 to get 10,661.6. Divide this by 800 to get 13.33 pounds. The actual weight of this particular bass was 13.05 pounds, so that is a reasonable estimation."

go spend the $20 and get a scale much easier

Yes, the scale is easier but, its nice to know there is another way if you don't happen to have it with you.

Not real accurate these formula's.

I have a lenght to weight conversion chart that got off the Honey Hole Magazine web site and it is real close. I was fishing a stock tank measuring fish then weighing them and found out it was very close to my scales. I could e-mail it to you if you want.