The fish in my profile picture weighed in at 30 lbs on my rapala digital scale. The scale has not been super consitent. I came to believe that it was 30lbs and never questioned it. That scale is now gone and I haven't bought the new one form Coffey mareting yet, so for the last carp I caught I used a length and girth calculator to get the weight. A 28in carp with 16 in girth weighed 12lbs, just out of curiosity I tryped in the only measurements I had on the flathead. It was 42inches long. The auto girth it produced was around 24 inches and estimated it at 42lbs. I know mine was not that big. But it had a bigger girth than the 16inch gith of the smaller carp. Question is, what weight calculator is best, and what is the formula, since they are usually more accurate than the weight generators. I don't know what the average weight for a 42in flat is, it was my first flat ever, caught last march. Sorry for rambling, any info would be appreciated.