the best way to get an accurate weight on a fish is to weigh it, "paper scales" would have to be adjusted for region, forage, time of year, and type of body of water...

i have caught 20" fish that weighed 3# and i've caught them that weigh over six...just to many varibles to say a 20" fish weighs around XXX

if your catching bullets you'd love these paper scales, on the other hand, if your catching footballs, that are fed up you'd be sorely disapointed

JMHO

BTW, good fish