It's really hard to say. The biggest crappie I've ever caught was 3lb and wasn't but a shade over 15" long. It was river fish and they are short and stocky. She was loaded with eggs and very thick across the back. I've caught a 2.75 and few 2.60s from other lakes and they've been around 16" long. Longest fish I ever caught was probably 16.25" and weighed 2.29, but it was in the winter before she really bulked up too