Kathy, this from the California Walnut Commission:
Approximately 45% of the walnut is meat. Obviously, this depends on the size of the walnuts and the variety, so this is only an approximate figure.
Penny Riggs
California Walnut Commission
1540 River Park Drive, Suite 203
Sacramento, California 95815
Phone: 916-646-3807
So a 5# bag x 45% = 2.25# of walnut meats. Feel free to send on a cookie