OUTER SIZE USABLE SIZE. #4 9.5×14.5 9.5×13.5. #3 8.5×14.5 8.5×13.5. #2 8.5×12″ 8.5×11″. #1 7.25×12″ 7.25×11″. #0 6×10″ 6×9″. #00 5×10″ 5×9″.