1 HAMILTON BANCORP, INC. AND SUBSIDIARY CALCULATION OF EARNINGS PER SHARE (Dollars in thousands, except per share data) EXHIBIT 11 Three Months Ended Nine Months Ended September 30, September 30, ---------------------------- ------------------------ 1998 1997 1998 1997 ---------- --------- --------- --------- Basic Weighted average number of common shares outstanding 10,046,377 9,827,949 9,960,679 8,462,114 Net income $5,685 $4,630 $16,144 $11,193 Basic earnings $0.57 $0.47 $1.62 $1.32 Diluted: Weighted average number of common shares outstanding 10,046,377 9,827,949 9,960,679 8,462,114 Common equivalent shares outstanding - options 431,260 371,156 375,520 371,156 Total common and common equivalent shares outstanding 10,477,637 10,199,105 10,336,199 8,833,270 Net income $5,685 $4,630 $16,144 $11,193 Diluted earnings per share $0.54 $0.45 $1.56 $1.27 28