EXHIBIT 11 FIRST BELL BANCORP, INC. COMPUTATION OF PRIMARY AND FULLY DILUTED EARNINGS PER SHARE FOR THE THREE AND SIX MONTHS ENDED JUNE 30, 1997 (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS) (UNAUDITED) THREE MONTHS SIX MONTHS ENDED ENDED 6/30/97 6/30/97 ------------ ---------- Net income applicable to common stock $1,914 $3,910 ====== ====== PRIMARY EARNINGS PER SHARE Average number of shares of common stock outstanding 6,517 7,061 Add: Common stock equivalents 132 127 LESS: Weighted average unearned ESOP shares 616 623 ------ ------ Weighted Average Outstanding Shares 6,033 6,565 ====== ====== Primary earnings per share $ 0.32 $ 0.60 ====== ====== FULLY DILUTED EARNINGS PER SHARE Average number of shares of common stock outstanding 6,517 7,061 Add: Common stock equivalents 163 163 LESS: Weighted average unearned ESOP shares 616 623 ------ ------ Weighted Average Outstanding Shares 6,064 6,601 ====== ====== Fully diluted earnings per share $ 0.31 $ 0.59 ====== ======