EXHIBIT 11 FIRST BELL BANCORP, INC. COMPUTATION OF PRIMARY AND FULLY DILUTED EARNINGS PER SHARE FOR THE THREE MONTHS ENDED MARCH 31, 2001 (in thousands, except per share amounts) (unaudited) Three Months Ended March 31, 2001 Weighted Average Per Income Shares Share ------ --------- ----- Income available to common stockholders $1,675 4,759 -- Unearned ESOP shares -- (493) -- Unearned MRP shares -- (211) -- ------ ----- ----- Basic earnings per share 1,675 4,055 $0.41 Effect of dilutive securities: MRP shares -- 30 -- Stock options -- 101 -- ------ ----- ----- Diluted earnings per share $1,675 4,186 $0.40 ====== ===== =====