EXHIBIT 11 Washington Trust Bancorp, Inc. Computation of Per Share Earnings For the Periods Ended March 31, 2000 and 1999 Three months ended March 31, 2000 1999 - ------------------------------------------ ----------------------------------- ----------------------------- (In thousands, except per share amounts) Basic Diluted Basic Diluted ----------------- ----------------- ---------------- ------------ Net income $2,923 $2,923 $2,744 $2,744 Share amounts: Average outstanding 10,925.4 10,925.4 10,801.1 10,801.1 Common stock equivalents - 158.3 - 274.9 - -------------------------------------- ----------------- ---------------- ----------------- ---------------- Weighted average outstanding 10,925.4 11,083.7 10,801.1 11,076.0 - -------------------------------------- ----------------- ---------------- ----------------- ---------------- Earnings per share $.27 $.26 $.25 $.25 - -------------------------------------- ----------------- ---------------- ----------------- ----------------