EXHIBIT 11 Washington Trust Bancorp, Inc. Computation of Per Share Earnings For the Periods Ended March 31, 2004 and 2003 Three months ended March 31, 2004 2003 - -------------------------------------------------------------------------------------------------------------------------- (In thousands, except per share amounts) Basic Diluted Basic Diluted ----------------- ----------------- ---------------- ------------------ Net income $4,955 $4,955 $4,750 $4,750 Share amounts: Average outstanding 13,202.6 13,202.6 13,059.3 13,059.3 Common stock equivalents - 310.7 - 170.9 - ------------------------------------------------ ----------------- ----------------- ---------------- ------------------ Weighted average outstanding 13,202.6 13,513.3 13,059.3 13,230.2 - ------------------------------------------------ ----------------- ----------------- ---------------- ------------------ Earnings per share $.38 $.37 $.36 $.36 - ------------------------------------------------ ----------------- ----------------- ---------------- ------------------