Exhibit 11 ITT EDUCATIONAL SERVICES, INC. COMPUTATION OF BASIC AND DILUTED EARNINGS PER SHARE (In thousands, except per share data) Three Months Ended June 30, Six Months Ended June 30, --------------------------- ------------------------- 1998 1997 1998 1997 ---- ---- ---- ---- Net income (loss) $ (660) $ 805 $ 6,668 $ 7,007 ======= ======= ======= ======= Shares: Weighted average number of shares of common stock outstanding 27,000 27,000 27,000 27,000 Shares assumed issued (less shares assumed purchased for treasury) on stock options 183 103 163 107 ------- ------- ------- ------- Outstanding shares for diluted earnings per share calculation 27,183 27,103 27,163 27,107 ======= ======= ======= ======= Earnings (loss) per common share: $ (.02) $ 0.03 $ 0.25 $ 0.26