Exhibit 11 ITT EDUCATIONAL SERVICES, INC. COMPUTATION OF PRIMARY AND FULLY DILUTED EARNINGS PER SHARE (In thousands, except per share data) Three Months Ended September 30, Nine Months Ended September 30, -------------------------------- ------------------------------- 1997 1996 1997 1996 ---- ---- ---- ---- Net income $ 8,258 $ 6,670 $15,265 $11,819 ======= ======= ======= ======= 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 172 176 175 146 ------- ------- ------- ------- Outstanding shares for primary earnings per share calculation 27,172 27,176 27,175 27,146 ======= ======= ======= ======= Earnings per common share: $ 0.30 $ 0.25 $ 0.56 $ 0.44 ======= ======= ======= =======