Exhibit 11 ITT EDUCATIONAL SERVICES, INC. COMPUTATION OF BASIC AND DILUTED EARNINGS PER SHARE (In thousands, except per share data) Three Months Ended September 30, Nine Months Ended September 30, --------------------------------- ------------------------------- 2000 1999 2000 1999 ---- ---- ---- ---- Net income $ 7,473 $ 10,050 $ 12,536 $ 17,820 ============= =============== ============ ============= Shares: Weighted average number of shares of common stock outstanding 23,912 24,935 24,147 25,424 Shares assumed issued (less shares assumed purchased for treasury) on stock options 234 97 158 162 ------------- --------------- ------------ -------------- Outstanding shares for diluted earnings per share calculation 24,146 25,032 24,305 25,586 ============= =============== ============ ============== Earnings per common share: Basic $ 0.31 $ 0.40 $ 0.52 $ 0.70 Diluted $ 0.31 $ 0.40 $ 0.52 $ 0.70