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, --------------------------------------- ------------------------------------ 1999 1998 1999 1998 ---- ---- ---- ---- Net income (loss) $ 1,251 $ (660) $ 7,770 $ 6,668 ----------------- ----------------- --------------- ---------------- ----------------- ----------------- --------------- ---------------- Shares: Weighted average number of shares of common stock outstanding 25,279 27,000 25,668 27,000 Shares assumed issued less shares assumed purchased on stock options 151 183 195 163 ----------------- ----------------- --------------- ---------------- Outstanding shares for diluted earnings per share calculation 151 183 195 163 ---------------- ---------------- ---------------- ---------------- ---------------- ---------------- ---------------- ---------------- Earnings (loss) per common share: Basic $ 0.05 $ (0.02) $ 0.30 $ 0.25 Diluted $ 0.05 $ (0.02) $ 0.30 $ 0.25