<PAGE>
Exhibit 11
ITT EDUCATIONAL SERVICES, INC.
COMPUTATION OF BASIC AND DILUTED EARNINGS PER SHARE
(In thousands, except per share data)
<TABLE>
<CAPTION>
Three Months Ended September 30, Nine Months Ended September 30,
--------------------------------- -------------------------------
2000 1999 2000 1999
---- ---- ---- ----
<S> <C> <C> <C> <C>
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
</TABLE>