Exhibit 11.1 FAIR, ISAAC AND COMPANY, INCORPORATED COMPUTATION OF EARNINGS PER SHARE (IN THOUSANDS EXCEPT PER SHARE DATA) Year Ended September 30, 1997 1996 1995 ----------- ----------- ----------- Primary Earnings Per Share: Weighted Average Common Shares Outstanding 13,386 13,161 12,867 Dilutive effect of outstanding options (as determined by the treasury stock method) 816 761 826 ----------- ----------- ----------- Weighted Average Common Shares outstanding, as Adjusted 14,202 13,922 13,693 =========== =========== =========== Net Income $ 20,686 $ 17,423 $ 12,753 =========== =========== =========== Primary Earnings per Share $ 1.46 $ 1.25 $ .93 =========== =========== =========== Fully Diluted Earnings Per Share: Weighted Average Common Shares Outstanding 13,386 13,161 12,867 Dilutive effect of outstanding options (as determined by the treasury stock method) 907 809 870 ----------- ----------- ------------ Weighted Average Common Shares, as Adjusted 14,293 13,970 13,737 =========== =========== ============ Net Income $ 20,686 $ 17,423 $ 12,753 =========== =========== ============ Fully Diluted Earnings Per Share $ 1.45 $ 1.25 $ .93 =========== =========== ============