Exhibit 11.1 FAIR, ISAAC AND COMPANY, INCORPORATED COMPUTATION OF EARNINGS PER SHARE (IN THOUSANDS EXCEPT PER SHARE DATA) Nine-Months Ended Three-Months Ended June 30 June 30 ------------------------- ------------------------- 1997 1996 1997 1996 ------- ------- ------- ------- Primary Earnings Per Share: Weighted Average Common Shares Outstanding 12,659 12,380 12,703 12,392 Dilutive effect of outstanding options (as determined by the treasury stock method) 439 360 420 353 ------- ------- ------- ------- Weighted Average Common Shares, as Adjusted 13,098 12,740 13,123 12,745 ======= ======= ======= ======= Net Income $13,732 $12,196 $ 4,155 $ 4,298 ======= ======= ======= ======= Primary Earnings per Share $ 1.05 $ 0.96 $ 0.32 $ 0.34 ======= ======= ======= ======= Fully Diluted Earnings Per Share: Weighted Average Common Shares Outstanding 12,659 12,380 12,703 12,392 Dilutive effect of outstanding options (as determined by the treasury stock method) 640 467 538 379 ------- ------- ------- ------- Weighted Average Common Shares, as Adjusted 13,299 12,847 13,241 12,771 ======= ======= ======= ======= Net Income $13,732 $12,196 $ 4,155 $ 4,298 ======= ======= ======= ======= Fully Diluted Earnings Per Share $ 1.03 $ 0.95 $ 0.31 $ 0.34 ======= ======= ======= ======= 16