13 Exhibit 11 OIL-DRI CORPORATION OF AMERICA AND SUBSIDIARIES COMPUTATION OF EARNINGS PER SHARE (IN THOUSANDS EXCEPT FOR PER SHARE AMOUNTS) ------------------------ Three Months Ended October 31 ------------------------ 1998 1997 ------------------------ Net income available to Stockholders (numerator) $2,028 $1,872 ------ ------ Shares Calculation (denominator): Average shares outstanding - basic 5,881 6,274 Effect of Dilutive Securities: Potential Common Stock relating to stock options 48 53 ------ ------ Average shares outstanding- assuming dilution 5,929 6,327 ====== ====== Earnings per share-basic $ 0.34 $ 0.30 ====== ====== Earnings per share-assuming dilution $ 0.34 $ 0.30 ====== ======