Exhibit 11 OIL-DRI CORPORATION OF AMERICA AND SUBSIDIARIES COMPUTATION OF EARNINGS PER SHARE (IN THOUSANDS EXCEPT FOR PER SHARE AMOUNTS) --------------------------------------------- Three Months Ended Nine Months Ended April 30 April 30 ----------------------- --------------------- 1999 1998 1999 1998 ----------------------- --------------------- Net income available to stockholders (numerator) $ 1,195 $ 1,389 $ 5,499 $ 3,165 ======= ======= ======= ======= Shares Calculation (denominator) Average shares outstanding - basic 5,813 6,053 5,846 6,197 Effect of Dilutive Securities: Potential Common Stock relating to stock options 223 17 149 35 ------- ------- ------- ------- Average shares outstanding - assuming dilution 6,036 6,070 5,995 6,232 ======= ======= ======= ======= Net Income (Loss) Per Share: Basic $ 0.21 $ 0.23 $ 0.94 $ 0.51 ======= ======= ======= ======= Dilutive $ 0.20 $ 0.23 $ 0.92 $ 0.51 ======= ======= ======= =======