Exhibit 11.1 ------------- RESMED INC AND SUBSIDIARIES COMPUTATION OF EARNINGS PER COMMON SHARE (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS) Year Ended June 30, -------------------- 1999 1998 1997 -------- -------- ------- BASIC EARNINGS Net income . . . . . . . . . . . . . . . . . $ 16,102 10,611 7,465 ======= ======= ====== Shares Weighted average number of common shares outstanding. . . . . . . . . . . . 14,708 14,500 14,378 ======= ======= ====== Basic earnings per share . . . . . . . . . . $ 1.09 $ 0.73 $ 0.52 ======= ======= ====== DILUTED EARNINGS Net income . . . . . . . . . . . . . . . . . $ 16,102 $ 10,611 7,465 ======= ======= ====== Shares Weighted average number of common shares outstanding. . . . . . . . . . . . 14,708 14,500 14,378 Additional shares assuming conversion of stock options under treasury stock method 826 522 256 _______ _______ ______ Weighted average number of common and common equivalent shares outstanding as adjusted . . . . . . . . . . . . . . . 15,534 15,022 14,634 ======= ======= ====== Diluted earnings per share . . . . . . . . $ 1.04 $ 0.71 $ 0.51 ======= ======= ======