EXHIBIT 12.1 ONEOK INC. AND SUBSIDIARIES COMPUTATION OF RATIO OF EARNINGS TO COMBINED FIXED CHARGES AND PREFERRED STOCK DIVIDEND REQUIREMENTS (IN THOUSANDS) YEARS ENDED AUGUST 31, SIX MONTHS ENDED --------------------------------------------- ------------------------- FEBRUARY 28, FEBRUARY 29, 1996 1995 1994 1993 1992 1997 1996 -------- -------- ------- ------- ------- ------------ ------------ (UNAUDITED) Fixed charges, as de- fined: Interest on long-term debt................. $ 31,748 $ 32,401 $32,988 $35,250 $32,445 $15,681 $15,981 Other interest........ 3,184 4,878 1,846 1,120 3,110 1,988 2,108 Amortization of debt issue costs.......... 530 512 525 2,117 526 271 276 -------- -------- ------- ------- ------- ------- ------- Total fixed charges............ 35,462 37,791 35,359 38,487 36,081 17,940 18,365 Preferred dividend re- quirement.............. 428 428 428 428 428 214 214 -------- -------- ------- ------- ------- ------- ------- Total fixed charges and preferred stock dividend requirements....... $ 35,890 $ 38,219 $35,787 $38,915 $36,509 $18,154 $18,579 ======== ======== ======= ======= ======= ======= ======= Earnings, as defined: Income before income taxes................ $ 85,873 $ 68,146 $57,276 $59,230 $51,456 81,897 76,083 Total fixed charges (as shown above)..... 35,462 37,791 35,359 38,487 36,081 17,940 18,365 -------- -------- ------- ------- ------- ------- ------- Earnings available for fixed charges and preferred dividend requirements....... $121,335 $105,937 $92,635 $97,717 $87,537 $99,837 $94,448 ======== ======== ======= ======= ======= ======= ======= Ratio of earnings to combined fixed charges and preferred dividend requirements........... 3.38x 2.77x 2.59x 2.51x 2.40x 5.50x 5.08x ======== ======== ======= ======= ======= ======= =======