EXHIBIT 12

ONEOK, Inc.

Computation of Ratio of Earnings to Combined Fixed Charges

and Preferred Stock Dividend Requirements

	Years Ended December 31,
(Unaudited)	2005		2004		2003		2002		2001
	(Thousands of dollars)
Fixed Charges, as defined
Interest on long-term debt	$	116,642	$	78,349	$	87,382	$	78,414	$	99,530
Other interest		27,031		5,239		5,873		10,523		27,454
Amortization of debt discount and expense		3,935		3,713		4,977		7,949		3,475
Interest on lease agreements		20,781		21,638		21,323		22,831		21,564
Total Fixed Charges		168,389		108,939		119,555		119,717		152,023
Preferred dividend requirements		—		—		37,536		60,820		59,839
Total fixed charges and preferred dividend requirements	$	168,389	$	108,939	$	157,091	$	180,537	$	211,862
Earnings before income taxes and income from equity investees	$	655,374	$	360,388	$	332,246	$	242,446	$	51,877
Total fixed charges		168,389		108,939		119,555		119,717		152,023
Earnings available for combined fixed charges and preferred stock dividend requirements	$	823,763	$	469,327	$	451,801	$	362,163	$	203,900
Ratio of Earnings to combined fixed charges and preferred stock dividend requirements		4.89 x		4.31 x		2.88 x		2.01 x		0.96 x

For purposes of computing the ratio of earnings to combined fixed charges and preferred stock dividend requirements, “earnings” consists of income before cumulative effect of a change in accounting principle plus fixed charges and income taxes, less undistributed income for equity investees. “Fixed charges” consists of interest charges, the amortization of debt discounts and issue costs and the representative interest portion of operating leases. “Preferred dividend requirements” consists of the pre-tax preferred dividend requirement.