EXHIBIT 12

ONEOK, Inc.

Computation of Ratio of Earnings to Combined Fixed Charges

and Preferred Stock Dividend Requirements

	Years Ended December 31,
(Unaudited)	2006			2005			2004			2003			2002
	(Thousands of dollars)
Fixed Charges, as defined
Interest on long-term debt	$	231,117		$	116,642		$	78,349		$	87,382		$	78,414
Other interest		4,493			27,031			5,239			5,873			10,523
Amortization of debt discount and expense		4,115			3,935			3,713			4,977			7,949
Interest on lease agreements		12,738			20,781			21,638			21,323			22,831
Total Fixed Charges		252,463			168,389			108,939			119,555			119,717
Preferred dividend requirements		-			-			-			37,536			60,820
Total fixed charges and preferred dividend requirements	$	252,463		$	168,389		$	108,939		$	157,091		$	180,537
Earnings before income taxes and income from equity investees	$	626,558		$	643,131		$	359,493		$	332,246		$	242,446
Total fixed charges		252,463			168,389			108,939			119,555			119,717
Earnings available for combined fixed charges and preferred stock dividend requirements	$	879,021		$	811,520		$	468,432		$	451,801		$	362,163
Ratio of Earnings to combined fixed charges and preferred stock dividend requirements		3.48	x		4.82	x		4.30	x		2.88	x		2.01	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.