Exhibit 12

ONEOK Partners, L.P.
Computation of Ratio of Earnings to Fixed Charges
	Years Ended December 31,
(Unaudited)	2016			2015			2014			2013			2012
	(Thousands of dollars)
Fixed charges, as defined
Interest on long-term debt	$	339,799		$	357,069		$	326,299		$	284,589		$	238,706
Other interest	33,907			14,176			4,695			3,688			4,026
Amortization of debt discount, premium and expense	6,416			6,386			5,727			4,944			3,767
Interest on lease agreements	1,031			880			205			310			286
Total fixed charges	381,153			378,511			336,926			293,531			246,785
Earnings before income taxes and undistributed income of equity method investees	1,086,187			750,902			958,311			769,495			863,736
Earnings available for fixed charges	$	1,467,340		$	1,129,413		$	1,295,237		$	1,063,026		$	1,110,521
Ratio of earnings to fixed charges	3.85		x	2.98		x	3.84		x	3.62		x	4.50		x

For purposes of computing the ratio of earnings to fixed charges, “earnings” consists of pretax income from continuing operations before adjustment for income or loss from equity investees plus fixed charges and distributed income of equity investees, less interest capitalized. “Fixed charges” consists of interest charges, the amortization of debt discounts and issue costs and the representative interest portion of operating leases.