Exhibit 12

ONEOK, Inc.
Computation of Ratio of Earnings to Fixed Charges
	Years Ended December 31,
(Unaudited)	2017			2016			2015			2014			2013
	(Thousands of dollars)
Fixed charges, as defined
Interest on long-term debt	$	436,069		$	438,915		$	432,234		$	380,441		$	374,520
Other interest	44,041			32,385			13,330			4,127			10,397
Amortization of debt discount, premium and expense	11,057			8,943			7,795			6,652			7,064
Interest on lease agreements	1,149			1,150			962			275			1,494
Total fixed charges	492,316			481,393			454,321			391,495			393,475
Earnings before income taxes and undistributed income of equity method investees	1,049,460			958,659			670,762			854,181			709,825
Earnings available for fixed charges	$	1,541,776		$	1,440,052		$	1,125,083		$	1,245,676		$	1,103,300
Ratio of earnings to fixed charges	3.13		x	2.99		x	2.48		x	3.18		x	2.80		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.