Marathon Oil (MRO) 10-Q 2007 Q3 Quarterly report

Exhibit 12.1

Marathon Oil Corporation

Computation of Ratio of Earnings to Fixed Charges

TOTAL ENTERPRISE BASIS - Unaudited

(Dollars in Millions)

	Nine Months Ended September 30				Year Ended December 31
	2007		2006		2006		2005		2004		2003		2002
Portion of rentals representing interest	$	74	$	53	$	75	$	62	$	57	$	63	$	66
Capitalized interest, including discontinued operations	150		107		152		83		48		41		16
Other interest and fixed charges, including discontinued operations	74		137		147		240		279		270		316
Total fixed charges (A)	$	298	$	297	$	374	$	385	$	384	$	374	$	398
Earnings-pretax income with applicable adjustments (B)	$	5,923	$	7,122	$	9,014	$	4,557	$	2,905	$	2,421	$	1,446
Ratio of (B) to (A)	19.88		23.98		24.10		11.84		7.57		6.47		3.63