Exhibit 12.1

United States Steel Corporation

Computation of Ratio of Earnings to Combined Fixed Charges

and Preferred Stock Dividends

Unaudited

	Year Ended December 31,
(Dollars in Millions)	2005		2004*		2003*			2002*		2001*
Portion of rentals representing interest	$	45	$	51	$	46		$	34	$	45
Capitalized interest		12		8		8			6		1
Other interest and fixed charges		87		131		156			136		153
Pretax earnings which would be required to cover preferred stock dividend requirements		25		23		35			—		12
Combined fixed charges and preferred stock dividends (A)	$	169	$	213	$	245		$	176	$	211
Earnings-pretax income with applicable adjustments (B)	$	1,467	$	1,687	$	(559	)	$	202	$	(382	)
Ratio of (B) to (A)		8.68		7.92		(a	)		1.15		(b	)

* During the fourth quarter of 2005, U.S. Steel changed its method of determining the cost of U. S. Steel Kosice’s inventories from the last-in, first-out method to the first-in, first-out method. Prior year results have been adjusted to apply this change retrospectively.

(a) Earnings did not cover fixed charges and preferred stock dividends by $804 million.

(b) Earnings did not cover fixed charges and preferred stock dividends by $593 million.