EXHIBIT 12

McKESSON CORPORATION
CALCULATION OF RATIO OF EARNINGS TO FIXED CHARGES

	Years Ended March 31,
(In millions)	2005			2004			2003			2002			2001
Earnings:
Income (loss) from continuing operations before income taxes	$	(239.8	)	$	911.4		$	851.4		$	602.1			$	4.6
Adjustments:
Equity in net income of and dividends from equity investees		24.2			(1.1	)		(5.6	)		1.8				(2.8	)
Fixed charges		162.6			160.9			167.9			164.4				162.0
Interest capitalized		(6.1	)		(3.7	)		(3.3	)		(1.8	)			(2.0	)
Earnings as adjusted	$	(59.1	)	$	1,067.5		$	1,010.4		$	766.5			$	161.8
Fixed charges:
Interest expense (a)	$	118.0		$	120.2		$	128.1		$	125.9			$	123.8
Portion of rental expense representative of the interest factor		38.5			37.0			36.5			36.7				36.2
Capitalized interest		6.1			3.7			3.3			1.8				2.0
Total fixed charges	$	162.6		$	160.9		$	167.9		$	164.4			$	162.0
Ratio:
Ratio of earnings to fixed charges		(b	)		6.6	X		6.0	X		4.7	X			1.0	X

(a)     Interest expense includes amortization of debt discounts and deferred loan costs.

(b)     Earnings for the year ended March 31, 2005 were inadequate to cover fixed charges.
          The coverage deficiency was $221.7 million for the ratio of earnings to fixed charges.