Exhibit 12.1

KLA-Tencor Corporation

Computation of Ratio of Earnings to Fixed Charges

 

	Fiscal year ended June 30,
(In thousands, except ratios)	2012				2011				2010				2009				2008
Earnings (losses):
Income (loss) before income taxes	$	974,094			$	1,110,066			$	291,181			$	(602,531	)		$	560,234
Add back fixed charges:
Interest expense	54,197				54,328				54,517				55,339				10,767
Amortization of bond issuance costs	735				735				735				735				123
Interest portion of rental expense	3,008				2,834				3,687				4,114				3,824
Total adjusted earnings (losses)	$	1,032,034			$	1,167,963			$	350,120			$	(542,343	)		$	574,948
Fixed charges:
Interest expense	$	54,197			$	54,328			$	54,517			$	55,339			$	10,767
Amortization of bond issuance costs	735				735				735				735				123
Interest portion of rental expense	3,008				2,834				3,687				4,114				3,824
Total fixed charges	$	57,940			$	57,897			$	58,939			$	60,188			$	14,714
Ratio of earnings to fixed charges	17.8				20.2				5.9				(a)				39.1

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(a) Earnings were inadequate to cover the fixed charges by $602.5 million in the fiscal year ended June 30, 2009.

For purposes of calculating the ratio of earnings to fixed charges, earnings is the amount resulting from adding earnings before income taxes, plus fixed charges. Fixed charges for these purposes include interest expense, amortization of bond issuance costs, and one-third of rental expense, which KLA-Tencor considers to be a reasonable approximation of the interest factor included in rental expense.