展览12.1

KLA-Tencor Corporation

Computation of Ratio of Earnings to Fixed Charges

Fiscal year ended June 30,

(In thousands, except ratios)

2010 2009 2008 2007 2006

Earnings (losses):

所得税前收入(亏损)es

$ 291,181 $ (602,531 ) $ 560,234 $ 677,235 $ 377,858

Add back (deduct) fixed charges:

Interest expense

54,517 55,339 10,767 2,781 2175年

Amortization of bond issuance costs

735 735 123 0 0

Interest portion of rental expense

3,687 4,114 3,824 3,243 2,788

Total adjusted earnings (losses)

$ 350,120 $ (542,343 ) $ 574,948 $ 683,259 $ 382,821

Fixed charges:

Interest expense

$ 54,517 $ 55,339 $ 10,767 $ 2,781 $ 2175年

Amortization of bond issuance costs

735 735 123 0 0

Interest portion of rental expense

3,687 4,114 3,824 3,243 2,788

Total fixed charges

$ 58,939 $ 60,188 $ 14,714 $ 6,024 $ 4,963

Ratio of earnings to fixed charges

5.9 (a ) 39.1 113.4 77.1

(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.

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