展览12.1

KLA-Tencor Corporation

Computation of Ratio of Earnings to Fixed Charges

Fiscal year ended June 30,

(in thousands, except ratios)

2008 2007 2006 2005 2004

Earnings:

Income before income taxes and minority interest

$ 560,234 $ 677,235 $ 377,858 $ 583,076 $ 270,388

Add back fixed charges:

利息费用

10,767 2,781 2175年 1,750 519

Amortization of bond issuance costs

123 0 0 0 0

Interest portion of rental expense

3,824 3,243 2,788 3,891 4141年

Total adjusted earnings

574,948 683,259 382,821 588717年 275,048

Fixed charges:

利息费用

10,767 2,781 2175年 1,750 519

Amortization of bond issuance costs

123 0 0 0 0

Interest portion of rental expense

3,824 3,243 2,788 3,891 4141年

Total fixed charges

14,714 6,024 4,963 5,641 4,660

Ratio of earnings to fixed charges

39.1 113.4 77.1 104.4 59.0

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

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