Exhibit 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:

               

Interest expense

      10,767      2,781      2,175      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      4,141
                                  

Total adjusted earnings

      574,948      683,259      382,821      588,717      275,048

Fixed charges:

               

Interest expense

      10,767      2,781      2,175      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      4,141
                                  

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.