Exhibit 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):

             

Income (loss) before income taxes

   $ 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      2,175

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    $ 2,175

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.