Exhibit 12.1

ONEOK Partners, L.P.

Computation of Ratio of Earnings to Fixed Charges



|                                                                            |  |                                  |         |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   |         |  
|--------------------------------------------------------------------------- |  | -------------------------------- | ------- | - | ---- | - | ------- | ---- |  | - | ------- | - |  | ---- | ------- | - |  | - | ------- | -
|                                                                            |  | Twelve months ended December 31, |        
|(Unaudited)                                                                 |  | 2002                             |         |   | 2003 |   |         | 2004 |  |   | 2005    |   |  | 2006 |        
|                                                                            |  | (Thousands of dollars)           |        
|Fixes Charges, as defined                                                   |  |                                  |         |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   |         |  
|Interest on long-term debt                                                  |  | $                                | 82,128  |   |      | $ | 80,653  |      |  | $ | 79,020  |   |  | $    | 90,066  |   |  | $ | 135,337 |  
|Other interest                                                              |  |                                  |        |   |      |   | 45      |      |  |   | 15      |   |  |      | 3       |   |  |   | 439     |  
|Amortization of debt discount, premium and expense                          |  |                                  | 1,100   |   |      |   | (1,539  | )    |  |   | (1,690  | ) |  |      | (2,379  | ) |  |   | (2,294  | )
|Interest on lease agreements                                                |  |                                  | 1,112   |   |      |   | 1,210   |      |  |   | 1,192   |   |  |      | 1,522   |   |  |   | 1,018   |  
|                                                                            |  |                                  |         |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   |         |  
|Total Fixed Charges                                                         |  |                                  | 84,340  |   |      |   | 80,369  |      |  |   | 78,537  |   |  |      | 89,212  |   |  |   | 134,500 |  
|                                                                            |  |                                  |         |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   |         |  
|Earnings before income taxes and undistributed income from equity investees |  |                                  | 152,974 |   |      |   | (49,244 | )    |  |   | 190,245 |   |  |      | 189,050 |   |  |   | 502,272 |  
|                                                                            |  |                                  |         |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   |         |  
|Earnings available for fixed charges                                        |  | $                                | 237,314 |   |      | $ | 31,125  |      |  | $ | 268,782 |   |  | $    | 278,262 |   |  | $ | 636,772 |  
|                                                                            |  |                                  |         |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   |         |  
|Ratio of earnings to fixed charges                                          |  |                                  | 2.81    | x |      |   | 0.39    | x    |  |   | 3.42    | x |  |      | 3.12    | x |  |   | 4.73    | x
|                                                                            |  |                                  |         |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   |         |  

For purposes of computing the ratio of earnings to fixed charges, earnings consists of income before
cumulative effect of a change in accounting principle plus fixed charges and income taxes, less undistributed income for equity investees. Fixed charges consists of interest charges, the amortization of debt discounts, premiums, issue
costs and the representative interest portion of operating leases.