Exhibit 12.1

ONEOK Partners, L.P.

Computation of Ratio of Earnings to Fixed Charges



|                                                                            |  |                          |         |   |      |   |         |  
|--------------------------------------------------------------------------- |  | ------------------------ | ------- | - | ---- | - | ------- | -
|                                                                            |  | Six months endedJune 30, |        
|(Unaudited)                                                                 |  | 2006                     |         |   | 2005 |  
|                                                                            |  | (Thousands of dollars)   |        
|                                                                            |  |                         
|Fixes Charges, as defined                                                   |  |                          |         |   |      |   |         |  
|Interest on long-term debt                                                  |  | $                        | 68,204  |   |      | $ | 43,377  |  
|Other interest                                                              |  |                          | 305     |   |      |   | 140     |  
|Amortization of debt discount, premium and expense                          |  |                          | (1,288  | ) |      |   | (979    | )
|Interest on lease agreements                                                |  |                          | 591     |   |      |   | 761     |  
|                                                                            |  |                          |         |   |      |   |         |  
|Total Fixed Charges                                                         |  |                          | 67,812  |   |      |   | 43,299  |  
|                                                                            |  |                          |         |   |      |   |         |  
|Earnings before income taxes and undistributed income from equity investees |  |                          | 314,321 |   |      |   | 78,483  |  
|                                                                            |  |                          |         |   |      |   |         |  
|Earnings available for fixed charges                                        |  | $                        | 382,133 |   |      | $ | 121,782 |  
|                                                                            |  |                          |         |   |      |   |         |  
|Ratio of earnings to fixed charges                                          |  |                          | 5.64    | x |      |   | 2.81    | 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.