| EXHIBIT 12 - COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

METALDYNE PERFORMANCE GROUP INC. |   |
|--------------------------------------------------------------------------------------------------|--------|
|                                                                                             |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|                                                                                             |   | Year Ended December 31, |   |   | Successor Period |   |   |   | Predecessor Period |   |
|                                                                                             |   | 2016 |   |   | 2015 |   |   | 2014 |   |   | 2013 |   |   | 2012 |   |   |   | 2012 |   |
|                                                                                             |   | (In millions) |   |
| Earnings Available for Fixed Charges:                                                            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Income (loss) before tax                                                                         |   | $ | 135.3 |   |   |   | 173.9 |   |   |   | 54.2 |   |   |   | 92.9 |   |   |   | (47.1 | ) |   |   |   | (36.7 | ) |
| Add: fixed charges included in earnings:                                                         |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Interest expense                                                                                 |   |   | 103.5 |   |   |   | 107.5 |   |   |   | 99.9 |   |   |   | 74.7 |   |   |   | 11.1 |   |   |   |   | 25.8 |   |
| Interest element of rentals                                                                      |   |   | 0.8 |   |   |   | 0.7 |   |   |   | 0.8 |   |   |   | 0.8 |   |   |   | — |   |   |   |   | 0.4 |   |
| Total                                                                                            |   |   | 104.3 |   |   |   | 108.2 |   |   |   | 100.7 |   |   |   | 75.5 |   |   |   | 11.1 |   |   |   |   | 26.2 |   |
| Total earnings available for fixed charges                                                       |   | $ | 239.6 |   |   |   | 282.1 |   |   |   | 154.9 |   |   |   | 168.4 |   |   |   | (36.0 | ) |   |   |   | (10.5 | ) |
|                                                                                             |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Fixed Charges:                                                                                   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Fixed charges included in earnings                                                               |   | $ | 104.3 |   |   |   | 108.2 |   |   |   | 100.7 |   |   |   | 75.5 |   |   |   | 11.1 |   |   |   |   | 26.2 |   |
|                                                                                             |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Ratio of Earnings to Fixed Charges                                                               |   |   | 2.3 |   |   |   | 2.6 |   |   |   | 1.5 |   |   |   | 2.2 |   |   |   | (3.2 | ) |   |   |   | (0.4 | ) |
| Amount of Deficiency                                                                             |   | Not applicable |   |   | Not applicable |   |   | Not applicable |   |   | Not applicable |   |   |   | 47.1 |   |   |   |   | 36.7 |   |