following table presents the calculation of basic and diluted earnings per share: | | | | | | | | | | | | | | | | | | | | Three Months Ended | | Six Months Ended | | | June 30, | | June 30, | (MILLIONS OF DOLLARS AND SHARES, EXCEPT PER SHARE DATA) | | 2019 | | 2018 | | 2019 | | 2018 | Numerator | | | | | | | | | Net income before allocation to noncontrolling interests | | $ | 371 |
| | $ | 382 |
| | $ | 683 |
| | $ | 732 |
| Less: Net loss attributable to noncontrolling interests | | — |
| | (2 | ) | | — |
| | (4 | ) | Net income attributable to Zoetis Inc. | | $ | 371 |
| | $ | 384 |
| | $ | 683 |
| | $ | 736 |
| Denominator | | | | | | | | | Weighted-average common shares outstanding | | 478.8 |
| | 483.8 |
| | 479.2 |
| | 484.8 |
| Common stock equivalents: stock options, RSUs, PSUs and DSUs | | 3.5 |
| | 3.7 |
| | 3.5 |
| | 3.8 |
| Weighted-average common and potential dilutive shares outstanding | | 482.3 |
| | 487.5 |
| | 482.7 |
| | 488.6 |
| | | | | | | | | | Earnings per share attributable to Zoetis Inc. stockholders—basic | | $ | 0.77 |
| | $ | 0.79 |
| | $ | 1.43 |
| | $ | 1.52 |
| Earnings per share attributable to Zoetis Inc. stockholders—diluted | | $ | 0.77 |
| | $ | 0.79 |
| | $ | 1.41 |
| | $ | 1.51 |
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The number of stock options outstanding under the company's Equity Plan that were excluded from the computation of diluted earnings per share, as the effect would have been antidilutive, were de minimis and $1 million for the three months ended June 30, 2019 and June 30, 2018, respectively and de minimis for the six months ended June 30, 2019 and June 30, 2018, respectively.
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