Earnings per Share

3 Months Ended

Mar. 31, 2021

14. Earnings per Share

The following table presents the calculation of basic and diluted earnings per share:


	Three Months Ended
	March 31,
(MILLIONS OF DOLLARS AND SHARES, EXCEPT PER SHARE DATA)		2021		2020
Numerator
Net income before allocation to noncontrolling interests		$	558	$	423
Less: Net loss attributable to noncontrolling interests		(1)		—
Net income attributable to Zoetis Inc.		$	559	$	423
Denominator
Weighted-average common shares outstanding		475.5		475.6
Common stock equivalents: stock options, RSUs, PSUs and DSUs		2.4		3.4
Weighted-average common and potential dilutive shares outstanding		477.9		479.0

Earnings per share attributable to Zoetis Inc. stockholders—basic		$	1.18	$	0.89
Earnings per share attributable to Zoetis Inc. stockholders—diluted		$	1.17	$	0.88

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 for the three months ended March 31, 2021 and 2020.