9. Earnings Per Share

6 Months Ended

Jun. 30, 2013

9. EARNINGS PER SHARE

Basic earnings per share is computed by dividing net income attributable to Bio-Rad by the weighted average number of common shares outstanding for that period. Diluted earnings per share takes into account the effect of dilutive instruments, such as stock options and restricted stock, and uses the average share price for the period in determining the number of potential common shares that are to be added to the weighted average number of shares outstanding. Potential common shares are excluded from the diluted earnings per share calculation if the effect of including such securities would be anti-dilutive.

The weighted average number of common shares outstanding used to calculate basic and diluted earnings per share, and the anti-dilutive shares that are excluded from the diluted earnings per share calculation are as follows (in thousands):



	Three Months Ended		Six Months Ended
	June 30,		June 30,
	2013	2012	2013	2012
Basic weighted average shares outstanding	28,538	28,250	28,516	28,226
Effect of potentially dilutive stock options and restricted stock awards	330	360	327	356
Diluted weighted average common shares	28,868	28,610	28,843	28,582
Anti-dilutive shares	92	91	92	93

- Definition

The entire disclosure for earnings per share.

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