Basic and diluted income per common share attributable to common stockholders are calculated using the weighted average number of common shares outstanding for the period. Diluted income per common share attributable to common stockholders is computed by dividing the income allocated to common stockholders by the weighted average number of fully diluted common shares outstanding. In periods of a net loss, no potential common shares are included in diluted shares outstanding as the effect is anti-dilutive. For the 13 weeks ended March 29, 2020, and March 31, 2019, the Company had a loss per share, and therefore potentially dilutive shares were excluded from the calculation.

	For the 13 Weeks Ended
	March 29,			March 31,
	2020			2019
Net loss attributable to Potbelly Corporation	$	(13,336	)	$	(18,439	)
Weighted average common shares outstanding-basic		23,646			24,133
Plus: Effect of potential stock options exercise		—			—
Weighted average common shares outstanding-diluted		23,646			24,133
Loss per share available to common stockholders-basic	$	(0.56	)	$	(0.76	)
Loss per share available to common stockholders-diluted	$	(0.56	)	$	(0.76	)
Potentially dilutive shares that are considered anti-dilutive:
Common share options		2,294			2,387