Exhibit 12

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

AtriCure, Inc. and Subsidiaries

Computation of Ratio of Earnings to Fixed Charges (in thousands)

As of September 30, 2013

	Nine Months ended September 30,			Fiscal Years
	2013			2012			2011			2010			2009			2008
Earnings:
Income (loss) before income taxes	$	(6,468	)	$	(7,484	)	$	(5,425	)	$	(3,773	)	$	(16,554	)	$	(10,225	)
Fixed charges to add to earnings:
Interest expense		359			702			643			751			622			332
Amortization of financing costs		69			100			171			111			190			32
Rent interest factor (1)		156			197			169			157			161			142
Total fixed charges		584			999			983			1,019			973			506
Earnings before income taxes and fixed charges	$	(5,884	)	$	(6,485	)	$	(4,442	)	$	(2,754	)	$	(15,581	)	$	(9,719	)
Ratio of earnings to fixed charges		N/A			N/A			N/A			N/A			N/A			N/A

Ratio of earnings to fixed charges is not applicable as the Company is deficient in earnings by $5,884, $6,485, $4,442, $2,754, $15,581, and $9,719 for the nine months ended September 30, 2013 and fiscal years ending 2012, 2011, 2010, 2009, and 2008, respectively.

(1) Approximately one-third of rental expense is deemed representative of the interest factor.