Exhibit (12)(a)

S&T Bancorp, Inc.

Computations of Consolidated Ratios of Earnings to Fixed Charges

(000’s)

		Six Months Ended				Years Ended December 31,
		June 30, 2009 (1)				2008				2007				2006				2005				2004
Excluding Interest on Deposits
Fixed Charges:
Interest Expense (excluding interest on deposits)		$	6,060			$	19,808			$	19,580			$	18,055			$	14,690			$	10,258
Interest Factor Within Rent Expense			309				566				498				456				398				326
Total Fixed Charges		$	6,369			$	20,374			$	20,078			$	18,511			$	15,088			$	10,584
Earnings:
Income Before Income Taxes		$	(19,606	)		$	84,720			$	77,771			$	74,849			$	82,530			$	77,359
Fixed Charges			6,369				20,374				20,078				18,511				15,088				10,584
		$	(13,237	)		$	105,094			$	97,849			$	93,360			$	97,618			$	87,943
			(2.08	)X			5.16	X			4.87	X			5.04	X			6.47	X			8.31	X
Including Interest on Deposits
Fixed Charges:
Interest Expense		$	26,956			$	72,171			$	99,167			$	91,584			$	59,514			$	40,890
Interest Factor Within Rent Expense			309				566				498				456				398				326
Total Fixed Charges		$	27,265			$	72,737			$	99,665			$	92,040			$	59,912			$	41,216
Earnings:
Income Before Income Taxes		$	(19,606	)		$	84,720			$	77,771			$	74,849			$	82,530			$	77,359
Fixed Charges			27,265				72,737				99,665				92,040				59,912				41,216
		$	7,659			$	157,457			$	177,436			$	166,889			$	142,442			$	118,575
Ratio of Earnings to Fixed Charges			0.28	X			2.16	X			1.78	X			1.81	X			2.38	X			2.88	X

(1) The shortfall on the one-to-one coverage for the six months ended June 30, 2009 is due to the YTD pre-tax loss of $19,606,000.