Masimo (MASI) 10-Q 2011 Q1 Quarterly report

Exhibit 12.1

Masimo Corporation

Ratio of Earnings to Fixed Charges

(dollars in thousands)

	Three months ended April 2, 2011			Fiscal Year Ended
				January 1, 2011			January 2, 2010			January 3, 2009		December 29, 2007		December 31, 2006
Ratio of earnings to fixed charges:
Income before provision for income taxes	$	25,583		$	107,569		$	82,180		$	72,391	$	68,122	$	314,403
Fixed charges		449			1,941			1,768			2,435		3,831		2,882
Noncontrolling interests in pre-tax income		(266	)		(676	)		(1,159	)		—		—		—
Total earnings	$	25,766		$	108,834		$	82,789		$	74,826	$	71,953	$	317,285
Fixed charges
Interest expensed	$	3		$	23		$	75		$	753	$	2,475	$	1,824
Estimate of interest within rental expense		446			1,918			1,693			1,682		1,356		1,058
Total fixed charges	$	449		$	1,941		$	1,768		$	2,435	$	3,831	$	2,882
Ratio of earnings to fixed charges		57.39			56.07			46.83			30.73		18.78		110.09
Ratio of earnings to fixed charges and preferred stock dividends:
Income before provision for income taxes	$	25,583		$	107,569		$	82,180		$	72,391	$	68,122	$	314,403
Fixed charges and preferred stock dividends		449			1,941			1,768			2,435		11,629		16,689
Noncontrolling interests in pre-tax income		(266	)		(676	)		(1,159	)		—		—		—
Total earnings	$	25,766		$	108,834		$	82,789		$	74,826	$	79,751	$	331,092
Fixed charges and preferred stock dividends
Interest expensed	$	3		$	23		$	75		$	753	$	2,475	$	1,824
Estimate of interest within rental expense		446			1,918			1,693			1,682		1,356		1,058
Preferred stock dividend requirement		—			—			—			—		7,798		13,807
Total fixed charges and preferred stock dividends	$	449		$	1,941		$	1,768		$	2,435	$	11,629	$	16,689
Ratio of earnings to fixed charges and preferred stock dividends		57.39			56.07			46.83			30.73		6.86		19.84