Masimo (MASI) 10-Q 2010 Q3 Quarterly report

Exhibit 12.1

Masimo Corporation

Ratio of Earnings to Fixed Charges

(dollars in thousands)

	Nine Months Ended October 2, 2010		Fiscal Year Ended
			January 2, 2010			January 3, 2009		December 29, 2007		December 31, 2006			December 31, 2005
Ratio of earnings to fixed charges:
Income before provision for income taxes	$	85,826	$	82,180		$	72,391	$	68,122	$	314,403		$	7,369
Fixed charges		1,446		1,768			2,435		3,831		2,882			2,327
Noncontrolling interests in pre-tax (income) loss		642		(1,159	)		—		—		—			—
Total earnings	$	87,914	$	82,789		$	74,826	$	71,953	$	317,285		$	9,696
Fixed charges
Interest expensed	$	19	$	75		$	753	$	2,475	$	1,824		$	1,851
Estimate of interest within rental expense		1,427		1,693			1,682		1,356		1,058			476
Total fixed charges	$	1,446	$	1,768		$	2,435	$	3,831	$	2,882		$	2,327
Ratio of earnings to fixed charges		60.80		46.83			30.73		18.78		110.09			4.17
Ratio of earnings to fixed charges and preferred stock dividends:
Income before provision for income taxes	$	85,826	$	82,180		$	72,391	$	68,122	$	314,403		$	7,369
Fixed charges and preferred stock dividends		1,446		1,768			2,435		11,629		16,689			10,605
Noncontrolling interests in pre-tax (income) loss		642		(1,159	)		—		—		—			—
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Total earnings	$	87,914	$	82,789		$	74,826	$	79,751	$	331,092		$	17,974
Fixed charges and preferred stock dividends
Interest expensed	$	19	$	75		$	753	$	2,475	$	1,824		$	1,851
Estimate of interest within rental expense		1,427		1,693			1,682		1,356		1,058			476
Preferred stock dividend requirement		—		—			—		7,798		13,807			8,278
Total fixed charges and preferred stock dividends	$	1,446	$	1,768		$	2,435	$	11,629	$	16,689		$	10,605
Ratio of earnings to fixed charges and preferred stock dividends		60.80		46.83			30.73		6.86		19.84			1.69