Exhibit 12.1

Masimo Corporation

Ratio of Earnings to Fixed Charges

(dollars in thousands)

	Fiscal Year Ended
	December 29, 2012		December 31, 2011			January 1, 2011			January 2, 2010			January 3, 2009
Ratio of earnings to fixed charges:
Income before provision for income taxes	$	83,821	$	86,531		$	107,569		$	82,180		$	72,391
Fixed charges		2,514		1,910			1,941			1,768			2,435
Noncontrolling interests in pre-tax (income) loss		744		(58	)		(676	)		(1,159	)		—
Total earnings	$	87,079	$	88,383		$	108,834		$	82,789		$	74,826
Fixed charges
Interest expensed	$	44	$	116		$	23		$	75		$	753
Estimate of interest within rental expense		2,470		1,794			1,918			1,693			1,682
Total fixed charges	$	2,514	$	1,910		$	1,941		$	1,768		$	2,435
Ratio of earnings to fixed charges		34.64		46.27			56.07			46.83			30.73

In the periods presented, there were no shares of preferred stock outstanding and no dividends paid on preferred stock. Therefore, the ratios of earnings to fixed charges and preferred stock dividends are not different from the ratios of earnings to fixed charges.