Masimo (MASI) 10-Q 2013 Q1 Quarterly report

Exhibit 12.1

Masimo Corporation

Ratio of Earnings to Fixed Charges

(dollars in thousands)

	Three months ended March 30, 2013		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	$	20,815	$	83,821	$	86,531		$	107,569		$	82,180		$	72,391
Fixed charges		662		2,514		1,910			1,941			1,768			2,435
Noncontrolling interests’ pre-tax (income) loss		338		744		(58	)		(676	)		(1,159	)		—
Total earnings	$	21,815	$	87,079	$	88,383		$	108,834		$	82,789		$	74,826
Fixed charges
Interest expensed	$	22	$	44	$	116		$	23		$	75		$	753
Estimate of interest within rental expense		640		2,470		1,794			1,918			1,693			1,682
Total fixed charges	$	662	$	2,514	$	1,910		$	1,941		$	1,768		$	2,435
Ratio of earnings to fixed charges		32.95		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.