Exhibit 12.1

EXHIBIT 12.1 - STATEMENT REGARDING COMPUTATION OF FINANCIAL RATIOS

(in millions except financial ratios, share and per share data)			2018			2017			2016			2015			2014
1. NET INCOME ATTRIBUTABLE TO INNOSPEC INC. AS A PERCENTAGE OF SALES
	A	Net income attributable to Innospec Inc.	$	85.0		$	61.8		$	81.3		$	119.5		$	84.1
	B	Net sales	$	1476.9		$	1306.8		$	883.4		$	1012.3		$	960.9
	A % of B			5.8	%		4.7	%		9.2	%		11.8	%		8.8	%
2. EFFECTIVE TAX RATE AS A PERCENTAGE
	C	Income taxes	$	46.6		$	66.3		$	21.8		$	32.8		$	26.8
	D	Income before income taxes	$	131.6		$	128.1		$	103.1		$	152.3		$	110.9
	C % of D			35.4	%		51.8	%		21.1	%		21.5	%		24.2	%
3. CURRENT RATIO
	E	Current assets	$	663.9		$	561.5		$	441.1		$	458.7		$	414.2
	F	Current liabilities	$	296.6		$	261.5		$	183.1		$	206.1		$	222.9
	Ratio of E to F			2.2			2.1			2.4			2.2			1.9
4. EARNINGS PER SHARE ATTRIBUTABLE TO INNOSPEC INC.
	G	Net income attributable to Innospec Inc.	$	85.0		$	61.8		$	81.3		$	119.5		$	84.1
	H	Basic shares outstanding		24,401			24,148			23,998			24,107			24,391
	I	Diluted shares outstanding		24,603			24,486			24,442			24,612			24,878
	G/H	Basic earnings per share attributable to Innospec Inc.	$	3.48		$	2.56		$	3.39		$	4.96		$	3.45
	G/I	Diluted earnings per share attributable to Innospec Inc.	$	3.45		$	2.52		$	3.33		$	4.86		$	3.38
	Shares in thousands, earnings per share attributable to Innospec Inc. in dollars.