Potash Corporation of Saskatchewan (POT) 10-Q 2011 Q3 Quarterly report

Exhibit 11

POTASH CORPORATION OF SASKATCHEWAN INC.

COMPUTATION OF PER SHARE EARNINGS

FOR THE NINE MONTHS ENDED SEPTEMBER 30

	2011		2010
A Net income as reported, IFRS ($ millions)		2,398		1,267
B Items adjusting net income ($ millions)		38		(5	)
C Net income, US GAAP ($ millions)		2,436		1,262
D Weighted average number of shares outstanding		855,024,000		889,475,000
E Net additional shares issuable for diluted earnings per share calculation (IFRS)		21,820,000		24,973,000
F Net additional shares issuable for diluted earnings per share calculation (US GAAP)		21,600,000		24,934,000
IFRS
Basic earnings per share (A/D)(1)		2.80		1.43
Diluted earnings per share (A/(D+E))(1)		2.73		1.39
UNITED STATES GAAP
Basic earnings per share (C/D)		2.85		1.42
Diluted earnings per share (C/(D+F))		2.78		1.38

⁽¹⁾  Net income per share calculations are based on dollar and share amounts each rounded to the nearest thousand