EXHIBIT 11.0 KIRBY CORPORATION AND CONSOLIDATED SUBSIDIARIES COMPUTATION OF EARNINGS PER COMMON SHARE Three months ended March 31, 1994 1993 ($ in thousands, except per share amount) Primary: Net earnings $ 2,897 3,845 ------- ------ ------- ------ Fully Diluted: Net earnings $ 2,897 3,845 Elimination of interest expense applicable to $50 million of 7 1/4% convertible subordinated debentures, net of tax -- 598 ------- ------ Net earnings $ 2,897 4,443 ------- ------ ------- ------ Primary shares: Weighted average number of common shares outstanding 28,382 22,801 Common equivalent shares for dilutive effect of assumed exercise of stock options 315 251 ------- ------ 28,697 23,052 ------- ------ ------- ------ Fully diluted shares: Weighted average number of common shares outstanding 28,382 22,801 Common equivalent shares for dilutive effect of assumed exercise of stock options 305 257 Shares applicable to $50 million of 7-1/4% convertible subordinated debentures, converted at $11.125 -- 4,494 ------- ------ 28,687 27,552 ------- ------ ------- ------ Earnings per share of common stock: Primary $ .10 .17 Fully diluted $ .10 .16