EXHIBIT 11.1 TRANSPORT CORPORATION OF AMERICA, INC. Computation of Earnings per Common Share THREE MONTHS ENDED SIX MONTHS ENDED JUNE 30, JUNE 30, ------------------------------ ------------------------------ 1998 1997 1998 1997 - ------------------------------------------------------------------------------------------------------------ Net earnings $ 2,214,000 $ 2,074,000 $ 3,514,000 $ 3,062,000 - ------------------------------------------------------------------------------------------------------------ Average number of common shares outstanding 6,712,746 6,590,141 6,691,223 6,552,883 Dilutive effect of outstanding stock options and warrants 72,454 138,293 85,212 179,248 - ------------------------------------------------------------------------------------------------------------ Average number of common and common equivalent shares outstanding 6,785,200 6,728,434 6,776,435 6,732,131 - ------------------------------------------------------------------------------------------------------------ Basic earnings per share $ 0.33 $ 0.31 $ 0.53 $ 0.47 Diluted earnings per share $ 0.33 $ 0.31 $ 0.52 $ 0.45