Exhibit 11.1 UNITIL CORPORATION Computation in Support of Earnings per Share Year Ended December 31, --------------------------------------- 2002 2001 2000 --------------------------------------- (000's omitted) BASIC EARNINGS PER SHARE Net Income before Extraordinary Item $ 6,088 $ 5,027 $ 7,216 Extraordinary Item, net --- (3,937) ---- --------------------------------------- Net Income 6,088 1,090 7,216 Less: Dividend Requirements on Preferred Stock 253 257 263 --------------------------------------- Net Income Applicable to Common Stock $ 5,835 $ 833 $ 6,953 --------------------------------------- Average Number of Common Shares Outstanding 4,744 4,744 4,723 --------------------------------------- Basic Earnings per Average Common Shares Outstanding $ 1.23 $ 0.18 $ 1.47 --------------------------------------- DILUTED EARNINGS PER SHARE Net Income before Extraordinary Item $ 6,088 $ 5,027 $ 7,216 Extraordinary Item, net --- (3,937) ---- --------------------------------------- Net Income 6,088 1,090 7,216 Less: Dividend Requirements on Preferred Stock 253 257 263 --------------------------------------- Net Income Applicable to Common Stock $ 5,835 $ 833 $ 6,953 --------------------------------------- Average Number of Common Shares Outstanding plus Assumed Options converted* 4,762 4,760 4,743 --------------------------------------- Basic Earnings per Average Common Shares Outstanding $ 1.23 $ 0.18 $ 1.47 --------------------------------------- * Assumes all options were converted to common shares per SFAS 128.