EXHIBIT 11.1 CASTLE ENERGY CORPORATION STATEMENT OF COMPUTATION OF EARNINGS PER SHARE (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS) (UNAUDITED) THREE MONTHS ENDED DECEMBER 31, ------------------------------------------------------- 2005 2004 ------------------------- ------------------------- BASIC DILUTED BASIC DILUTED ---------- ---------- ---------- ---------- I. Shares Outstanding, Net of Treasury Stock Purchased During the Period: Stock, net 7,262,340 7,262,340 6,892,389 6,892,389 ---------- ---------- ---------- ---------- Purchase of treasury stock (weighted) 7,262,340 7,262,340 6,892,389 6,892,389 II. Weighted Equivalent Shares: Assumed options and warrants exercised 222,481 ---------- ---------- ---------- ---------- III. Weighted Average Shares and Equivalent Shares 7,262,340 7,262,340 6,892,389 7,114,870 ========== ========== ========== ========== IV. Net Income (Loss) $ (125) $ (125) $ 343 $ 343 ========== ========== ========== ========== V. Net Income (Loss) Per Share ($.02) ($.02) $.05 $.05 ========== ========== ========== ==========