1 EXHIBIT 12 RURAL/METRO CORPORATION COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES Six months ended Year ended June 30, December 31, -------------------------------------------------- ----------------- 1993 1994 1995 1996 1997 1996 1997 -------------------------------------------------- ----------------- Income from continuing operations before Income taxes and extraordinary item $4,156 $ 7,610 $12,881 $19,556 $22,084 $11,984 $17,006 ADD Portion of rents representative of the interest factor 818 841 1,334 1,782 2,208 1,120 1,627 Interest on indebtedness 2,896 1,780 3,059 5,108 5,720 2,430 5,409 Amortization of debt expenses and premium 55 141 259 332 162 188 Income as adjusted 7,870 10,286 17,415 26,705 30,344 15,696 24,230 FIXED CHARGES Interest on indebtedness 2,896 1,780 3,059 5,108 6,097 2,489 5,849 Amortization of debt expense and premium 55 141 259 332 162 188 Portion of rents representative of the interest factor 818 841 1,334 1,782 2,208 1,120 1,627 Fixed charges 3,714 2,676 4,534 7,149 8,637 3,771 7,664 Ratio of earnings to fixed charges 2.1 3.8 3.8 3.7 3.5 4.2 3.2