EXHIBIT 12a UNITED RENTALS (NORTH AMERICA), INC. STATEMENT OF COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES Year Ended December 31 ------------------------------------------------------------ 1994 1995 1996 1997 1998 ---- ---- ---- ---- ---- (dollars in thousands) Earnings: Income before provision for income taxes and extraordinary items.................... $26,025 $33,781 $38,146 $34,917 $ 86,906 Interest expense.......... 6,245 7,490 11,278 11,847 64,157 Amortization of debt issuance costs........... 27 78 124 1,423 Interest portion of rent expense (1)......... 1,239 1,358 1,514 2,305 6,834 ------- ------- ------- ------- -------- Earnings as adjusted............... $33,509 $42,656 $51,016 $49,193 $159,320 ======= ======= ======= ======= ======== Fixed charges: Interest expense.......... $ 6,245 $ 7,490 $11,278 $11,847 $ 64,157 Amortization of debt issuance costs........... 27 78 124 1,423 Interest portion of rent expense (1)......... 1,239 1,358 1,514 2,305 6,834 ------- ------- ------- ------- ------- Fixed charges........... $ 7,484 $ 8,875 $12,870 $14,276 $ 72,414 ======= ======= ======= ======= ======== Ratio of earnings to fixed charges.............. 4.5x 4.8x 4.0x 3.4x 2.2x - -------- (1) The interest portion of rent expense is estimated to be one-third of rent expense.