EXHIBIT 12a UNITED RENTALS (NORTH AMERICA), INC. STATEMENT OF COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES Year Ended December 31 ----------------------------------------------------------- Three Months Ended 1994 1995 1996 1997 1998 March 31, 1999 ---- ---- ---- ---- ---- -------------- (dollars in thousands) Earnings: Income before provision for income taxes and extraordinary items.................... $26,025 $33,781 $38,146 $34,917 $ 86,906 $ 33,058 Interest expense.......... 6,245 7,490 11,278 11,847 64,157 24,373 Amortization of debt issuance costs........... 27 78 124 1,423 890 Interest portion of rent expense (1)......... 1,239 1,358 1,514 2,305 6,834 5,427 ------- ------- ------- ------- -------- -------- Earnings as adjusted............... $33,509 $42,656 $51,016 $49,193 $159,320 $ 63,748 ======= ======= ======= ======= ======== ======== Fixed charges: Interest expense.......... $ 6,245 $ 7,490 $11,278 $11,847 $ 64,157 $ 24,373 Amortization of debt issuance costs........... 27 78 124 1,423 890 Interest portion of rent expense (1)......... 1,239 1,358 1,514 2,305 6,834 5,427 ------- ------- ------- ------- ------- ------- Fixed charges........... $ 7,484 $ 8,875 $12,870 $14,276 $ 72,414 $ 30,690 ======= ======= ======= ======= ======== ======== Ratio of earnings to fixed charges.............. 4.5x 4.8x 4.0x 3.4x 2.2x 2.1x - -------- (1) The interest portion of rent expense is estimated to be one-third of rent expense.