EXHIBIT 12 MINNESOTA MINING AND MANUFACTURING COMPANY AND SUBSIDIARIES CALCULATION OF THE RATIO OF EARNINGS TO FIXED CHARGES (Dollars in millions) (Unaudited)

Six Months Ended June 30, Year Year Year Year Year 2000 1999 1998 1997 1996 1995 ------- ------- ------- ------- ------- ------- EARNINGS Income from continuing operations before income taxes, minority interest and extraordinary loss* $1,552 $2,880 $1,952 $3,440 $2,479 $2,168 Add: Interest expense 64 109 139 94 79 102 Interest component of the ESOP benefit expense 10 21 29 32 34 37 Portion of rent under operating leases representative of the interest component 19 37 41 41 46 51 Less: Equity in undistributed income of 20-50% owned companies 3 4 4 3 -- 1 ------ ------- ------- ------- ------- ------- TOTAL EARNINGS AVAILABLE FOR FIXED CHARGES $1,642 $3,043 $2,157 $3,604 $2,638 $2,357 ====== ====== ====== ====== ====== ====== FIXED CHARGES Interest on debt 69 109 139 94 79 102 Interest component of the ESOP benefit expense 10 21 29 32 34 37 Portion of rent under operating leases representative of the interest component 19 37 41 41 46 51 ------ ------ ------ ------ ------ ------ TOTAL FIXED CHARGES $ 98 $ 167 $ 209 $ 167 $ 159 $ 190 ====== ====== ====== ====== ====== ====== RATIO OF EARNINGS TO FIXED CHARGES 16.76 18.22 10.32 21.58 16.59 12.41 *2000 and 1999 include non-recurring pre-tax net gains of $50 million and $100 million, respectively; 1998 includes a pre-tax restructuring charge of $493 million; 1997 includes a pre-tax gain on the sale of National Advertising Company of $803 million.